Sram gxp crank in a shimano bb

Talk about anything.

Moderators: Bearbonesnorm, Taylor, Chew

Post Reply
User avatar
htrider
Posts: 3107
Joined: Wed Apr 02, 2014 10:51 pm
Location: Fife
Contact:

Sram gxp crank in a shimano bb

Post by htrider » Mon Dec 02, 2019 10:51 pm

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?

User avatar
whitestone
Posts: 6006
Joined: Thu Dec 04, 2014 10:20 am
Location: Skipton(ish)
Contact:

Re: Sram gxp crank in a shimano bb

Post by whitestone » Mon Dec 02, 2019 10:55 pm

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.
Better weight than wisdom, a traveller cannot carry

User avatar
htrider
Posts: 3107
Joined: Wed Apr 02, 2014 10:51 pm
Location: Fife
Contact:

Re: Sram gxp crank in a shimano bb

Post by htrider » Mon Dec 02, 2019 11:04 pm

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.

User avatar
sean_iow
Posts: 2733
Joined: Tue Sep 30, 2014 12:08 pm
Location: Isle of Wight

Re: Sram gxp crank in a shimano bb

Post by sean_iow » Mon Dec 02, 2019 11:08 pm

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.
Adventure without risk is Disneyland - Bikemonger

boxelder
Posts: 534
Joined: Sun Dec 07, 2014 8:05 pm

Re: Sram gxp crank in a shimano bb

Post by boxelder » Mon Dec 02, 2019 11:48 pm

Another one with Hope spacer, which has been flawless for 2 years - but it is in a Hope BB.

User avatar
Charliecres
Posts: 1124
Joined: Tue Oct 01, 2013 1:28 pm

Re: Sram gxp crank in a shimano bb

Post by Charliecres » Wed Dec 04, 2019 7:57 am

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.

Post Reply