Ideally suited for fat tire machines with its 5. 5 inch width, the Portland Design Works Dave's Mud Shovel Fat Bike Fender blocks trail grime and mud from caking your bike and spraying you. Its durable plastic design uses adjustable rubber mounting straps for easy installation along the down tube. There's also a seatpost mount for extra protection from puddle splashes along your backside. And because it's riveted, you'll find that it breaks cleanly in the event of a trail mishap or serious crash to prevent damage to the fender itself. Additionally, you can trim the fender to fit smaller frames, should you opt to use this on a standard mountain bike.