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Sekai Bicycle Database

Old 02-18-18, 06:46 PM
  #401  
Jonathan Hanson
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This is the original crankset still on my 1977 2500 Grandtour.
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Old 03-01-18, 07:35 PM
  #402  
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Sekai 4000 Serial number

I have a Sekai 4000 Professional which I purchased new as a frameset in 1983. The serial # is M8M 22913. It was black when new, has Shimano SF vertical dropouts, Champion #2 Tubing, Heart cutout lugs, brake bridge diamond reinforcements and a full wraparound seat stay attachment. It had the green Champion tubing sticker. Is this a 1978 Miki produced frame?
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Old 03-02-18, 08:52 AM
  #403  
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Retrofaction, the odds of it not being Miki are negligible, given that Miki was a known manufactrer of these frames and the serial number format is consistent with Miki. Unless you made a mistake on the serial number it was manufactured in 1978.
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Old 05-31-18, 05:43 PM
  #404  
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Picked up a new to me Sekai 2500 Grandtour today! It's pretty crusty, paint is in the worst shape. I road a lower model Sekai throughout college that I saved from a dumpster so excited to fix this one up.

Serial Number is YOL8103.

Says it's Tange Peerless, which I've never heard of.

Last edited by Battles4Seattle; 05-31-18 at 05:52 PM.
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Old 05-31-18, 06:08 PM
  #405  
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The ones I have seen were high ten steel with veey nice components. Seat post OD will tell more, TMar probably knows it regardless

Last edited by wrk101; 05-31-18 at 06:13 PM.
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Old 05-31-18, 06:42 PM
  #406  
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I'm a noob and don't know what Seat post OD means, lol. It has stem Shimano shifters, a rear rack, SunTour VX front and rear derailleurs, Dia-Compe brakes and levers, and a super maxy crank with a 52/40.
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Old 06-01-18, 07:47 AM
  #407  
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Tange Peerless is new to me, too. The serial number indicates it was manufactured in 1980 by Yamaguchi, though it should be a 1981 model. I don't believe there are any in the database from the very early 1980s. The very late 1970s versions used Tange #101, while circa 1983 they were Tange #2 . Consequently, I'm also interested in the clue from the seat post outer diameter, which is typically stamped somewhere below the insertion mark, format 26.x, where x is an even number.
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Old 06-01-18, 08:50 AM
  #408  
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Thanks T-Mar, I found it! The seat post says Max.HT 26.2 and then L-80. The Peerless stamp says high tensile double butted.
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Old 06-01-18, 11:30 AM
  #409  
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Originally Posted by Battles4Seattle View Post
Thanks T-Mar, I found it! The seat post says Max.HT 26.2 and then L-80. The Peerless stamp says high tensile double butted.
The post size is consistent with the double butted hi-tensile set and the post's date code corroborates a 1981 model manufactured in late 1980. It appears that Tange renamed their #101 double butted hi-tensile tubeset. That's good to know. I'd appreciate a picture of the tubeset decal.
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Old 06-01-18, 01:32 PM
  #410  
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I certainly will after I can get to 10 posts, lol!
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Old 06-03-18, 07:00 PM
  #411  
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T-Mar any further thoughts on whether this Miki built frame is a Sekai?
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Old 07-23-18, 03:35 PM
  #412  
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Folks: I am a newbie on this forum. After storing my late brother-in-law's Sekai I am getting it cleaned up to ride and trying to understand what I have. Serial Y0L9353 with a made in Japan sticker. As best I can translate the serial number from this thread it is somewhere in the 1980-85 range. Can anyone help me understand more clearly how to decipher the serial number code?
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Old 07-23-18, 06:20 PM
  #413  
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Originally Posted by highpockets View Post
Folks: I am a newbie on this forum. After storing my late brother-in-law's Sekai I am getting it cleaned up to ride and trying to understand what I have. Serial Y0L9353 with a made in Japan sticker. As best I can translate the serial number from this thread it is somewhere in the 1980-85 range. Can anyone help me understand more clearly how to decipher the serial number code?
Your frame was manufactured in 1980 by Yamaguchi of Japan. It may be late enough in the year to be a 1981 model.
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Old 07-23-18, 07:05 PM
  #414  
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Thanks T-Mar. Just what I was looking for.

Any deciphering? Y0L9353 "Year / ?? / ?? / production count?"

Thanks, Highpockets.
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Old 08-25-18, 08:41 PM
  #415  
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I am in middle of cleaning up my Sekai GT2700 and I believe the seatpost tube diameter that came with is not the right size.
Does anyone know what is the right size of the seatpost?

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Old 11-05-18, 09:01 AM
  #416  
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Hi. may you help me identify my friend's serial number frame
1. located on a straight bottom bracket and there are 2 ellipse holes Y5M85031285 / YSM85031285
and is on the top right head tube E5 E5
and head tube left top down 73 61
then there is a hole holder for the road bike shifters left and right on the frame


example of the shape of a bottom bracket hole

2.there is a straight bottom bracket M23751
there are 3 small round holes forming a triangle. and there are also serials in the drop-out chainstay but I don't know. then the road bike shift holder left and right are bolt pivots
its all have doible bidon

Is this one of the sekai or the other
Please help. Thanks
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Old 01-11-19, 05:56 PM
  #417  
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Hi, I've just picked up a rusty 2500 serial number 365450. I'll post more details later.
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Old 01-12-19, 03:03 AM
  #418  
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Sekai 2500 Grandtour
18 speed
Colour: Dark Red
Frame: 21”.
Front & Rear Derailleur: Suntour Mountech
DT Shifters: Suntour
Crankset: Sugino GT
Chainrings x 3
Pedals: MKS GR8 (Japan)
Hubs: Suzue
Rims: 27” No identifying labels but assumed to be original
Brakes: Dia Compe
Serial No. 365450
Made in Japan sticker

Interestingly the serial number is very close to dougb’s 2500 in post #285. Identical colour & decals so may be part of same batch.
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Old 01-12-19, 08:10 AM
  #419  
T-Mar
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Originally Posted by Burlington View Post
Sekai 2500 Grandtour
18 speed
Colour: Dark Red
Frame: 21”.
Front & Rear Derailleur: Suntour Mountech
DT Shifters: Suntour
Crankset: Sugino GT
Chainrings x 3
Pedals: MKS GR8 (Japan)
Hubs: Suzue
Rims: 27” No identifying labels but assumed to be original
Brakes: Dia Compe
Serial No. 365450
Made in Japan sticker

Interestingly the serial number is very close to dougb’s 2500 in post #285. Identical colour & decals so may be part of same batch.
Based on the Mountech derailleurs and serial number, its likely a 1983 model or a 1984 model manufactured in late 1983.
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Old 01-12-19, 10:53 PM
  #420  
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Thanks T-Mar. Any idea when they finally ceased production on this particular model?
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