The Sram Red 1 AXS power meter offers improved aerodynamics for triathlon and time trial bikes, thanks to direct mount aero chainrings with fully integrated power Single-ring drivetrain simplifies functionality Fully integrated power into a direct mount aero chainring 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 170x48 Aero DUB Black Direct Mount 1x12