Kuat Piston SR 2" Hitch Adapter Description: The Kuat Piston SR 2" Hitch Adapter converts the Piston SR bicycle roof rack in to a hitch mounted option for use with 2" hitch receivers. Features: 2" hitch receiver for adaptation of Kuat Piston SR Roof Racks Solid steel construction Compatible with Piston E-Bike ramp Includes hitch lock for rack security Weight capacity up to 100 lbs. in traditional hitches; 67 lbs. in RV chassis hitches