ROC System fits sleds from 129" to 175" Quick release buckles for easy, gloved-hand operation Easy handlebar access for moving sled while covered. Ride on or off a trailer or sled deck while covered. Added protection while transporting sleds.REV Gen4 MXZ, Renegade, Backcountry or Freeride 137 / 146 with 1 + 1 Seat and Backrest, Grand Touring Sport, Expedition Sport