Single-ring drivetrain simplifies functionality and provides the simplicity that cyclocross racers crave and the tighter gearing range is perfect for road racing and riding in flatter terrain Power readings are accurate within +/-1.5% and aren�t affected by climate conditions during a ride Power balance measures left and right legs separately Sram X-Sync wide-tooth, narrow-tooth chainring technology provides maximum chain control Laser-etched chainring finish is more durable DUB bottom bracket adds durability and simplicity 172.5x40 DUB Silver/Grey Direct Mount 1x12UPC/EAN/GTIN: 710845823435