Advertise on Bikeforums.net



User Tag List

Page 1 of 2 12 LastLast
Results 1 to 25 of 28

Thread: Triple crank

  1. #1
    Wherever I may roam....
    Join Date
    Oct 2009
    Location
    Topton Pa
    My Bikes
    A few bikes
    Posts
    1,573
    Mentioned
    11 Post(s)
    Tagged
    0 Thread(s)

    Triple crank

    Is a triple crank really needed for a bike that won't be used for any heavy "touring"? I'm paper building at this point my dream bike (separate thread as things progress) and I have most ideas figured out except the cranks. I was thinking something along the lines of TA cranks (like these) http://3.bp.blogspot.com/_C1XrRVl3W8...nk+3+small.jpg
    I'm just not sure if I need a granny gear. Thoughts?
    Emails are quicker.... RobvanI-81@hotmail.com

    ISO: Roberts frame/fork 58cm

  2. #2
    Bianchi Goddess Bianchigirll's Avatar
    Join Date
    Apr 2009
    Location
    Camp Hill, PA
    My Bikes
    Too many to list here check my signature.
    Posts
    20,543
    Mentioned
    46 Post(s)
    Tagged
    1 Thread(s)
    aslong as you are happy with the choice of gearing I don't see why you need a triple. that does look like a big step or step and a half between the rings.


    Last edited by Bianchigirll; 02-03-11 at 08:04 AM.
    Bianchis '87 Sport SX, '90 Proto (2), '91 Boarala 'cross, '93 Project 3, '88 Trofeo SOLd, '86 Volpe, '89 Axis SOLD, '79 Mixte SOLD, '99 Mega Pro XL Ti SOLD, '97 Ti Megatube, , '90 something Vento 603,

    Others but still loved,; '80 RIGI, '80 Batavus Professional, '87 Cornelo, '86 Bertoni (sold), '09 Motobecane SS, '98 Hetchins M.O., '09 K2 Mainframe SOLD, '89 Trek 2000, '?? Jane Doe (still on the drawing board), '90ish Haro Escape

  3. #3
    rhm
    rhm is offline
    multimodal commuter rhm's Avatar
    Join Date
    Nov 2006
    Location
    NJ, NYC, LI
    My Bikes
    1945? Fothergill, 1948 Raleigh Record Ace, 1954 Drysdale, 1963? Claud Butler Olympic Sprint, Lambert 'Clubman', 1972 Fuji Finest, 1983 Trek 720, 1984 Counterpoint Opus II, 1993 Basso Gap, 2010 Downtube 8h, and...
    Posts
    12,640
    Mentioned
    56 Post(s)
    Tagged
    1 Thread(s)
    Play with the gear calculator. I normally calculate everything in gear inches, which is common; I look for a range somewhere around 30 to 90. I'd suggest you figure out what gear range you need, and build your bike to suit that. Whether that means a double or triple crank does not, I think, really matter.

  4. #4
    Wherever I may roam....
    Join Date
    Oct 2009
    Location
    Topton Pa
    My Bikes
    A few bikes
    Posts
    1,573
    Mentioned
    11 Post(s)
    Tagged
    0 Thread(s)
    Thanks guys and girls for your input. I'm not planning on buying the VO cranks (although they are nice) because I am trying to keep this on a budget. A friend of mine has a machine shop in his garage and I think it would be quite cool to have my name on the crank arms. So my plan is to attempt to make my own cranks using the old TA s as a reference point. I'm just not sure about making rings....
    Emails are quicker.... RobvanI-81@hotmail.com

    ISO: Roberts frame/fork 58cm

  5. #5
    Senior Member southpawboston's Avatar
    Join Date
    Aug 2008
    Location
    Somerville, MA and Catskill Mtns
    Posts
    3,728
    Mentioned
    15 Post(s)
    Tagged
    0 Thread(s)
    Quote Originally Posted by Bianchigirll View Post
    aslong as you are happy with the choice of gearing I don't see why you need a triple. that does look like a big step or step and a half between the rings.
    I'd call that a wide-range double. They work well with newer 8-10 speed cassettes with close gearing between cogs. The idea is that you can use the large ring most of the time, and only drop into the granny gear when it's absolutely needed.

    The old "half-step + granny" triples solved the problem with 5-speed freewheels whose gears were widely spaced. The idea was that the half-step compensated for the wide spacing, allowing for 10 closely spaced gears (you had to use the FD a lot), with the granny gear only being used for really steep climbing. But half-step + granny is not needed with closely spaced cassettes/freewheels, so a wide-range (or compact) will do the trick.
    Riding the Catskills blog

    Flickr

    1971 Mercian Olympic | 1972 Jeunet 630 | 1982 Jack Taylor Tour of Britain | 1984 Shogun 1500 650B | 2013 Rawland Stag | 2014 Jeff Lyon L'Avecaise

  6. #6
    Senior Member Wogster's Avatar
    Join Date
    Jul 2006
    Location
    Toronto (again) Ontario, Canada
    My Bikes
    Norco Bushpilot (out of commission), Raleigh Delta
    Posts
    6,942
    Mentioned
    2 Post(s)
    Tagged
    0 Thread(s)
    Quote Originally Posted by RobE30 View Post
    Is a triple crank really needed for a bike that won't be used for any heavy "touring"? I'm paper building at this point my dream bike (separate thread as things progress) and I have most ideas figured out except the cranks. I was thinking something along the lines of TA cranks (like these) http://3.bp.blogspot.com/_C1XrRVl3W8...nk+3+small.jpg
    I'm just not sure if I need a granny gear. Thoughts?
    That looks like a compact double, triples are not always a lot lower then a compact double, the difference can be ½ gear inch or less. It all depends on the cassette or freewheel that your combining it with, on a dream bike, I would say go with a cassette hub, and make sure you have enough room for a large bottom cog, and not worry about the triple. You can use a gear calculator to make the choices easier.

  7. #7
    Señor Member USAZorro's Avatar
    Join Date
    Oct 2004
    Location
    Carlisle, PA
    My Bikes
    1954 Hetchins M.O., 1959 Viking Severn Valley, 1970 Raleigh Pro, 1972 Fuji "The Finest", 1974 Raleigh Superbe&Comp, 1976 Raleigh Team Pro, 1994 Trek 830 MTB, 2000 Bob Jackson Arrowhead, Unicycle
    Posts
    13,034
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)
    Quote Originally Posted by southpawboston View Post
    I'd call that a wide-range double. They work well with newer 8-10 speed cassettes with close gearing between cogs. The idea is that you can use the large ring most of the time, and only drop into the granny gear when it's absolutely needed.

    The old "half-step + granny" triples solved the problem with 5-speed freewheels whose gears were widely spaced. The idea was that the half-step compensated for the wide spacing, allowing for 10 closely spaced gears (you had to use the FD a lot), with the granny gear only being used for really steep climbing. But half-step + granny is not needed with closely spaced cassettes/freewheels, so a wide-range (or compact) will do the trick.
    between rhm's, and this post, I think almost every consideration is covered. Personally, I have found a 34-48 double with a 9 speed cassette to give me all the gearing I need without significant gaps in gearing through the ranges I need most often.
    The search for inner peace continues...

  8. #8
    PanGalacticGargleBlaster Zaphod Beeblebrox's Avatar
    Join Date
    Apr 2009
    Location
    Smugglers Notch, Vermont
    My Bikes
    Upright and Recumbent....too many to list, mostly Vintage.
    Posts
    7,488
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)
    I think as long as you pick the right derailleurs that can handle the chain wrap and can operate well with the large tooth difference between the chainrings its a great way to go.

    I've got a 50-28 on my Super Course and the 1st Gen Cyclone derailleurs can handle the Chain Wrap but the FD doesn't shift the large tooth difference as elegantly as it does with a lesser difference.

    I think though that on a bike you wanna ride all day long its a nice luxury to have 3 chainrings. Sure there's a lot of overlap with the gearing but sometimes its nice to just change the FD and get a slightly lazier range that's something other than Full on or Granny.
    --Don't Panic.

  9. #9
    Freewheel Medic pastorbobnlnh's Avatar
    Join Date
    Oct 2005
    Location
    Trying to Ride in the NH Mountains!
    My Bikes
    Vintage Schwinns, Classy Cannondales, & an '83 Santana Tandem
    Posts
    9,201
    Mentioned
    19 Post(s)
    Tagged
    0 Thread(s)
    I'd say it depends upon where you live and/or plan to ride, plus your weight and whatever might be loaded on your bike.

    Here in the mountains, a granny gear and a big bailout cog are always appreciated. But I'm a big guy, and it is not unusual to encounter some really steep climbs, even if they are short 100 yard long ones. There are several on C&V who feel this way. Better to have the gear when you need it, but rarely use it, than not have it at all. At least that is my philosophy, and I'm sticking to it!

    Best of luck on your build. Can't wait to see your custom built crankset.
    Bob
    Dreaming of Summertime in NH!

    Visit my websites:
    FreeWheelSpa.com orpastorbobnlnh.com

  10. #10
    Senior Member
    Join Date
    Nov 2005
    My Bikes
    Cinelli, Paramount, Raleigh, Carlton, Zeus, Gemniani, Frejus, Legnano, Pinarello, Falcon
    Posts
    5,775
    Mentioned
    2 Post(s)
    Tagged
    0 Thread(s)
    Quote Originally Posted by pastorbobnlnh View Post
    I'd say it depends upon where you live and/or plan to ride, plus your weight and whatever might be loaded on your bike.
    Yeah. I ride a single speed on the flats, but once I went triple I'm never going back!

    cintriple.jpg

  11. #11
    Senior Member
    Join Date
    Dec 2005
    Posts
    7,889
    Mentioned
    9 Post(s)
    Tagged
    1 Thread(s)
    Of my many bikes, I only have one set up with a triple, and it's a half-step plus granny. On most of the other derailleur-equipped bikes, I really like old-school compact doubles: 46/32 is a combo I like a lot as I'll do most of my riding in the 46t ring, including the occasional hill we get around here.

    Neal

  12. #12
    Senior Member bobbycorno's Avatar
    Join Date
    Sep 2007
    Posts
    2,545
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)
    Quote Originally Posted by RobE30 View Post
    Is a triple crank really needed for a bike that won't be used for any heavy "touring"? I'm paper building at this point my dream bike (separate thread as things progress) and I have most ideas figured out except the cranks. I was thinking something along the lines of TA cranks (like these) http://3.bp.blogspot.com/_C1XrRVl3W8...nk+3+small.jpg
    I'm just not sure if I need a granny gear. Thoughts?
    As at least one other has said, it depends on where you live and ride. In Florida or Kansas, 2 gears are overkill. Around here (east slope of the Cascades), or in the Rockies, too many gears is never enough. And one's build and climbing ability matter too: 5'8", 100lb, lungs the size of Texas? 53/42x11-19 should get you through the Alps just fine. At 6'3" and 185-190 lb, let's just say I'll never be a threat to Contador or the Schleck bros, so 46/28x12-28 is my default gearing. So the short answer is, you just gotta try a bunch of stuff and figure out what works for you. Simple, but not easy.

    SP
    Bend, OR

  13. #13
    no one cares -holiday76's Avatar
    Join Date
    Jan 2008
    Location
    NYCadelphOrnia
    Posts
    5,452
    Mentioned
    6 Post(s)
    Tagged
    0 Thread(s)
    RHM hit it dead on.
    I love a triple for loaded touring but short of that a compact double with a wide range rear more than does the trick in these parts. The TA crank is great since it's so versatile in gearing range, not to mention you can even run it as a triple or a double, or a single for that matter.

    BTW to reinforce what Rudi said, I also go by gear inches and usually shoot for around 30-100. the 100 is just so I dont top out going down the hills around here. 30 is more than low enough for me for all conditions short of all day touring full loaded in the mountains.
    Mmmm, bicycles.

    I prefer emails to private messages - holiday76@gmail.com

  14. #14
    Lurker
    Join Date
    Apr 2005
    Posts
    870
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)
    I think a lot depends on the terrain you are riding. Most of my longer rides start with a 2500ft elevation gain in the first 15 miles. If I do this on standard gearing, I am usually heading back down at this point, instead of going down the other side of the ridge and committing to another 2500ft on the way back up. Compact cranks work well with a 9 or 10 speed cassette, but I feel a triple works better for a vintage bike.

  15. #15
    Senior Member CMC SanDiego's Avatar
    Join Date
    Jan 2009
    Location
    San Diego
    My Bikes
    Ti Mongoose Pro-Cipressa w/DA, Giordana-XL Strada, Eddy Merckx OS Strada, Ti DBR-Mtn (hardtail), Fuji-Touring Series V, Raleigh SuperCourse X-tracycle, Burley Tandem
    Posts
    667
    Mentioned
    2 Post(s)
    Tagged
    0 Thread(s)
    Quote Originally Posted by pastorbobnlnh View Post
    I'd say it depends upon where you live and/or plan to ride.....Here in the mountains, a granny gear and a big bailout cog are always appreciated.
    Every bike that I've built to use myself gets a triple crankset because of my driveway. Every ride I take ends with me coming up that blasted hill, and I'm grateful for the triple everytime.

  16. #16
    Senior Member RobbieTunes's Avatar
    Join Date
    Dec 2007
    Posts
    15,517
    Mentioned
    44 Post(s)
    Tagged
    2 Thread(s)
    I have one triple for riding in the mountains.
    It's no heavier, and sometimes a long-cage RD is fun just because they seem so smooth.

    Robbie ♪♫♪...☻

    I'm not a doctor, but I watch them on TV.

    1982 Lotus Classique
    1987 D'Arienzo (Basso) SLX
    1995 Hot Tubes TT
    2006 Cinelli XLR8R-2
    2008 BMC Roadracer SL01
    2011 Eddy Merckx EMX3
    2014 Wraith Hustle

  17. #17
    rhm
    rhm is offline
    multimodal commuter rhm's Avatar
    Join Date
    Nov 2006
    Location
    NJ, NYC, LI
    My Bikes
    1945? Fothergill, 1948 Raleigh Record Ace, 1954 Drysdale, 1963? Claud Butler Olympic Sprint, Lambert 'Clubman', 1972 Fuji Finest, 1983 Trek 720, 1984 Counterpoint Opus II, 1993 Basso Gap, 2010 Downtube 8h, and...
    Posts
    12,640
    Mentioned
    56 Post(s)
    Tagged
    1 Thread(s)
    Quote Originally Posted by Zaphod Beeblebrox View Post
    I think though that on a bike you wanna ride all day long its a nice luxury to have 3 chainrings. Sure there's a lot of overlap with the gearing but sometimes its nice to just change the FD and get a slightly lazier range that's something other than Full on or Granny.
    I have to admit, you make a good point here. Half-step gearing, with or without the granny gear, means a lot of shifting, double shifting, and mental energy expended on shifting. That's fine, I know we all intelligent people and up to the task of figuring out what gear to use. But then again, when I'm riding, I don't like to think about shifting. With three evenly spaced chain rings you don't use all your gears, but since you don't think about it, it's not an issue.

  18. #18
    Senior Member
    Join Date
    Dec 2005
    Posts
    7,889
    Mentioned
    9 Post(s)
    Tagged
    1 Thread(s)
    On a historical note, I have a copy of a 1975 Cycling review of a Norman Fay English tourer. It uses a TA cyclotouriste crankset with 44/28t chainrings and a 15-16-18-22-25 freewheel, which gives a gearing range of 30.2 to 84.8 inches. Yup, compact doubles are indeed C&V.

    Neal

  19. #19
    PanGalacticGargleBlaster Zaphod Beeblebrox's Avatar
    Join Date
    Apr 2009
    Location
    Smugglers Notch, Vermont
    My Bikes
    Upright and Recumbent....too many to list, mostly Vintage.
    Posts
    7,488
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)
    Having a high gear of only 85ish is ok with me. Someone may have mentioned this earlier, but for an all-day rider, Personally I'd rather gear it a bit on the low side and run out of cork on downhills and have to just sit and coast (not a negative in my eyes ) than end up walking up the next uphill.

    I feel like a loser when I have to walk up part of a hill. I can only imagine how much worse that feeling would be if I were on a fancy carbo-tanium bike.
    --Don't Panic.

  20. #20
    Dolce far niente bigbossman's Avatar
    Join Date
    Dec 2004
    Location
    Northern CA
    Posts
    10,790
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)
    Quote Originally Posted by Zaphod Beeblebrox View Post
    Having a high gear of only 85ish is ok with me. Someone may have mentioned this earlier, but for an all-day rider, Personally I'd rather gear it a bit on the low side and run out of cork on downhills and have to just sit and coast (not a negative in my eyes ) than end up walking up the next uphill.

    I feel like a loser when I have to walk up part of a hill. I can only imagine how much worse that feeling would be if I were on a fancy carbo-tanium bike.
    I've got lots of steep stuff, all around me. I have triples on all my bikes. I have never had to walk up a hill.
    "Love is not the dying moan of a distant violin, it’s the triumphant twang of a bedspring."

    S. J. Perelman

  21. #21
    PanGalacticGargleBlaster Zaphod Beeblebrox's Avatar
    Join Date
    Apr 2009
    Location
    Smugglers Notch, Vermont
    My Bikes
    Upright and Recumbent....too many to list, mostly Vintage.
    Posts
    7,488
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)
    Yes but you are hardcore and I am but a puny girly-man with a 42T small ring.
    --Don't Panic.

  22. #22
    Wherever I may roam....
    Join Date
    Oct 2009
    Location
    Topton Pa
    My Bikes
    A few bikes
    Posts
    1,573
    Mentioned
    11 Post(s)
    Tagged
    0 Thread(s)
    Quote Originally Posted by Zaphod Beeblebrox View Post
    Having a high gear of only 85ish is ok with me. Someone may have mentioned this earlier, but for an all-day rider, Personally I'd rather gear it a bit on the low side and run out of cork on downhills and have to just sit and coast (not a negative in my eyes ) than end up walking up the next uphill.

    I feel like a loser when I have to walk up part of a hill. I can only imagine how much worse that feeling would be if I were on a fancy carbo-tanium bike.
    The worst part of walking up a hill and feeling like a loser is trying to see through the tears as your going down the other side!

    I think a set of TA knockoffs would fit the bill nicely. I'll just make sure that they can be swapped to a triple if needed (or not needed). On a related topic, any suggestions where to get 50.4mm chain rings? Or will I need to make chain rings? I think making rings will be tedious....
    Emails are quicker.... RobvanI-81@hotmail.com

    ISO: Roberts frame/fork 58cm

  23. #23
    Senior Member ColonelJLloyd's Avatar
    Join Date
    Dec 2009
    Location
    Louisville
    Posts
    8,196
    Mentioned
    4 Post(s)
    Tagged
    0 Thread(s)
    Quote Originally Posted by RobE30 View Post
    On a related topic, any suggestions where to get 50.4mm chain rings? Or will I need to make chain rings? I think making rings will be tedious....
    Easy to find on eBay and I know several forum members have some available. Velo Orange will sell their 50.4 BCD CNC'd alloy rings at some point they've said.
    Bikes on Flickr
    I prefer email to private messages. You can contact me at justinhughes@me.com

  24. #24
    Senior Member southpawboston's Avatar
    Join Date
    Aug 2008
    Location
    Somerville, MA and Catskill Mtns
    Posts
    3,728
    Mentioned
    15 Post(s)
    Tagged
    0 Thread(s)
    Quote Originally Posted by RobE30 View Post
    The worst part of walking up a hill and feeling like a loser is trying to see through the tears as your going down the other side!

    I think a set of TA knockoffs would fit the bill nicely. I'll just make sure that they can be swapped to a triple if needed (or not needed). On a related topic, any suggestions where to get 50.4mm chain rings? Or will I need to make chain rings? I think making rings will be tedious....
    renehersebicycles.com sells new TA rings. I just bought a 46T outer (50.4BCD) for $45. I got tired of scouring ebay for them.
    Riding the Catskills blog

    Flickr

    1971 Mercian Olympic | 1972 Jeunet 630 | 1982 Jack Taylor Tour of Britain | 1984 Shogun 1500 650B | 2013 Rawland Stag | 2014 Jeff Lyon L'Avecaise

  25. #25
    PanGalacticGargleBlaster Zaphod Beeblebrox's Avatar
    Join Date
    Apr 2009
    Location
    Smugglers Notch, Vermont
    My Bikes
    Upright and Recumbent....too many to list, mostly Vintage.
    Posts
    7,488
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)
    +1 to renehersebicycles.com I got mine there as well and I've dealt with those folks a few times now and have been consistently very happy with their customer service and helpfulness.
    --Don't Panic.

Page 1 of 2 12 LastLast

Posting Permissions

  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts
  •