PROWHEEL Road Bike Crankset 9/10/11/12Speed 40/42/44/46/48/50T GXP Chainrings Bottom bracket BB 170/172.5mm Sprocket Crank set specification: Brand:PROWHEEL Model: DMA Crank Length:170/172.5mm Chainring:40/42/44/46/48/50T BB:PW-BB68+ Crank Material:FORGED AL-6061-T6 Crank Finish:Black sand ano. Compatibility:9/10/11/12S Chainring Material:AL-7075-T6 Chainring Finish:Black sand ano. Q-FACTOR/I-FACTOR:153/124mm Package Included: 1*Bottom bracket 1*Crankset