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Help with GXP and sram force crankset

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Help with GXP and sram force crankset

Old 12-04-14, 11:34 PM
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QUSwimming
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Help with GXP and sram force crankset

So I bought a SRAM force crankset with a GXP spindle (24-22mm). I have a bike frame with a 86mm shell and a FSA BB86 press fit that was previously installed. The spindle fits through the BB but is loose on the nd side.

My question is do I need a new BB that fits the GXP spindle specifically? I am aware that the spindle actually tapers meaning that it will not fit a 24mm ID bearing but I'm wandering if I could buy something i.e. a shim to make my current BB work.

Also does anyone know which of these might be the better purchase?
These are the two I have found:

https://www.sram.com/truvativ/produc...ressfit-gxp-bb
SRAM PressFit GXP Alloy Bottom Bracket | Chain Reaction Cycles

It seems either would work but I'm not sure which would be better.

Thanks for your input!

BTW: I have done plenty of research about bottom brackets, and have learned a lot despite how confusing this subject is. I am wanting to know if someone can confirm that I have everything straight before I end up buying something that I don't need. Sorry for the post note, I just want to avoid the proverbial "have you tried google", "do a forum search", and "read the product description". So far I have found this forum exceptionally helpful and appreciate the great threads I have read on this site!
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Old 12-05-14, 12:08 AM
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k_kibbler
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You need a new bottom bracket. The two you linked to are the same, just that one is for MTB and one is for road. Just make sure you get the 86mm BB for road.

EDIT: You might be able to get just a 22mm ID NDS bearing and corresponding bearing seal for GXP (check Wheels Manufacturing or others), but that seems like a bodge job and for the cost and effort you might as well get a full SRAM GXP BB.

Last edited by k_kibbler; 12-05-14 at 12:14 AM.
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Old 12-05-14, 01:32 AM
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Kimmo
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Originally Posted by QUSwimming View Post
a shim to make my current BB work
You might be able to scrounge one from your LBS; you need an old GXP BB, and there's an aluminium shim in the NDS bearing. Should fit, fingers crossed
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Old 12-05-14, 09:11 AM
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[QUOTE=k_kibbler;17363522]You need a new bottom bracket. The two you linked to are the same, just that one is for MTB and one is for road. Just make sure you get the 86mm BB for road.

Wow, that seems pretty obvious. I'm not sure how I managed to miss that but I'm grateful you pointed that out.

Im im nervous about using shims on a BB considering the forces it already takes and $30 seems like a small price to avoid the frustration.

thank you both for your help!
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Old 12-05-14, 09:12 AM
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Originally Posted by k_kibbler View Post
You need a new bottom bracket. The two you linked to are the same, just that one is for MTB and one is for road. Just make sure you get the 86mm BB for road.
Wow, that seems pretty obvious. I'm not sure how I managed to miss that but I'm grateful you pointed that out.

Im im nervous about using shims on a BB considering the forces it already takes and $30 seems like a small price to avoid the frustration.

thank you both for your help!
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Old 12-05-14, 09:48 AM
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Haha...I went through the same issue with an MRP spindle. Rather than taper, it steps down to 22mm. The non-drive bearing does have a shim installed. Anyway, I figured I could replace the bearings only, and save a few bucks. Wrong. The bearings on the MRP are 1mm thicker than any other BB replacement bearings on the market. I thought about purchasing replacements through Enduro and making a couple 1mm shims to take up the slack, and still may go that route. However, I'm more likely to buy the SRAM since it will work, and hopefully it uses a standard thickness so I can replace them later if the need arises.

I would happily provide you with the shim at no cost. It's for a 68/73 mountain BB, but I don't think that makes much of a difference as far as the shim goes. I'd be interested to see if it works!
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