* Integrated cable lock* Trail Doc compatible* Holds wheelbases up to 50Û and tires as large as 5Û* Composed of heat treated aluminum* Only for 2" receiver version+1 Add on : Holds 3 bicycles weighing up to 50 lbs each* -05: Black+2 Add on: Holds 4 bicycles weighing up to 40 lbs each* -03: Grey; -04: Black