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Real noob question here but even after hours of online searching I am struggling to find an answer.
I am currently migrating parts from my old Giant xtc4 to my new Genesis IO frame. One of the many compatibility problems I have run into is that when trying to reinstall the Shimano hollowtech 2 cranks and bottom bracket that the spindle for the cranks (which is 120mm) is too short for the BB shell for the Genesis (which is 73mm) - so what I am basically looking for is a new set of cranks,but am not sure what size spindle I need? Also is there a variation in spindle length for hollow bite cranks, as I can't seem to find this?
And obviously if anyone has some cranks lying around that fit the bill then I would certainly my be interested in buying them...
Have you fitted any of the black plastic spacers in between the frame and the external bottom bracket shells?
If they're HT2 with external bb cups it should just be a matter of changing the spacers behind the bb cups, 73mm shell should just need one spacer behind the driveside cup iirc.
There are a couple of small spacers on the drive side, but by the looks of it even if I remove them the spindle will still not be sticking out far enough for non-drive side crank to be attached.
The cranks should be fine. The BB should be installed with one spacer on the driveside when used on a bike with a 73mm bottom bracket shell. On a 68mm bottom bracket it's one spacer on the non driveside and two on the driveside.
Should be 1 spacer driveside, non on the non driveside.
You should have had 3 spacers on the old bike (assuming a 68mm bb shell).
On the new build (73mm bb shell) you should only be using 1 of those spacers (drive side iirc).
Each spacer should be 2.5mm thick.
I have never heard of a crank manufactured purely for a 68mm shell.
Sometimes the crank needs tapped though the BB with a rubber mallet.
Thanks guys, got it sorted now. Removed one drive side spacer and went at them with the rubber mallet with a bit more vigour and it fits fine. Ta for the advice, it does tend to be the easy solution!
Percussive calibration tools are marvellous things, aren't they 😀 I owe all my ham-fisted mechanical skills to them.