BB30 Bottom Bracket for SRAM GXP When you want to install SRAM or Quarq’s 24/22mm diameter thru-axle crank into a bottom bracket shell measuring 68mm wide and 42mm in diameter, you need CeramicSpeed’s BB30 SRAM GXP bottom bracket. The CeramicSpeed bearings are hand-assembled and installed into aluminum cups that thread together for quiet durability without adapters. There are two bearing options. The first choice is our low drag, long life Standard Bearing, with hardened-steel races and our super round CeramicSpeed balls. The second choice is our Coated Bearing, which uses those same balls installed on coated, hardened-steel races for longer life and less bearing drag. In The Box Bottom bracket with bearings installed. 2 dust covers. 1mm spacer. 0.5mm spacer. GXP wave washer. All Round Grease. Sticker sheet.