BB heads spinning

nick_n_ii · September 27, 2015, 11:16:59 AM

Ok very noob question.

Can someone explain BBs to me. I don't really understand one from another.

BSA, BB30, press fit, threaded, threadless?

JohnnyNT · September 27, 2015, 11:30:49 AM

Non-threaded here: http://problemsolversbike.com/files/tech/Bottom_Bracket_Standards_Reference.pdf
Add BSA that is threaded, 73mm wide and for 24mm spindle and you have mostly everything covered.

nick_n_ii · September 27, 2015, 11:46:58 AM

Thanks that does help.

Now the one thing on that list I have a question on is it says 68mm road and 73mm mountain. But why than do some FS frames have the 68mm?

JohnnyNT · September 27, 2015, 11:54:01 AM

I seriously doubt it. Well, there was 68mm BSA as well in MTB, but nowadays most manufacturers stick to 73mm with modern design. Anyway, shorter crank spindle or some shims can solve it.

Carbon_Dude · September 29, 2015, 04:50:34 PM

More good BB info:
http://www.sheldonbrown.com/cribsheet-bottombrackets.html

BB heads spinning

nick_n_ii

JohnnyNT

nick_n_ii

JohnnyNT

Carbon_Dude