how to measure what size ISIS BB for Turbines

porschenut911 · Jan 8, 2012

I have a pair of Race Face Turbines I bought about 10 years ago, they are 9spd compact drive with ISIS BB. I haven't used them in years and no longer have an ISIS BB, however I want to fit them to my girlfriends reasoanbly modern Diamond back which is currently fitted with Truvativ square taper cranks which weigh a ton.

How do I go about sussing out what axle length BB I need?

Thanks!

cyfa2809 · Jan 8, 2012

Probably not much help at all but i normally just try a couple different ones as i (and many on here) generally have a few square taper bb's lying around. I bet the same cant be said for isis though.

I normally go for 113 as a start point. Be interested to know if there is a rule for this though.

FluffyChicken · Jan 8, 2012

A link for you (p.s. 113mm)
http://raceface.com/instructions/CRANKS ... _crank.pdf

cyfa, as ISIS created a standard, they also have standard lengths apparently. Which is nice.
113mm being the standard 68/73 shell length one for MTB triples.

cyfa2809 · Jan 8, 2012

Thats excellent.

porschenut911 · Jan 8, 2012

Thanks for the advice. I bought them years ago from the local bike shop and they supplied suitable bb which is long gone now. I'll order one up and continue pimping her bike - It is a basic Diamond Back alloy frame with all my old bits - Pace RC31 forks, Bontrager bars, hydraulic discs, Hope/Mavic717 wheels, Deore groupset and now Race Face Turbines. Not that she'd notice any difference she still hasn't worked out how to change gear effectivly!

how to measure what size ISIS BB for Turbines

porschenut911

Retro Guru

cyfa2809

FluffyChicken

cyfa2809

porschenut911

Retro Guru

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