i'm running 31-10.5-15 Firestone Destination M/T.they're good on wet pavement ,snow,mud,dig trenches in the sand so i wouldn't hit the dunes with 'em,steep dirt hills aren't a problem,seem to clean fairly decent, low to no road noise,only slight growl when coming to a stop, and rock crawling in this area of michigan is nearly non-existant so i haven't tried them in that area.Siskel n' ebert gave 'em /forums/images/graemlins/thumb.gif /forums/images/graemlins/thumb.gif!wait,that was someone else.but i'm pretty impressed so far,also,and they were $585 OTD,so i didn't think the price was too bad either.