Fits tires up to 5.0", bikes up to 48" wheelbase, wheel diameter 20"-29" 3" of side-to-side tray adjustment avoids seat to handlebar interference 13" spacing between bikes allows clearance for all fat bikes, including those with Bluto forks and 197mm rear spacing 50lb max weight per bike with Add On (150lb max) No bike frame contact Compatible with MonoRail Swing and 2" MonoRail Lifetime warranty