I just grabbed a used crank, so I am going from square to ISIS, but I dont know what bottom bracket go get.
Current set up is 2007 FELT Q620, crank is truvativ isoflow, frame is 15.5.
Is there a way to tell what size the bb is, without taking it out, since I dont have the tool yet?
Or, is there an ISIS bb that will fit many sized that would for sure fit mine?
Measure the spindle the same way unless you have access to long armed calipers. You will have to eyeball since you can't get it out but you should be able to get within 1 mm.
Pull the crank arms off and measure from end to end.
I ordered a 68/113 BB, also talked to Race Face, thats what they recommended for the crank.
Thanks for all the info!
cheers.
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