The winter has been a long one, muddy trails and grime have left our bikes feeling neglected and creaky. The source of dreaded mystery cracking noises can be hard to identify, but often they come from broken bearings in the bottom bracket. These bearings have a hard life, sitting in an exposed position they are subjected to the worst of the weather, and for a regular rider are often destroyed within a cycling season. In this service guide we tell you how to exchange a GXP Bottom Bracket including bearings and how to mount the crank again afterwards.
Tips and Tricks:
Pay attention to the right-and left-hand thread!
Hollowtech 2 cranks are not compatible with GXP bearings.
Ceramic bearings must be regreased every 50h in dry conditions and right after a ride when it is wet – we recommend buying regular BBs.
Always check the chainring screws if you have a suspicious cracking noise.
Picutres: Christoph Bayer Words: Christoph Bayer / Trevor Worsey
PS: Readers' Survey 2017 - Give feedback, win awesome prizes: We're giving away an exclusive Trek Slash 2018 in top spec! Click here to take part now!