Topeak Uni Super Tourist Fat Tire Rear Bike Rack This one-size-fits-all aluminum tubular rear rack is designed exclusively for Fat Bikes with disc brakes. The rack legs are adjustable to fit most 24î & 26î wheel Fat Bikes. The integrated side bar provides a lower pannier attachment point allowing more space for cargo on top of the rack. The MTX QuickTrackô plate is compatible with any Topeak MTX TrunkBag, MTX rear basket, and most other rack packs and panniers on the market. Not compatible with asymmetric rearstay design fat bike frames. For 24î & 26î Wheel Fat Bikes