if you have registered the KUAT rack with KUAT, they will mail you for free the 20-24 inch wheel adapter. That's what I did last June. I bought the NV 2.0 base from REI as well and backordered the add on. Took about 2 months for the add on but finally got it. I suggest adding the KUAT pivot V2 swing arm as well. 4 bikes racks are cumbersome.
... View more