20"x4.0 Fat Bike Front Wheel Double Wall Rim with Puncture Resistant Tire All Terrain Bolt On and Hub 36x12G Spokes Black Alloy Aluminum Snow Bicycle Folding Fatbike Wheel Assembly. 20"x4.0 Fat Bike Front Wheel Doubal Wall Rim with Puncture Resistant Tire All Terrain Bolt On and Hub 36x12G Spokes Black Alloy Aluminum Snow Bicycle Folding Fatbike Wheel Assembly.