SRAM S100 Eagle Crankset - 160mm 32t Steel Chainring Aluminum Crankarms For Powerspine Bottom Bracket BLK 49mm Chainline B1The SRAM S100 Eagle Crankset provides confidence with a robust aluminum crankset. A sturdy steel X Sync 2 chainring ensures the same chain retention performance as all other Eagle drivetrain cranksets. Requires PowerSpline bottom bracket (Sold separately)Aluminum crank arms with 3 bolt steel X Sync 2 chainring for Eagle Drivetrain Ecosystem compatibility Sturdy steel X Sync 2 chainring ensures the same chain retention performance as all other Eagle