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Sram gxp crank in a shimano bb

Posted: Mon Dec 02, 2019 10:51 pm
by htrider
Apologies for the "is this compatible" type question....
Just discovered the incompatibility of this set up, having never noticed that the sram GXP crank spindle is 22mm, dia on the nds. Anyway I've ordered a shim from fleabay and then read loads of stuff about this not working. Anyone shed any light / joy on this?

Re: Sram gxp crank in a shimano bb

Posted: Mon Dec 02, 2019 10:55 pm
by whitestone
You can get Hope GXP adapter shims for Hope BBs, I think there are third party ones for Shimano BBs but haven't used them.

Do a search on STW about it, quite a few threads on there.

GXP is one of those stupid "just to be different" SRAM designs.

Re: Sram gxp crank in a shimano bb

Posted: Mon Dec 02, 2019 11:04 pm
by htrider
Cheers Bob - the ebay one looks like a steel version of the hope one. Just sussed out that the sram system clamps the nds crank to the nds bearing which is actually quite a neat way of avoiding the preloading-of-the-bearing-just-right shenanigans on Shimanos. Pity they don't spec a needle roller in the drive side which would work well with this set up and may have persuaded me to buy another sram bb.

Re: Sram gxp crank in a shimano bb

Posted: Mon Dec 02, 2019 11:08 pm
by sean_iow
whitestone wrote:
Mon Dec 02, 2019 10:55 pm
GXP is one of those stupid "just to be different" SRAM designs.
It's actually quite clever as there is no bearing pre-load to set as the crank is only retained laterally in the non-driveside bearing and floats in the driveside with just a crinkle washer to hold the seal in place. This removes one of the biggest causes of bb failure from the process, namely people over-tightening the pre-load nut.

I've got a sram crank in a hope bb with the adapter and it works well.

Re: Sram gxp crank in a shimano bb

Posted: Mon Dec 02, 2019 11:48 pm
by boxelder
Another one with Hope spacer, which has been flawless for 2 years - but it is in a Hope BB.

Re: Sram gxp crank in a shimano bb

Posted: Wed Dec 04, 2019 7:57 am
by Charliecres
I’m using a Shimano BB and a cheap eBay adaptor with a SRAM crank. The stock SRAM BBs just don’t last. The adaptor set-up has only been running for a couple of months, so can’t say yet if it’s a winner.