Why trust the safe transport of your bike to plastic carriers designed for short journeys on city streets? Front Runners all steel Thru Axle Bike Carrier was designed off-road tough to get you and your precious wheeled cargo to the worlds best trails using the world's toughest roads.Fits 100mm x 15mm and 110mm x 20mm Thru Axles, as well as 110mm x 15mm Boost Hubs. And for you riders that go big, the rear tire holder fits up to 4.5" Jumbo Tires.