SRAM S500 Eagle Crankset - 170mm 32t Aluminum Chainring Carbon Crank Arms DUB Wide Spindle BLK 55mm Chainline B1Quality and durability combine in the S500 Eagle DUB crankset to deliver consistent performance every time out. Carbon crank arms and an aluminum X SYNC 2 chainring keep the weight down and the chain in control. DUB technology features a more uniform approach to bottom bracket fitment better sealing against contamination and forward and backward compatibility. Carbon crankset with 3 bolt aluminum X SYNC 2 chainring for Eagle Drivetrain Ecosystem