The SRAM/Truvativ GXP 100mm Bottom Bracket features a 3D forged, heat treated and CNC'd 24mm OD CroMoly spindle integrated with the right crank arm, and custom cartridge bearings with eight seals and CNC'd alloy cups. This left and right bottom bracket bearing cup set is only compatible with Giga X Pipe (GXP) fat bike cranks such as X5, X9, X1, and XX1.
My set only lasted one (1) year. A single winter of riding my fat bike on snow did them in. The seals did not hold and water/grit got inside and ruined the bearings. This is not a total surprise since my previous BB with external bearings (different manufacturer) only lasted 2 winters. However I was expecting to get the same lifetime from these.
I am ordering another set because SRAM's GXP is a very good value crankset and their bearings are 1/2 to 1/3 the price of the alternatives. However this time I am going to use a lot more waterproof grease and take care to clean and re-grease more frequently.
I replaced a SRAM GXP fat BB with the same exact thing. The old one was a pain initially with the drive side bearing cap constantly migrating out, which created play, but I finally got it situated and it had no play whatsoever when I changed it. This one has also been a huge pain and actually needed an extra BB spacer added to be tight. Even my mechanic was stumped. If only shimano made a fat crankset....
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