Wolf Tooth Elliptical GXP Direct Mount Ring. Features: Elliptical shape for improved power transmission Direct mount ring replaces the existing chainring and spider on 3-bolt GXP cranks Asymmetrical tooth shape for the best wear life, chain retention and mud clearance Fits SRAM S2200, S2210, X9, X0, X01, XX1, X1 and Truvativ AKA GXP cranks Dished ring provides 50mm chainline on GXP or BB30 / PF30 long spindle (with15.4mm drive side spacer) Recommended for use with 10 or 11sp chain (10sp chain works on 9sp drivetrain) Made in the USA from 7075-T6 aluminum alloy Specifications: Teeth: 28T-42T Ring Type: 1x (Drop-Stop) Mount Style: GXP Direct Mount BCD: N/A Offset: 6mm Offset Speeds: 9-12 speed Shape: Oval Material: Aluminum Weight: TBD Color: Black