Surly's burly line of tubular chromoly steel racks have been used on expeditions all over this planet for years. This Surly Rear Disc Rack is made of tubular chromoly steel and is specifically designed to fit frames with seat stay-mounted disc brakes like the Straggler (650B and 700c), Krampus, and Karate Monkey for the Standard model. The Wide model is specifically designed to fit fat bike frames with seat stay-mounted disc brakes like the Wednesday and Ice Cream Truck. - Tubular chromoly rack, stainless-steel hardware - Height-adjustable to accommodate 26-29" wheels - Hardware housed in reusable Surly Tool Bag