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Technical & Reference Section => Tech and Restoration => Topic started by: ablister on September 04, 2006, 09:47 PM

Title: crank differences
Post by: ablister on September 04, 2006, 09:47 PM

hi, please can someone tell me the differences between the crank BB sizes. USA, Euro, mid etc and how do i know what i have?

thanks, ali

Title: Re: crank differences
Post by: selfpreservation on September 04, 2006, 09:52 PM

new school bikes tend to have euro bb old school usually have US bb you can tell by looking a US bb is about 2 inches diameter and a euro is 19mm 3/4 an inch so its pretty easy to tell , also mongoose bb have a different thread to standard bb/cranks

Title: Re: crank differences
Post by: ablister on September 04, 2006, 10:07 PM

thanks  :D

Title: Re: crank differences
Post by: MeddlE on September 05, 2006, 10:16 AM

US BB have press in cups, Euro has smaller screw in cups, mid has no cups as the bearings press straight into the frame.

Title: Re: crank differences
Post by: brass monkey! on September 05, 2006, 12:08 PM

New School BB's are also the same size as Mountain Bike BB's - so I believe !