The Piston Pro features some of the same great features as The Piston Pro X minus a few bells and whistles. Features like all metal construction, OneTap hydro-pneumatic tire arms that make no contact on the bike frame, and tool-free wheel chock slides.All metal constructionOneTap hydro-pneumatic tire arms for secure mounting with no frame contactPatented FastFit tool-free wheel chock systemCapacity: 67 lbs. per tray on 2 2-bike, 60lbs. for 1.25 version, 42lbs per tray when mounted to a chassis mounted RV hitch53 Max wheelbase, 5" max tire widthItem SpecificationsBike Mount TypeTrayBike Weight Limit (per bike)67Designed for ebikeYesHitch Type2" ReceiverNumber of Bikes2Tilt/SwingTilt Kuat Piston Pro Platform Rack Hitch Bike Rack UPC: 857373008702