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motobecane frame(3 posts)

motobecane framevoitto
Jun 30, 2001 11:26 AM
ive a small steel 80's motobecane frame , does a durace bottom bracket work for this frame , where shuold i find parts to build up from frame , new parts ok thanks , will from nevada
re: motobecane frameDaveG
Jun 30, 2001 1:40 PM
Will, there is no simple answer to your question. You need to be sure you have the correct BB axle length, shell size and threading. There are several thread "standards": English, Italian and French are possible on your bike. English and Italian BBs are easy to find. French is a bit obscure these days and hard to find - given the French origin of Motobecane this could be your problem. Axle length is more related to the cranks you will be using. Shell sizes include 68,70,73mm. If you can easily remove the BB, take it to a shop (one that is experienced with road bikes) and get a replacement. Otherwise take the whole bike in. Don't assume that any garden variety Shimano BB will work or you could trash the threading. Good luck.
Check threading firstCalvin Jones-Park Tool
Jul 2, 2001 1:26 PM
As I recall, those were transitional years regarding the 35mm x 1mm bottom brackets. If the pedals are 9/16", it is likely the bottom bracket is English/ISO (1.37" x 24 TPI). Take a cup with you to a good shop to know for sure. Just measuring the pitch will tell the story. Swiss threading by the way also used a left handed drive side up, with the 35 x1 threading.

Good luck with the re-build.