The De Fender M1 is compatible with all front forks including tapered steerers. The unique quick release attachment system integrates seamlessly.XC11s rigid lightweight frame is a visually modern rear fender. Multiple pivots ensure perfect fit & coverage. High impact plastic is co-moulded to a softer trailing edge for greater durability. Rear fender fits all diameter posts M1 27.5/29 Front: 208g XC11 27.5 Rear: 215g XC11 29 Rear: 220g