Fat Bike Tire Tube Protectors – Mr. Tuffy 4xl (Fits: 26″/29″ X 4.1″-5″) Review Posted on January 25, 2019 By DuskunkTagged Cycling, Mr Tuffy Liners, Outdoor Recreation, Sports & Outdoors, Tubes This fits your . Make sure this fits by entering your model number. Designed specifically for Fat Tire Bikes