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. FEATURES: All metal construction OneTap™ hydro-pneumatic tire arms for secure mounting with no frame contact Patented FastFit™ tool-free wheel chock system Capacity: 67 lbs. per tray on 2” 2-bike, 60lbs. for 1.25” version, 42lbs per tray when mounted to a chassis mounted RV hitch 53” Max wheelbase, 5" max tire width SPECS: Number of Bikes: 2 Bike Mount Type: Tray Designed for ebike: Yes Bike Weight Limit per bike: 67 lbs