Using your Topeak DeFender XC11 rear mudguard is a breeze. First, adjust the quick - release clamp to fit your 25.4 - 34.9 mm seatpost. Then, use the multiple pivots to set the fender at the best angle for your riding style. When you're done riding in the mud, simply remove the fender for easy cleaning. Make sure to keep the fender dry after cleaning to prevent any damage. Also, check the pivots and clamp regularly to ensure they're working properly. With proper care, this mudguard will serve you well for a long time.