SRAM Truvativ X.9 Crankset Hollow-forged aluminum arm mated to a 4-arm forged aluminum spider Optimized Q-factor with a 49.5mm chainline and a drive-side integrated GXP Taper-machined, hard-anodized 7075-T6 aluminum rings with optimized X-Glide shift pins/ramps, All-Mountain bashguard 850g GXP Team cartridge bearing bottom bracket included for 68/73mm threaded shells