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  1. #1
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    1986 Schwinn Peloton - Bottom bracket sizie help

    I've searched the forums and googled for the correct sizing of a bottom bracket for above mentioned road bike. The threads on the chain side have worn lose and I need to replace it ASAP.

    I've also looked at the spec sheet from the 1986 magazine (http://bikecatalogs.org/SCHWINN/1986...1986Ltwt30.JPG
    but was unable to find any helpful information.

    Thanks in advance for all the help I can provide pictures or anything if necessary.

  2. #2
    Uff Da!
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    I think spindle length depends on the crankset that you are using. Are you using the stock(original) crank that the bike came with?

    As for threading, it's standard British 1.37" x 24tpi and 68mm width.

  3. #3
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    If you can do with a new cartridge BB then..
    I had the same need a few years ago for a Trek 660 that came to me as a frame set. I got a Shimano 600 double crank and went for a UN54 cartridge BB. I went to the LBS and told them the situation.
    I want a 110mm and if it's wrong can I just swap it for the right length. No problem. 110 was too short, went back and got a 113mm. Easy peasy and relatively cheap. http://www.jensonusa.com/store/produ...m+Bracket.aspx

  4. #4
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    BB is standard ISO/english threading.

    The length you need is the same as the old one, which is probably around 114-117 mm. Bring the old one into the shop and they can measure it for you with no problem.

  5. #5
    old and fixed... clubman's Avatar
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    With a Sprint crankset, you want a 110mm axle.

  6. #6
    Bianchi Goddess Bianchigirll's Avatar
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    if the threads are messed up on the fixed cup, I think you should take the bike to a shop. there could be issues with the threading inthe shell
    Bianchis '87 Sport SX, '90 Proto (2), '91 Boarala 'cross, '93 Project 3, '88 Trofeo, '86 Volpe, '89 Axis, '79 Mixte SOLD, '99 Mega Pro XL Ti, '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, '89 Trek 2000, '?? Jane Doe (still on the drawing board), '90ish Haro Escape

  7. #7
    Iconoclast rat fink's Avatar
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    That frame would have come with a Sugino 75 crankset and BB. I believe it actually used a Campy style taper.
    "Winning is the best deodorant. Someone can look at your bike and say it stinks, but if you win with it, suddenly it's okay." - Jim Busby

  8. #8
    Senior Member miamijim's Avatar
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    Quote Originally Posted by rat fink View Post
    That frame would have come with a Sugino 75 crankset and BB. I believe it actually used a Campy style taper.
    +1

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    WWW.CYCLESPEUGEOT.COM 2005 Pinarello Dogma; 1991 Paramount PDG 70 Mtb; 1976? AD Vent Noir; 1989 LeMond Maillot Juane F&F; 1993? Basso GAP F&F; 1989 Terry Symmetry; 2003 Trek 4700 Mtb; 1983 Vitus 979

  9. #9
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    Thanks for all the replies. I'll probably take it to the shop and have it looked at to make sure the shell threading is ok.

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