Introducing the Topeak Defender Rear XC 11 Mudguard. The sibling to the Defender M1 front mudguard the XC11 which carry’s on the same strong and flexible construction which allows for durability and strength. The Mudguard itself has a few points of adjustment which means that it can fit all bikes with ease and means that you can put the mudguard in its most prime position for full coverage. With a simple design the mudguard looks good on all bikes. make sure you get the correct size for your bike in relation to your wheel size.