ROCKYMOUNTS MONORAIL ONE BIKE ADD-ONIf you have a Rocky Mounts Mono Rail, you know it holds up to two bikes securely. If you have a third person coming along for the ride, you can change your Mono Rail into a three bike rack with the Mono Rail One Bike Add-On. It has the ability to be adjusted 3" side-to-side in order to optimize the bike offsets. The original Mono Rail is able to hold up to 120 pounds total, which translates to 60 pounds per bike. If you add the One Bike Add-On, that means you can carry 40 pounds per bike. Make sure you always load the heaviest bike closest to the vehicle. The Mono Rail can hold wheel sizes from 20" to 29" and up to 5" wide tires. Bring another friend along with the Mono Rail One Bike Add-On. Features Increases carrying capacity from 2 bikes to 3 bikes Adjustable carrier with up to 3" side-to-side Can fit multiple tire sizes from 20" to 29" | Rocky Mounts | Monorail One Bike Add-On | Black | 2" Receiver Rack Only, 1 Bike