BB30-24 for Shimano cranks Fits a Shimano road crank to a 68mm wide BB Shell or a Shimano 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. CROSS - $219.99 ROAD - $219.99 $219.99 Add to Cart This product is sold out.