This is a SRAM BlackBox GXP Ceramic Road or Mountain Bottom Bracket. The Blackbox GXP bottom bracket is a high performance, external bearing bottom bracket. The GXP system captures the left side bearing between the spindle and the left crankarm while allowing the drive-side bearing to float axially on the spindle, thereby eliminating the necessity to side-load bearings during adjustment. The simplicity of installation is refined: once it is tightened to the proper specifications you are ready to roll with a worry free bottom bracket. The GXP system uses two bicycle specific cartridge bearings and eight seals for a smooth and long lasting ride and SRAM’s gutter seal technology drastically improves sealing against the elements while reducing seal drag.
Giga X Pipe (GXP)
An external bearing system with 3D forged, heat treated and CNC'd 24mm OD Chromoly spindle integrated with right crank arm; custom cartridge bearings with eight seals and CNC'd alloy cups.
BB/Frame Interface: BSA/English
Spindle Interface Type: TruVativ GXP
BB Shell Width: 68 & 73