Basically the title, I had trouble tightening this GXP bottom bracket where it was getting lose, probably due to the spacers as I was using one 2,5mm spacer on both sides, and with soo much tightening and untightening, the bolt got trashed.
How can I fix this?
by Cergal0
3 Comments
Buy a better allen key next time
Isn’t that just a cap, for self extracting bolt?
If so, no need to go ugga bugga on it. The 8mm hex requires 40+nm torque, the cap just tight enough
Yeah that’s the extractor cap you’ve rounded out.
The 8mm hex bolt is the one that tightens your crank and also removes the crank. When you undo the 8mm bolt (turning it counter-clockwise) it presses **back** on the extractor cap and pushes the crankarm off.
The extractor cap uses a significantly smaller amount of torque. The 40Nm+ is only for the crank bolt – the 8mm one.
Now it’s rounded off though, I’d be tempted to drill two holes into the cap to fit a good quality pin spanner in. Or drill a notch to whack it out with a hammer and punch (the cap is ruined so will need replacing anyway). Be careful not to damage the crank regardless of the method you choose.
Make sure you have a [replacement cap](https://www.biketart.com/products/sram-spare-crank-arm-bolt-m15-m22-alloy-self-extracting-gxp?variant=40809673687219) ready to install when you do this. Searching “GXP Crank bolt” should bring up local options to you – complete with the extractor cap.
Once the extractor cap is installed you shouldn’t (in theory) ever need to touch it again.