Bontrager's BackRack Classic is the perfect add-on for carrying gear on larger bikes. This rack works with mountain and hybrid frames 20 inches and over, and road bikes 54cm and over. You can strap goods to the rack or attach bags (sold separately) for additional capacity and convenience. This fine rear rack is made of tubular aluminum for strength and reliability. It also has a built-in shelf, which helps support loads, adds strength and acts as a mini fender. Tough and rustproof stainless steel mounting hardware is included. The BackRack accepts all panniers and is perfect for Trek’s Interchange bags, too (sold separately).