Utilising MRP's patented integrated skid, the XCg tucks neatly behind your crankset and protects those costly chainrings from damage. The replaceable nylon skid glides over rocks and obstacles.- Two sizes, 32t and 36t- Great accessory to protect costly chainrings- Integrated skid protects chainrings and glides over rocks and obstacles- 88g (XCg V2 32t, ISCG-05 model)