Transports up to 2 bikes. Compatible with 1 1/4″ and 2″ receiver hitch. It has a built in anti-woble hitch device. Upright ratchedt arms easily adjust to different bike frame sizes. It will accomodatge bike framse up to 59cm. The center arm folds down to allow acccess to the rear of the vehicle without removing the rack. Fits 20: to 29″ tire sizes. Locking hitch pin required by the manufacturer is item No. 64029.