When I first got my griz I noticed a lot of mud etc. would get on the front part of the rear fender, and all over me also. The first thing I did was put a set of small mudflaps on the front fenders to try to stop some of it, really didn't work, they would have to be much longer and then they would get torn off backing up. Thought about it for a while and came up with this solution, like night and day now, no more mud being sprayed all over me and the rear fenders, works like a charm.