Originally Posted by
Koyote
No. You'll get tired of the sound of pebbles rattling under your fenders...and the worst-case scenario is a larger rock or twig or something getting jammed between tire and fender and causing a crash.
Just wash your bike if it gets dirty.
I guess some people are super sensitive because for me personally the noise from small pebbles hitting my fenders has never bothered me. Also in my almost 20 years of riding on gravel and dirt and singletrack trails I never had anything get jammed between the tire and the fender that would cause me to crash. Fenders are not about keeping my bike clean but about keeping myself clean.