FSA Gossamer Road MegaExo crank/bb sets for Shimano. Features * MegaExo: an integrated crank/BB system with oversized 24mm O.D. splined CroMoly BB axle, oversized external cartridge bearings and alloy bearing, weights include BB * Cold forged aluminum crank arms, monocoque crankarm/spider * Left arm uses a pinch bolt * CNC-machined AL7075/T6 chainrings 53/39t, ramped and pinned (unless noted). AL7075 Torx T-30 chainring bolts (tool included) * Weights include BB