i am surprised no one has mentioned panaracer trailblaster 2.1.they work great in mud, clay, sand, pinetags,and good terrain too.here in va. we rae over 20" above normal rainfall wise so i have ridden some horrible stuff this year.only problem i had was only got 500 miles before they wore out.we have that orange sticky like velcro mud and they throw it off like water.ive tried tioga factory,velociraptors,endororaptors,and vittorrias also and the trailblasters were the best BY FAR in poor conditions.ive ridden in snow this year,mud(up to your hubs mud),leaves, pine tags,sand,dirt,pavement,creeks,you name it in va.ive rode it this year on these tires and have been really happy.just got another set from cambria bikes for ONLY22 ea!the mud shedding was the most surprising cuz that orange crap usually only comes off with a stick or at 15mph or higher in your face.they are very predictable too as far as cornering and braking.if yoor used to being out of control on sand and loose stuff while cornering they will take some getting used to though(thought i was gonna slide,did not,wrenched my back)others may disagree but im staying with thes tires!