Universal Doubletrack Pro Hitch Mount Bike Rack by Thule® Hold Up: 2 Bikes. Hitch Size: Fits 1-1/4" and 2" Receivers. This carrier offers the convenience and ease of loading of a platform hitch rack at a great value. The sliding wheel trays can accommodate virtually all wheelbases and tire widths, and the ratcheting hooks make securing your bikes as simple as can be.