Technical & Reference Section > Tech and Restoration

crank differences

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ablister:
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

selfpreservation:
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

ablister:
thanks  :D

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

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

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