Source
r/bikewrench•
HuskyOps

SRAM GXP longevity/issue question

Solved

Hey folks - anyone have long term experience with GXP threaded BBs? I have about 2k miles on it now, and it seems to have developed a 'bump' or 'flat' spot so to speak, which occasionally manifests while soft pedalling, and feels like it's coming from the chainring side. It's not making any clicks or noises as far as I can tell. I'm running Rival 1 cranks with a Wolftooth chainring if that helps. Everything was installed by me in accordance with instructions and using a torque wrench. Is one of my BB bearings on the way out? Could something else be the source of this intermittent 'bump/flat spot'? I have already ruled out pedal bearings by testing multiple pairs, and I just realigned and tuned derailleur. Thanks for any suggestions! PS sorry about wrong flair I didn't know what to choose lol.

Posted Nov 1, 2022, 2:48 PM UTC

27
welcometothepotato•

Wow you got 2k miles out of a GXP BB?

I joke, but at the same time I’ve had to replace one after only a quarter of that distance after a bad winter once. It all really depends on your riding style and conditions. Take the cranks off and feel the bearings, you’ll be able to tell if there’s any play or roughness without the cranks

6
runallthetrails•

Hard to say without seeing it in person, but a sram gxp bb is less than $30 new so it would be cheap to replace and see if that solves the problem.

2
HuskyOpsOP•

Where can I find it for less than 30? Only options online are typically 40 with shipping.

1
runallthetrails•

I just googled Sram GXP bottom bracket and many options come up below $30. I don't know which specific one you have, so there may be price differences, but even $40 is cheap. Bottom bracket replacement is a 10 minute job you can easily do at home and since it does have bearings in it, it's definitely a wear part. I'd say getting 2,000 miles out of it for $40 is pretty solid.

2
kopsis•

Have the BB shell faced when you replace it. Anything less than perfect alignment greatly accelerates bearing wear.

2
HuskyOpsOP•

How much does a shop typically charge for facing the BB?

1
kopsis•

If the BB is already removed, I would expect $20 or less.

2
jzwinck•

I got about 14,000 miles out of mine.

1
HuskyOpsOP•

Lucky!

1