Truvativ Hammerschmidt AM Crankset (175mm, 24T I-05) Overdrive technology with 2-speed internal gearing (shifts while coasting), compatible only with Hammerschmidt X.0 and X.9 shifters 22/36 or 24/38 gear range with a single ring Forged hollow alloy crank arms, kit includes adaptors for ISCG and ISCG05 frames Requires ISCG tabs on frame for installation More ground clearance than regular chain rings