Join Date: Nov 2005
Location: Allston, MA
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Thompson Bottom Bracket
A while ago, I bought an old (1960's?) three speed for dirt cheap and converted it to a fixie. I love it. I've gotten everything on the bike exactly how I want it, except for one thing... The Thompson bottom bracket. I have to re-adjust it all the time, and I'm not sure if I can ever get a different chainwheel or cranks. (The chainwheel is permanantly attatched to the crank, which is permanantly attatched to the axle and the fixed cup.)
I understand these things are pretty rare, as a search on Google turned up only a few relevant websites which just said, "this is what a Thompson bottom bracket is, it's pretty rare."
I guess my question is this - is it possible to convert this type of bottom bracket to conventional cup and cone or cartridge? If not, is there any way I could get different cranks or a different chainwheel? Anywhere I could find parts for Thompson bottom brackets?
Thanks so much in advance for your help.