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  1. #1
    Warning:Annoying to jerks RaleighSport's Avatar
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    Sekai Bicycle Database


    A typical example of a late 70's Sekai 2700.


    Sekai Bicycles:was bought out in 1983 by Norco, Production of Sekai Bicycles stopped in 1990 completely.

    The goal:
    I'm going to attempt to put as much information as possible about Sekai bikes here in this thread, if you have something to add or correct etc please chime in.

    The Information:

    Backstory for the company

    Article on History/Value in current market

    Models Produced

    Catalogs/Brochures etc.

    Decals

    Dating by serial

    Known Serials

    Credits and thanks for links/info: T-Mar as can be seen throughout this thread, yellowjersey cyclery, retrobike.co, classicrendezvous.com, Don Gillies,re-cycle.com, sekaibmx.wordpress.com and anyone who posted in this thread or PMed me more info..
    Last edited by RaleighSport; 10-18-13 at 08:44 AM. Reason: updating
    “Let me never fall into the vulgar mistake of dreaming that I am persecuted whenever I am contradicted.”


    ― Ralph Waldo Emerson, Emerson in His Journals

  2. #2
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    do you only want road bike sekai info?
    Even a turkey can fly in a hurricane

  3. #3
    Warning:Annoying to jerks RaleighSport's Avatar
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    Models Produced:

    "The higher the model number, the better the bike was the general rule. You will find though, that you'd be better off referring to this listing below and drawing your own conclusion. (They are not listed by quality, but rather model number, although the general rule applies). Most frames used Tange tubing.

    120 Commutor
    (3 speed - incorrect spelling per Sekai literature, not sure if intentiontial)

    150 Cummutor
    (5 speed)*

    175 Folding
    (3 speed) 16 inch wheels,

    350 Superhawk
    (Tubing 4130)

    360 (1980 model)“Firefox”
    Champion 4130 Cro-Moly 3 Main tubes, 4.6lbs, Chrome Plated. Tange #500W Cro-Moly Fork, Chrome Plated. Takagi One-Piece Crank with a 5-pin Spider and Alloy Ring UKAI “72″ Alloy Rims. Suzue BMX Hubs, Silver. Kashimax Turbo Saddle. 25 lbs Total

    380 Viper
    (Mild Steel/Hi-Ten)

    400 –
    Tange, high carbon, plain gauge tubing; 26.0mm seat post; cottered cranks, Dia-Compe center-pull brakes; Shimano Lark (rear) and Thunderbird (front) derailleurs with stem shifters. This is on par or just above your run of the mill department store bargain buy.

    410
    Steel rims, cottered cranks, stem shifters, turkey levers (Unconfirmed but highly likely)

    500
    - Tange, high carbon, plain gauge tubing; 26.0mm seat post; alloy cranks; SunTour Honor (rear) and Spirt (front) derailleurs; Dia-Compe center-pull brakes.

    750 Saquatch
    (MTB)Tange No. 5 Cro-Moly Butted Tubes ,Sun Tour shifter, Front and Back DR Suntour Mountech, Crank Sugino, 18 speed, Dia-Compe Brakes, Araya 26 X 1.75 rims

    1000 Sprint
    (early 80s) - Tange, hi-tensile, single butted tubing; 26.2mm seat post; SunTour Seven derailleur, alloy bars and stem.

    1000 Royal

    1400 Magnus GT

    1500
    Tange High Carbon Standard Gauge tubing, Sugino Cranks, Front derailer: Suntour 7, Rear derailer: Suntour 7 GT,Shifters: Suntour stem friction, Brakes: Dia-Compe Center Pull, Handlebars: SR (Sakae) 'North Road' mustache-like bars, Stem: SR (Sakae)

    2000 Super SX
    (early 80s) - Tange frame, Tange Hi Ten fork, Tange headset, Sugino Gt cranks, SunTour VgT (rear) derailleur, SunTour (front) derailleur, SunTour Perfect 6-speed freewheel, Dia-Compe side-pull brakes, 27 x 1 ¼” Araya alloy rims, Suzue rear hub, SR stem.

    1978 Sekai Limited 2400
    , 62cm, 10 speed (2x5). Tange high tensile steel butted tubes throughout. Upgrades: 42cm bar, bar end shifters, newer wheels. (I have the original shifters and wheels if you want them instead.) Comes with pedals. Good condition. No shifter or water bottle bosses on the frame.

    2400 (1981)
    Sugino Bottom Bracket, V-GT luxe RD, Super Maxy crankset, Suntour DT shifters, tange 1 fork, 27 inch araya aluminum rims.

    2400(1985)
    Tange #2 Frame, suntour adjustable dropouts, suntour ARX derailers, suntour barcon shifters, 27 inch araya aluminum rims.

    2500 Grandtour Frame;
    Tange Champion #2
    FD/RD; Suntour ARX w/clamp on DT shifters
    Crankset; Sugino GT w/add on triple
    Wheels; Suzue hubs/Araya rims

    2600: 1985
    was a club racer that sold for $325. The main triangle is Tange 900, which was a seamed, butted CrMo tubeset. Forks and stays are slightly downgraded with Tange Mangaloy. Angles are typical club racing for the era, with a 73 head and 72.5 seat. Wheelbase is spec'd 39.9", 16.4" chainstays, 1.9" rake, 22.6" top tube. Quoted figures are for a 23" frame.

    2600 (1987 model)
    Tange Infinity Tubing, Mangalloy Fork, 105 components and gold araya rims. Nitto bars and stem.

    2700 Examples:
    Sekai 2700 Gt Deluxe
    Color; Blue
    Frame; Tange Double Butted/Hi-Ten throughout
    FD/RD; Suntour Cyclone w/banded DT shifters
    Crankset; Sugino Mighty Tour w/Sugino BB
    Wheels; Shimano hubs/Araya rims

    Sekai 2700 Gt Deluxe
    Color; Tan
    Frame; Tange Champion..........decal does not designate any number, Pro, etc.
    FD/RD; Suntour Vx w/Suntour barend shifters
    Crankset; Sugino Mighty Tour w/Sugino BB
    Wheels; Shimano hubs/Araya rims

    2750 (MTB)

    3000,
    Ac 500 brakes ,Suntour Symmetric shifters, suntour arx derailer, sugino gt cranks
    techmomic stem, nitto olypaid 115 bars, 12 speed Cro Frame.
    1988(Highly likely, but unconfirmed)

    4000 Criterium – (1973)
    Ishiwata tubing possibly until 1975 when Sekai went to mainly Tange.
    Tange Champion #1 Tubing .06x.05 Cr-Moly throughout, Lugs tange short point with cutouts,Shimano SF micro adjusting dropouts, headset tange Falcon,

    5000
    Tange Professional .06 x .03 double butted Cr-Moly, Lugs tange short point with cutouts, Shimano SF micro adjusting dropouts, Headset Tange Levin Extralight competition, seat lug tange allen key seat pin.

    Unnumbered models or unknown numbers
    Sekai Magnum S7
    Norco era
    Tange #2 Cro-Moly
    Chocolate brown paint with a cream head tube
    Top mounted downtube shifters (with a protruding square boss underneath it)
    Two sets of bottle cage bosses on the top and bottom of the downtube
    Nitto stem and Nitto Grand Randonneur drop bars
    Sella Italia saddle
    Dia Comp canti breaks
    SunTour Cyclone M-II drive
    Sugino triple crank (not sure what model)
    Araya 700C wheels (presta valves, 40 spokes)

    Mountaineer (MTB)
    Mountaineer SL (MTB)
    Cherokee (MTB)
    Bush Plot (MTB)
    Everest (MTB)
    Kokanee (MTB)
    Bigfoot (MTB)
    Oswego(possibly MTB)"
    http://www.re-cycle.com/History/sekai.aspx


    Sekai Navigation:

    Backstory for the company

    Article on History/Value in current market

    Catalogs/Brochures etc.

    Decals

    Dating by serial

    Known Serials
    Last edited by RaleighSport; 10-18-13 at 08:45 AM. Reason: Organizing/Cleaning
    “Let me never fall into the vulgar mistake of dreaming that I am persecuted whenever I am contradicted.”


    ― Ralph Waldo Emerson, Emerson in His Journals

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    I have a sekai 1000 from 83, maybe 82. lugged hi-ten frame, it had suntour honor rd. alloy araya rims, not sure about the rest. it's collecting dust in my parents basement, wheel less. I will check other parts next time I am over there.

  5. #5
    Warning:Annoying to jerks RaleighSport's Avatar
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    Dating by serial: A large number of Sekai frames came from Kawamura, thus you may find this of use, if your format doesn't match however do not fret simply refer to the information that follows the Kawamura info.
    Quote Originally Posted by T-Mar View Post
    Kawamura manufactured frames (1972-1987*)

    Serial number format XYZZZZZ where:

    X is a letter indicating the market using the following codes:
    A= Australia
    C = Canada (pre-1985)
    E = Europe
    K = USA (pre 1985)
    W = USA (1985-1987*)

    Y is a letter indicating the last digit of the manufacturing calendar year, where A =1, B = 2, C = 3… J = 0. Exception is letter S, used on all frames prior to 1975.

    ZZZZZ is a five or six digit number, apparently representing a sequential frame manufac turing number for the year (or era in the case of pre 1975 frames)

    Example 1: KA24587 is the 24,787th frame produced in 1981 for the US market.

    Example 2: CG231117 is the 23,117th frame produced in 1977 for the Canadian market.

    Example 3: WE54612 is the 54,612th frame produced in 1985 for the US market.

    * Serial number format may extend beyond 1987, but there are no reported examples, to date.

    http://www.bikeforums.net/showthread...mber-Database?

    70's At least for some Sekais the Y## format and M## one should actually equate ## with the last two digits of their respective year IE. Y77 is 1977, however this does not apply to all Sekai formats.. apparently not even all Mikki or Yamaguchi manufactured frames. Please consult with specs and pictures if you feel your serial is not matching to format.


    80's Yamaguchi/Mikki made Sekai frames refer to the quote from T-mar.

    Quote Originally Posted by T-Mar View Post
    Apparently, Miki made both Sekai and Sakai frames. Sekai frames were manufactured by Miki and assembled by Sakai Export. It not uncommon for a manufacturer to produce more than one brand. The serial number format should be Myfxxxx, where y is a number designating the year and f is a letter designating the fortnight. The same serial number format shows on on some Norco and Centurion models, though it is unclear whether these frames were made by Miki or another manufacturer with the same serial number format. For instance, Merida of Taiwan uses the same format.
    Sekai Navigation:
    Backstory for the company

    Article on History/Value in current market

    Models Produced

    Catalogs/Brochures etc.

    Decals

    Known Serials
    Last edited by RaleighSport; 10-18-13 at 08:45 AM. Reason: Cleaning/Organizing
    “Let me never fall into the vulgar mistake of dreaming that I am persecuted whenever I am contradicted.”


    ― Ralph Waldo Emerson, Emerson in His Journals

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    sure thing. next time i'm up there i'll get the number and snap a couple pics. it's in pretty rough shape. last ridden in 93 with an mtb rear wheel (I busted two rims bunny hopping curbs in college)

  7. #7
    Warning:Annoying to jerks RaleighSport's Avatar
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    http://www.yellowjersey.org/SEKAI75.JPG 1975 catalog at yellow jersey
    http://www.retrobike.co.uk/forum/gal...2_itemId=25384 Very cool set of reviews/specs from '77.
    Last edited by RaleighSport; 10-16-13 at 11:34 AM. Reason: Cleaning/Organizing
    “Let me never fall into the vulgar mistake of dreaming that I am persecuted whenever I am contradicted.”


    ― Ralph Waldo Emerson, Emerson in His Journals

  8. #8
    Warning:Annoying to jerks RaleighSport's Avatar
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    Last edited by RaleighSport; 10-18-13 at 08:45 AM. Reason: Cleaning/Organizing
    “Let me never fall into the vulgar mistake of dreaming that I am persecuted whenever I am contradicted.”


    ― Ralph Waldo Emerson, Emerson in His Journals

  9. #9
    Senior Member Andycapp's Avatar
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    '80 Sekai 2000 Super SX

    Serial Number - Y0F5767

    62cm seat-tube cc

    Tange frame, Tange Hi Ten fork, Tange headset, Sugino SuperMaxy cranks, SunTour 7 derailleurs/shifters, SunTour Perfect 6-speed freewheel, Dia-Compe center-pull brakes, 27 x 1 ¼” Araya alloy rims, Suzue hubs w/Sekai decals, Alps stem and Bars.

    Purchased at Valley Cyclery in Auburn, WA

    This bike was picked up by a friend and given to me in filthy condition. But, it cleaned up pretty nice. I've put on new tires/tubes and tape. (Mite redo this with blue cloth, as I did a pretty poor job. I'm used to using nicer cork tape). I rebuilt the bottom-bracket and tuned the drive-train. Rides nice but its a bit big for me and won't be ridden in favor of my other bikes. I'd like to sell it to someone that could put it to better use. Anyone want to give an appraisal for me or should I re-post in that section?
















  10. #10
    Warning:Annoying to jerks RaleighSport's Avatar
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    Original front page

    Sekai Bicycle Database
    Sekai Bicycles were bought out in 1983 by Norco, Production of Sekai Bicycles stopped in 1990 completely.


    I'm going to attempt to put as much information as possible about Sekai bikes here in this thread, if you have something to add or correct etc please chime in.


    Backstory for the company:
    http://www.classicrendezvous.com/Japan/Sekai_main.htm


    Article on History/Value in current market http://www.ece.ubc.ca/~gillies/sekai..._VALUATION.txt


    Models Produced:


    "The higher the model number, the better the bike was the general rule. You will find though, that you'd be better off referring to this listing below and drawing your own conclusion. (They are not listed by quality, but rather model number, although the general rule applies). Most frames used Tange tubing.


    120 Commutor (3 speed - incorrect spelling per Sekai literature, not sure if intentiontial)


    150 Cummutor (5 speed)*


    175 Folding (3 speed) 16 inch wheels,


    350 Superhawk (Tubing 4130)


    360 (1980 model)“Firefox” Champion 4130 Cro-Moly 3 Main tubes, 4.6lbs, Chrome Plated. Tange #500W Cro-Moly Fork, Chrome Plated. Takagi One-Piece Crank with a 5-pin Spider and Alloy Ring UKAI “72″ Alloy Rims. Suzue BMX Hubs, Silver. Kashimax Turbo Saddle. 25 lbs Total


    380 Viper (Mild Steel/Hi-Ten)


    400 – Tange, high carbon, plain gauge tubing; 26.0mm seat post; cottered cranks, Dia-Compe center-pull brakes; Shimano Lark (rear) and Thunderbird (front) derailleurs with stem shifters. This is on par or just above your run of the mill department store bargain buy.


    410 Steel rims, cottered cranks, stem shifters, turkey levers (Unconfirmed but highly likely)


    500 - Tange, high carbon, plain gauge tubing; 26.0mm seat post; alloy cranks; SunTour Honor (rear) and Spirt (front) derailleurs; Dia-Compe center-pull brakes.


    750 Saquatch (MTB)Tange No. 5 Cro-Moly Butted Tubes ,Sun Tour shifter, Front and Back DR Suntour Mountech, Crank Sugino, 18 speed, Dia-Compe Brakes, Araya 26 X 1.75 rims


    1000 Sprint (early 80s) - Tange, hi-tensile, single butted tubing; 26.2mm seat post; SunTour Seven derailleur, alloy bars and stem.


    1000 Royal


    1400 Magnus GT


    1500 Tange High Carbon Standard Gauge tubing, Sugino Cranks, Front derailer: Suntour 7, Rear derailer: Suntour 7 GT,Shifters: Suntour stem friction, Brakes: Dia-Compe Center Pull, Handlebars: SR (Sakae) 'North Road' mustache-like bars, Stem: SR (Sakae)


    2000 Super SX (early 80s) - Tange frame, Tange Hi Ten fork, Tange headset, Sugino Gt cranks, SunTour VgT (rear) derailleur, SunTour (front) derailleur, SunTour Perfect 6-speed freewheel, Dia-Compe side-pull brakes, 27 x 1 ¼” Araya alloy rims, Suzue rear hub, SR stem.


    1978 Sekai Limited 2400, 62cm, 10 speed (2x5). Tange high tensile steel butted tubes throughout. Upgrades: 42cm bar, bar end shifters, newer wheels. (I have the original shifters and wheels if you want them instead.) Comes with pedals. Good condition. No shifter or water bottle bosses on the frame.


    2400 (1981) Sugino Bottom Bracket, V-GT luxe RD, Super Maxy crankset, Suntour DT shifters, tange 1 fork, 27 inch araya aluminum rims.


    2400(1985) Tange #2 Frame, suntour adjustable dropouts, suntour ARX derailers, suntour barcon shifters, 27 inch araya aluminum rims.


    2500 Grandtour Frame; Tange Champion #2
    FD/RD; Suntour ARX w/clamp on DT shifters
    Crankset; Sugino GT w/add on triple
    Wheels; Suzue hubs/Araya rims


    2600: 1985 was a club racer that sold for $325. The main triangle is Tange 900, which was a seamed, butted CrMo tubeset. Forks and stays are slightly downgraded with Tange Mangaloy. Angles are typical club racing for the era, with a 73 head and 72.5 seat. Wheelbase is spec'd 39.9", 16.4" chainstays, 1.9" rake, 22.6" top tube. Quoted figures are for a 23" frame.


    2600 (1987 model) Tange Infinity Tubing, Mangalloy Fork, 105 components and gold araya rims. Nitto bars and stem.


    2700 Examples:
    Sekai 2700 Gt Deluxe
    Color; Blue
    Frame; Tange Double Butted/Hi-Ten throughout
    FD/RD; Suntour Cyclone w/banded DT shifters
    Crankset; Sugino Mighty Tour w/Sugino BB
    Wheels; Shimano hubs/Araya rims


    Sekai 2700 Gt Deluxe
    Color; Tan
    Frame; Tange Champion..........decal does not designate any number, Pro, etc.
    FD/RD; Suntour Vx w/Suntour barend shifters
    Crankset; Sugino Mighty Tour w/Sugino BB
    Wheels; Shimano hubs/Araya rims


    2750 (MTB)


    3000, Ac 500 brakes ,Suntour Symmetric shifters, suntour arx derailer, sugino gt cranks
    techmomic stem, nitto olypaid 115 bars, 12 speed Cro Frame.
    1988(Highly likely, but unconfirmed)


    4000 Criterium – (1973) Ishiwata tubing possibly until 1975 when Sekai went to mainly Tange.
    Tange Champion #1 Tubing .06x.05 Cr-Moly throughout, Lugs tange short point with cutouts,Shimano SF micro adjusting dropouts, headset tange Falcon,


    5000 Tange Professional .06 x .03 double butted Cr-Moly, Lugs tange short point with cutouts, Shimano SF micro adjusting dropouts, Headset Tange Levin Extralight competition, seat lug tange allen key seat pin.


    Unnumbered models or unknown numbers
    Sekai Magnum S7
    Norco era
    Tange #2 Cro-Moly
    Chocolate brown paint with a cream head tube
    Top mounted downtube shifters (with a protruding square boss underneath it)
    Two sets of bottle cage bosses on the top and bottom of the downtube
    Nitto stem and Nitto Grand Randonneur drop bars
    Sella Italia saddle
    Dia Comp canti breaks
    SunTour Cyclone M-II drive
    Sugino triple crank (not sure what model)
    Araya 700C wheels (presta valves, 40 spokes)


    Mountaineer (MTB)
    Mountaineer SL (MTB)
    Cherokee (MTB)
    Bush Plot (MTB)
    Everest (MTB)
    Kokanee (MTB)
    Bigfoot (MTB)
    Oswego(possibly MTB)"
    http://www.re-cycle.com/History/sekai.aspx


    Catalogs/Brochures etc.
    http://www.yellowjersey.org/SEKAI75.JPG 1975 catalog at yellow jersey
    http://www.retrobike.co.uk/forum/gal...2_itemId=25384 Very cool set of reviews/specs from '77.


    Decals Available:
    http://www.yellowjersey.org/sekai.html


    Dating by serial: A large number of Sekai frames came from Kawamura, thus you may find this of use, if your format doesn't match however do not fret.
    http://www.bikeforums.net/showthread...mber-Database
    80's Yamaguchi/Mikki made Sekai frames
    Quote Originally Posted by T-Mar View Post
    Apparently, Miki made both Sekai and Sakai frames. Sekai frames were manufactured by Miki and assembled by Sakai Export. It not uncommon for a manufacturer to produce more than one brand. The serial number format should be Myfxxxx, where y is a number designating the year and f is a letter designating the fortnight. The same serial number format shows on on some Norco and Centurion models, though it is unclear whether these frames were made by Miki or another manufacturer with the same serial number format. For instance, Merida of Taiwan uses the same format.
    Credits and thanks for links/info: T-Mar as can be seen throughout this thread, yellowjersey cyclery, retrobike.co, classicrendezvous.com, Don Gillies,re-cycle.com, sekaibmx.wordpress.com and anyone who posted in this thread or PMed me more info..
    Last edited by RaleighSport; 10-16-13 at 10:22 AM. Reason: updating
    Last edited by RaleighSport; 10-16-13 at 12:18 PM.
    “Let me never fall into the vulgar mistake of dreaming that I am persecuted whenever I am contradicted.”


    ― Ralph Waldo Emerson, Emerson in His Journals

  11. #11

  12. #12
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    I just read the OP's article. Sekai continued to be available through Norco until 1990, not 1986. The actual takeover by Norco occured during 1983, for the 1984 model year. The quality did not suffer under Norco and Norco bicycles are not equivalent to Huffy. They are much better. Just search the forum and look at some of the Norco models. Norco did do some consolidation of their brands and the higher end Sekai models do appear to have been dropped, but both entry level and mid-range models were still available. Component selection was comparable to the competition at the various price levels.

  13. #13
    Warning:Annoying to jerks RaleighSport's Avatar
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    Quote Originally Posted by T-Mar View Post
    I just read the OP's article. Sekai continued to be available through Norco until 1990, not 1986. The actual takeover by Norco occured during 1983, for the 1984 model year. The quality did not suffer under Norco and Norco bicycles are not equivalent to Huffy. They are much better. Just search the forum and look at some of the Norco models. Norco did do some consolidation of their brands and the higher end Sekai models do appear to have been dropped, but both entry level and mid-range models were still available. Component selection was comparable to the competition at the various price levels.
    You are correct on the date they closed shop/the take over/and the quality as well as far as I know some people even collect Norco's... I found the model to pricing info interesting and a great story about someone who loves the brand.
    Edit: T-Mar putting those two years at the top of this thread to solve later confusion.
    Last edited by RaleighSport; 12-15-11 at 12:08 PM.
    “Let me never fall into the vulgar mistake of dreaming that I am persecuted whenever I am contradicted.”


    ― Ralph Waldo Emerson, Emerson in His Journals

  14. #14
    Warning:Annoying to jerks RaleighSport's Avatar
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    Quote Originally Posted by Chuckk View Post
    Does anybody have an explanation for the extreme stay deflection in the chart on this page?
    I had a beautiful 4000, but it absolutely ate up effort, and I finally sold it when it dumped me hard on a hill.
    The 4000 was labeled as Tange Champion tube.


    Sorry I don't have an answer for ya >.> but I myself am hunting a 4000, since a 5000 would simply be wall art! I can hazard a probably incorrect guess though as to the stay deflection, because the tubing was so light and thin they had to go so extreme, as is referenced often you could literally pinch the tubing out of shape with your bare fingers.
    “Let me never fall into the vulgar mistake of dreaming that I am persecuted whenever I am contradicted.”


    ― Ralph Waldo Emerson, Emerson in His Journals

  15. #15
    Senior Member GrayJay's Avatar
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    Deflection probably due to long chainstays, most of the other bikes on this list are more racey, likely have shorter chainstays. I wouldnt expect that a sekai would have partucularly thin-walled chainstays which would be the other reason for high deflection.

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    Quote Originally Posted by Chuckk View Post
    Does anybody have an explanation for the extreme stay deflection in the chart on this page?
    There are a number of factors which could affect this measurement but the major factor is the thickness of the tubing used for the stays. The tested model is the Sekai 5000, their top line racing model. Given the tubeset, the results are predictable. It used very thin, 0.5mm stays. For comparison Columbus SL used 0.7mm stays (40% thicker).

  17. #17
    Senior Member GrayJay's Avatar
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    Quote Originally Posted by T-Mar View Post
    There are a number of factors which could affect this measurement but the major factor is the thickness of the tubing used for the stays. The tested model is the Sekai 5000, their top line racing model. Given the tubeset, the results are predictable. It used very thin, 0.5mm stays. For comparison Columbus SL used 0.7mm stays (40% thicker).
    Interesting, I knew that sekai made plenty of hi-ten bikes, didnt realize they had a high-end model. I would imagine that an intact 5000 is a very, very rare frame these days! Scan of full '77 review at;
    http://www.retrobike.co.uk/gallery2/...2_itemId=25384
    Arcticle quotes a 4.5lbs frame weight. For a frame alone, that is not spectacularly weenie light, wonder if that included the fork weight putting the frame weight down near 3 lbs, just a bit more than todays lightest S3 steel frames.

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    Warning:Annoying to jerks RaleighSport's Avatar
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    Quote Originally Posted by GrayJay View Post
    Interesting, I knew that sekai made plenty of hi-ten bikes, didnt realize they had a high-end model. I would imagine that an intact 5000 is a very, very rare frame these days! Scan of full '77 review at;
    http://www.retrobike.co.uk/gallery2/...2_itemId=25384
    Arcticle quotes a 4.5lbs frame weight. For a frame alone, that is not spectacularly weenie light, wonder if that included the fork weight putting the frame weight down near 3 lbs, just a bit more than todays lightest S3 steel frames.
    If I remember correctly, that is the weight of the fork frame and headset together.
    Last edited by RaleighSport; 12-16-11 at 12:49 PM.
    “Let me never fall into the vulgar mistake of dreaming that I am persecuted whenever I am contradicted.”


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    Senior Member 3speedslow's Avatar
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    Heyeverybody,

    As this thread concerns Sekai bikes, I thought I would just throw this out to anybody interested. The early 60's Raleigh Gran Sport I just got came with a Sekai stickered, suzue QR high flange hub laced to a 27 steel Araya wheel that I don't want. It looks to be in good shape.I am trying to find the original one Dunlop lightweight with racelite hub to replace it. When I do, anybody that wants the Sekai can have it for shipping cost. Might not be much of an offer, but depending on where you are and how much original parts mean to you, it might.

    Thanks for reading, let me know 3 SS

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    Senior Member r0ckh0und's Avatar
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    I picked up another Sekai bicycle this morning. It is the sixth one that I have owned, unfortunately I have yet to get my hands on a 54cm. I am adding the info I have on the 3 that are still with me.

    Sekai 2700 Gt Deluxe
    Color; Blue
    Frame; Tange Double Butted/Hi-Ten throughout
    FD/RD; Suntour Cyclone w/banded DT shifters
    Crankset; Sugino Mighty Tour w/Sugino BB
    Wheels; Shimano hubs/Araya rims
    Serial # on BB; 7E90194


    Sekai 2700 Gt Deluxe
    Color; Tan or Gold
    Frame; Tange Champion..........decal does not designate any number, Pro, etc.
    FD/RD; Suntour Vx w/Suntour barend shifters
    Crankset; Sugino Mighty Tour w/Sugino BB
    Wheels; Shimano hubs/Araya rims
    Serial # on BB; YOF9590
    The original owner of this bike had a 2500 that was stolen, so he went out and bought this one to replace it. His recollection was around 1980 in Oregeon. Therefore I'm guessing this was built in '79 or '80. Oh.......and he also claimed to have paid around $500 for it.


    Sekai 2500 Grandtour
    Color; Dark Grey w/Red HT and partial ST
    Frame; Tange Champion #2
    FD/RD; Suntour ARX w/clamp on DT shifters
    Crankset; Sugino GT w/add on triple
    Wheels; Suzue hubs/Araya rims
    Serial # on BB; Y3B2318


    Two of the others I had were the 1000 and the 500........both with low end components, steel rims etc. and the third I don't have much recollection of.......
    Last edited by r0ckh0und; 12-20-11 at 08:38 AM.
    "Stay thirsty my friends"

    "Give a man a beer and he wastes an hour. Teach a man to brew and he wastes a lifetime."

    http://plainoldsteel.blogspot.com/

    '79/'80 Sekai 2700, Early 70's PX-10, '90/'91 Club Fuji, '83 Miyata 610, '70ish Zeus Gran Sport, '88 Centurion Ironman Master, '89 Bridgestone RB1, '99/'00 Gunnar Rockhound, '99 Surly Cross Check, '09 Surly Cross Check,

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    Warning:Annoying to jerks RaleighSport's Avatar
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    Quote Originally Posted by r0ckh0und View Post
    I picked up another Sekai bicycle this morning. It is the sixth one that I have owned, unfortunately I have yet to get my hands on a 54cm. I am adding the info I have on the 3 that are still with me.

    Sekai 2700 Gt Deluxe
    Color; Blue
    Frame; Tange Double Butted/Hi-Ten throughout
    FD/RD; Suntour Cyclone w/banded DT shifters
    Crankset; Sugino Mighty Tour w/Sugino BB
    Wheels; Shimano hubs/Araya rims
    Serial # on BB; 7E90194


    Sekai 2700 Gt Deluxe
    Color; Tan
    Frame; Tange Champion..........decal does not designate any number, Pro, etc.
    FD/RD; Suntour Vx w/Suntour barend shifters
    Crankset; Sugino Mighty Tour w/Sugino BB
    Wheels; Shimano hubs/Araya rims
    Serial # on BB; YOF9590

    Sekai 2500 Grandtour
    Color; Dark Grey w/Red HT and partial ST
    Frame; Tange Champion #2
    FD/RD; Suntour ARX w/clamp on DT shifters
    Crankset; Sugino GT triple
    Wheels; Suzue hubs/Araya rims
    Serial # on BB; Y3B2318


    Two of the others I had were the 1000 and the 500........both with low end components, steel rims etc. and the third I don't have much recollection of.......
    Thanks for the specs and background! And you also actually fixed a problem that has been nagging me, my "2500" never seemed specced right, I'd often wondered if it was a lower model but it matches with your tan 2700.. only mine's gold.. and I suspect you won't find a 54cm one.. mines 53.
    “Let me never fall into the vulgar mistake of dreaming that I am persecuted whenever I am contradicted.”


    ― Ralph Waldo Emerson, Emerson in His Journals

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    Senior Member r0ckh0und's Avatar
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    Perhaps my tan 2700 is considered to be gold. Decal lettering is blue w/white outline. There is a noticable weight difference between the gold 2700 and the Grey/Red 2500. They are spec'd out a
    little differently and both are 58cm but I would be interested to know the difference between the Tange Champion and the Tange Champion #2

    A 53cm would be fine with me.........and actually, I think the blue 2700 is a 53cm but has the telltale paint cracks behind the HT lugs on top of the TT and under the DT and therefore has become a donor.
    "Stay thirsty my friends"

    "Give a man a beer and he wastes an hour. Teach a man to brew and he wastes a lifetime."

    http://plainoldsteel.blogspot.com/

    '79/'80 Sekai 2700, Early 70's PX-10, '90/'91 Club Fuji, '83 Miyata 610, '70ish Zeus Gran Sport, '88 Centurion Ironman Master, '89 Bridgestone RB1, '99/'00 Gunnar Rockhound, '99 Surly Cross Check, '09 Surly Cross Check,

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    Warning:Annoying to jerks RaleighSport's Avatar
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    I'm curious now about the tan, I can see how the gold could be seen that way, I know when I bring it inside it's definitely more of a dull silver..does yours seem to change color depending on the light? I happen to have a 2500 as well(confirmed) and I really hope the paint isn't stock, it's this weird metallic dark blueish color.. but lots of things bug me about that bike, like the braze on cable stops...
    “Let me never fall into the vulgar mistake of dreaming that I am persecuted whenever I am contradicted.”


    ― Ralph Waldo Emerson, Emerson in His Journals

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    Senior Member r0ckh0und's Avatar
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    I scrounged up a few pics.........The silver 1000 I found last year, Tange Champion decal on the gold 2700 and the gold 2700

    It is certainly not a brilliant gold, more of a satin finish I think.
    Attached Images Attached Images
    "Stay thirsty my friends"

    "Give a man a beer and he wastes an hour. Teach a man to brew and he wastes a lifetime."

    http://plainoldsteel.blogspot.com/

    '79/'80 Sekai 2700, Early 70's PX-10, '90/'91 Club Fuji, '83 Miyata 610, '70ish Zeus Gran Sport, '88 Centurion Ironman Master, '89 Bridgestone RB1, '99/'00 Gunnar Rockhound, '99 Surly Cross Check, '09 Surly Cross Check,

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    Warning:Annoying to jerks RaleighSport's Avatar
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    You would have been really handy when I first IDed this bike. Beholdy the 2700 GT Deluxe in gold(or as you call it tan, despite our different lighting camera it seems to be the same paint to my eyes) 53cm, purchased at the dump for 10 bucks as a parts/donor bike for a trashed u-08(that later became a shop stool).

    I might have to beg you to take some detailed sticker pics for me, I've been toying with the idea of redecaling mine.

    Oh and I really should update the pic, that saddle is gone and replaced with a b-17 and almost all that gear is gone other then the helmet.
    “Let me never fall into the vulgar mistake of dreaming that I am persecuted whenever I am contradicted.”


    ― Ralph Waldo Emerson, Emerson in His Journals

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