Saris' Cycle-On 2-Bike Add-On attaches to your Cycle-On Pro rack (sold separately) to carry two additional bikes. You must have the 2-inch-hitch model of the Cycle-On Pro to add this kit to it.
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This is the absolute best bike rack I have ever owned. I can have 4 bikes on the rack and ready to go in less than 5 minutes, it's so easy my wife can even do it without any help. This is not a cheap rack but I don't mind spending a little extra when the quality is first rate.