Bottom bracket sizing

dandy1 · Sep 5, 2025

Have you got a pic of the side of the crank arms? Or on the inside of the arm, usually by the pedal thread hole they'll be a model number

slackboy · Sep 5, 2025

those are Shimano STX cranks, from 1995ish. The axle length should be 110-113 mm

There is a comprehensive bottom bracket size dbase here:

https://www.sheldonbrown.com/bbsize.html#stx

Tootyred · Sep 5, 2025

Just don't forget to measure the bb shell too. It might be 68 or possibly 73. You dont want to end up with one that won't fit in!

CCMDoc · Sep 6, 2025

I’ve always found Sheldon Brown’s work to be very helpful

Sheldon Brown Bottom Bracket Guide

CCMDoc · Sep 6, 2025

I see Slackboy beat me to it - on the same wavelength I guess.

Bottom bracket sizing

dandy1

Senior Retro Guru

slackboy

Tootyred

Old School Grand Master

CCMDoc

CCMDoc

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