BB30-GXP for Sram GXP cranks CROSS - $239.99 ROAD - $239.99 $239.99 Add to Cart Fits a Sram GXP road crank to a 68mm wide BB Shell or a Sram GXP MTB crank to a 73mm wide BB Shell. Choose road bearings for road bikes, cross bearings for mountain bikes and cyclocross. Also for road bikes if you frequently ride on wet roads. This product is sold out.