FSA Gossamer BB30 170mm 10 Speed Crankset Compact 50/34 FSA (Full Speed Ahead) Gossamer Road Crank/Bottom Bracket Sets Left arm uses a pinch bolt 7900 and Campagnolo 11 Speed compatible chainrings sold separately Item SpecificationsColorBlackBB/Frame InterfaceBB30Spindle Interface TypeBB30/PF30Pedal Spindle9/16"Chainring BCD110mmArm Length170mmRings34/50Crank-FD TypeRoad CompactBB Shell Width68mmBB IncludedYesCrank Intended UseRoadChain CompatibilitySRAM 10,Shimano 10,Campagnolo 10Defined ColorBlack