When we're packing bags and planning logistics for a four-person, cross-country trip to a storied desert trail system, there's a whole lot of snack money to be saved by expanding our rack's carrying capacity with Kuat's NV Base 2. 0 2 Bike Add On. This accommodates everyone instead of shelling out gas for a whole extra car to tote those two extra bikes. Expanding your 2-bike NV Base 2. 0 into a 4-bike capacity, this add-on features adjustable cradles that accommodate wheelbases up to 48-inches and tire sizes ranging from skinny road slicks up to 4. 8-inch fat tires. It also includes integrated cable locks for peace of mind at travel day cafe stops.