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I'd assemble the bb on the spindle and see what kinda width you get to. I thought GXP didn't need spacers but maybe I'm thinking of the road/track version as it was with Omnoms that I used it so maybe the mtb version needs spacers as per Shimano.
The larger bit is the self extracting cap, screws into the arm after the crank bolt and the crank bolt pushes against it to remove the crank when you undo the bolt.
M_V
sacredhart
Couple of questions please.
SRAM gxp. On a 68mm BB SRAM say put 2.5mm spacer each side but I have read several accounts on here of people not using them. Do they make any difference?
My second hand crank only has a single bolt holding it together. There are two bolts normally
https://www.sjscycles.co.uk/chainsets/sram-gxp-crank-arm-bolt-m15-m22-alloy-self-extracting-black/
What does the second larger bolt do of anything?
Thanks