The Thule Accessory strap kit features 4 rubber straps that secure your bike frame into cages/cradles of your Thule Vertex or Apex bike rack.
Your fat bike will fit fine on the Yakima OnRamp hitch rack (not included) with the addition of these Yakima OnRamp FatStraps.
Like seatbelts for your bike wheels, the Thule Wheel Straps hold your wheels securely in place on the rack. They ratchet down tight so your steed won't budge