The thule rideon 3 is a compact 3 bike towball carrier that has patented towball coupling which allows for safe and rapid mounting it uses wheel mounting attachments on adjustable holders with quick release mechanisms this car bike rack is compatible with all wheel dimensions for years thule have developed products to meet the demands of the international 39city crash39 standard all thule products come with a 5 year warranty the thule bike rack is a superb option for transporting you