This tire is phenomenal as a front and rear though I'm a little more enthusiastic about the front. These tires saw air temperatures ranging from 38F to 115F and ate it all up.

The previous setup on my WR250R was a Scorpion Pro FIM front and an MT-43 trials rear. The MT-21 front tire gives 90% of the off road traction as the pro FIM but doesn't get chewed up on the pavement. The front tire is currently at 75% after about 3000 miles of 75% dirt 25% street riding. It continues to perform like new under all conditions.

Lets face it, the rear tire doesn't hook up exactly like the old trials tire running 8 psi but it's a lot more fun and it never kicks out and surprises you. It's better than the trials in mud that's for sure, and so the rear hasn't held up as well as the front due to throttle wringing and has maybe 25% tread life left. In its current state I'd feel confident in everything except deep sand. I will probably still purchase the rear again since it hasn't let me down from single track to interstate.

No problems on crazy canyon switchbacks whether there's pavement or not - dips into banked turns ok. Top speed I saw on pavement was an indicated 87 MPH, no undue vibrations. From Oklahoma to California I had zero problems - dirt, mud, gravel, sand, DEEP sand, rocks, scree, boulder fields... all dominated with the help of the MT-21. All crashes due only to user error not weak tires. No pinch flats running 15 psi front 16 psi rear in all conditions, heavy duty Michelin tubes. I do recommend running these in the 15-18 psi range.

I will probably run these tires again even if I expect primarily street and gravel roads. Friend has one on the front on his KLR and also loves it.

Hats off to the revzilla team for getting this tire to me out on the trail exactly where and when I needed it. A phone call to ZLA placed from the middle of no where got all the details worked out.

Be sure to set front PSI lower than rear such as 18 psi front and 22 psi rear for street riding or else front tire will feel nervous. Handling on road is much better than most 90% dirt tires and turn in is smooth and handling is secure when leaned over. In the dirt these are much better than Trail Wings or other OEM rubber that most dual sports come with. On my XR650L the MT21s handle dirt well. No DOT tire handles mud quite as well as full on dirt tire but these are close enough and tread wear is fine unless you are a highway commuter.

This is mostly an off-road tire so I can see where it would wear quickly on road. I ride mostly off road when I can and this tire works great for that. I like to have fresh tires and at this price point I don't mind replacing tires often. I use them on my KTM 690.

I mounted these on my lightly loaded Husqvarna 701 just before doing the NMBDR. I found them to be pretty capable in mud and very good in sand but really squirrely on most forms of gravel. Since ADV bikes spend a lot of time on gravel that is a deal breaker for me. They have worn pretty well and the wear has been quite even; the rear is now Kaput at 1800Miles and the front is probably good for another 500. I tried various pressures. At lower (~20lbs) they were squishy and squirrely. At higher (29lbs) they were bouncy and squirrely and at medium (26lbs) they handled best. The front tires seems to deflect off of rocks, especially now that it is worn. Now at 1800 miles I have cracks at the base of 100% of the rear knobs although I haven't chucked any yet. The on-road performance is OK but now that they are worn I won't be leaning into any canyon curves. In conclusion: I think these might be an OK selection in sandy and slightly muddy areas. Here in the SW and in the Rockies these are not recommended. the TKC80 is a better all around tire and the D606 is much better at off-road.

When I bought my bike it was used with worn out tires when I put the mt21s on it was like another bike

I have found the MT21 Rallycross tire to be an outstanding tire for the front of my DRZ400S. I always run this tire in conjunction with a Dunlop 606 rear tire. This combination gives me all the confidence I need in the sand, mud, gravel, and asphalt of the Georgia, North Carolina and Tennessee mountains.