The mud flap is actually a good idea as rubber dampens impacts better than metal. All of our sander spreader wheels and street sweeper fans now have rubber on them and the wear has gone down by better than 75% since the "sand impact" has been diminished by the rubber instead of hitting directly on the metal surfaces like a sand blaster. If you have a blow out, the tire pieces hitting the rubber will collapse energy much better than a piece of aluminum.
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