Topeak defender mudguard set xc1xc11the topeak defender set xc1xc11 2012 is an elegant lightweight and compact removable rear fender a secure quick release clamp adjusts from 254 to 34 9mm while multiple pivots articulate the fender for a perfect fit high impact plastic is co molded with flexible material for greater durability and the highly polished underside helps prevent dirt buildup and aids in cleaning featursattachments qr slip joint clamp fits 254 34 9mm seatpost adjustable