With all the "is this tire good...." threads lately, I thought it'd be a good idea to start one single thread where we could all post reviews on the tires we've actually owned and ridden on in one thread. This thread could serve as a resource for seaching different types of tires. If it doesn't go to hell and stays on track hopefully a Moderator could sticky it at the top of this board. I'll start with what I've owned. I ran the Pirelli MT21 (120/80/18) on a Honda XR650L for about 800miles. They were both smoked after that amount of mileage. I ran about 16psi with rim locks and did probably 50% on 50% off with these tires. The worked well in the sand, but did have the front wash out occasionally (from what I gather it's more a characteristic of the BIKE and not the tire), overall I was happy with these tires. Avon Distanzia (Supermoto compound) These tires simply kicked ass. I went through my first rear in 5,000 miles and the front lasted me about 8,000 miles. I'd say 95% of that riding was done on Pavement and 5% of Dirt Roads, but they still worked very well on hard pack and even loose silt/sand on top of hard pack. The grip on the street is incredible. I had these mounted on my XR650L on 17" rims running 26psi Front 28psi Rear. I ran a 150 rear tire on a 4.5" rim. Pirelli MT83 aka Scorpion Pro (DOT approved) I've run this tire (Front only) on my KX250 and my DRZ400, I run rimlocks on both bikes and on the KX it's aired up to 14psi and I keep it up around 20psi on the DRZ (still run about 50% pavement so the extra PSI keeps the knobs from wearing too quickly). So far on the DRZ I've got about 500miles on it and it's held up great. Hooks up AWESOME in all terrrain that I've ridden, Sand, Rocks, Hard Dirt and even pavement. It's gonna be hard for me to try any other fronts. I have not tried the rear tire yet. Pirelli MT18HD (DOT Approved in HeavyDuty type only) I ran the 110/100/18 on the rear of my DRZ again for about 500miles. It's almost shot at that mileage, but I ran a lot of street miles on this tire, it could corner really well, the knobs don't flex, I could ride all the way to the edge of the side knobs on this tire. It worked amazingly well in Mud, Rocks and Hardpack even with street air pressure (26psi)!!! With that much air it was a little squirly on some of the hardpack dirt with roots and rocks, but otherwise a great tire. Dunlop 756 Rear (NON DOT) I got this tire in a 110/90/19 for free from a MX shop in RockyHill CT. Great tire, but wears quickly even riding 100% dirt. It worked well for me in Mud, Sand and hard pack dirt roads. It stuck well even climbing over a rock outcrop on a hill. Pirelli MT16 I have one of these in a 120/90/19 waiting to go on my KX. I will post up results in the future. I've had some other tires various half worn Dunlops and IRCs but didn't ride them for long before swapping out. As I get different tires I will submit future reviews to this thread.