The SRAM XX1 GXP 11 Speed Q-factor 170mm Crank is built for total chain control. Each tooth's thickness is CNC-machined to fit better into the chain's inner & outer links, helping make your 1x drivetrain simpler, lighter & more durabble. This crank is supplied with a 32T direct mount X-Sync chainring. Available in 2-Tone anodized Black/ Red, matching cranks & chainring. 170mm long only.