Sram: Gravel bikes deserve our lightest and stiffest cranks too. The RED XPLR crankset maximizes tire clearance and features our hollow carbon arms paired with the direct mount 1x chainring of your choice. This crank is built to please every rider, even those who prefer the unpaved. FEATURES Single-ring drivetrain simplifies functionality and reduces weight Non-aero direct mount chainrings from 38T to 46T can be swapped with a single tool SRAM X-SYNC wide-tooth, narrow-tooth chainring technology provides maximum chain control Ultra-light hollow carbon fiber crankarms DUB bottom bracket adds durability and simplicity Can be upgraded to a power meter Available in 165, 167.5, 170, 172.5, and 175 mm lengths SPECIFICATIONS Speeds 12/13 BB Compatibility All SRAM Road WIDE DUB BBs Chainring Size 40T Crank arm length 165mm, 167.5mm, 170mm, 172.5mm, 175mm Chainline 47.5mm BB Spindle Interface DUB Chainring material Aluminium Guard No Guard Crank arm material Carbon Colour (Crank arm) Natural carbon