Bring your Piston Pro capacity to 3 or 4 bikes 99% metal construction OneTap levers make loading your bikes easy, and fun. FastFit Wheel Chock System allows for changing wheel sizes from 18" to 29" in seconds, tool free Semi-Integrated 12mm cable lock Stainless steel hardware. No frame contact 53" Max Wheelbase 5" Max tire widthNOTE: While the add-ons give you room for more bikes it affects the per tray capacity of the entire assembly as follows: The 1 Bike Add-On reduces the capacity to 50lbs per tray (3x50lbs) The 2 Bike Add-On reduces the capacity to 40lbs per tray (4x40lbs)
