With the Towing Tray Combo, you can bring along another adult’s or child’s bike when you ride Bring along any bike with wheels from from 12 to 29'' with a tire width of up to 2.25'' Durable and tough Side bumper to keep the bike you’re towing from scratching your Mundo Includes a running board with a slot for the towed bike’s front tire A tire size adjuster and a bumper. Compatible with the Mundo Classic, the Mundo Lux and Electric Mundo only. 2-year warranty