If you want the flexibility to use the Thule trolley with multiple bikes, you can order the optional axle attachment kit, making it easy to change the towing bike. Quick link axle length: 170mm of which 27mm thread. The package includes a quick-release axle for the rear tyre of the bicycle and an attachment for the bicycle handle of the trolley. Compatibility Thule Chariot Cheetah, Thule Cadence, Thule Chariot Cab, Thule Coaster XT, Thule Chariot CX, Thule Chariot Cougar, Thule Chariot Captain, Thule Chariot Corsaire, Thule Chariot Cheetah XT, Thule Chariot Cross, Thule Chariot Lite, Thule Chariot Sport