SRAM/Truvativ GXP 100mm Bottom Bracket The SRAM/Truvativ GXP 100mm Bottom Bracket features a 3D forged, heat treated and CNC'd 24mm OD Cro Moly 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. Specifications: Compatibility: Fat Bike BB Shell Width (mm): 100 mm BB/Frame Interface: English Spindle Interface Type: Tru Vativ GXP Weight: 130 g | Sram |Truvativ Gxp 100Mm Bottom Bracket Gxp, 100Mm, English, 00. 6415. 045. 070