For 27.5" (650B) Wheel DeFender™ M1 is compatible with all standard front forks including reverse arch designs, the unique quick release attachment system integrates the DeFender™ M1 seamlessly with the front of your bike. The XC11 is a lightweight removable rear fender providing exceptional mud/spray protection and built specifically for 27.5" (650B) mountain bikes. Multiple pivots allow easy fender angle adjustment for a perfect fit while the quick release clamp adjusts to fit ø25.4 - ø34.9 mm seatposts. Advanced high impact plastic is co-molded to a flexible trailing edge for resistance to impacts. Both fenders feature a highly polished underside to prevent mud build up and aids in cleaning.