For 27.5 inches (650B) Wheel. DeFender XC11 is a lightweight removable rear fender providing exceptional mud/spray protection. Multiple pivots allow easy fender angle adjustment for a perfect fit while the quick release clamp adjusts to fit 25.4, 34.9 mm seatposts. Advanced high impact plastic is co-molded to a flexible trailing edge for resistance to impacts. Features a highly polished underside to prevent mud buildup and aids in cleaning.