calamaridog said:Scott,
The MTR's have a loyal following out west where there are lots of rocks. They work very well on the rocks. Most people I know who use them are less worried about mileage and more worried about trail performance. These are aggressive tires and there are compromises for performance.
I have also not used them personally, but I know a ton of people who do run them and love the trail performance. From what I've seen, they work well and are very durable.
Well all I can say about the MT/R is it`s an average tire at best. I do a lot of desert and gravel driving with some occasional Jagged/Lava-type rock climbs. Dont spin these tires on rough rock or the tread will chunk instantly. After only 1500 miles on mine, I have a quarter-sized slice missing from one sidewall all the way down to the cords, Many small pieces of rubber missing from the lugs, and various cuts along the tread surface . Obviously, this threw the balance off pretty bad, so they vibrate endlessly.
This damage was mainly after a weekend-long run up some very ugly (abrasive) rock hills and high speed runs through gravel washes.
I will never claim to be easy on my 100, but the compound of these tires is just too soft for the type of wheeling I do.

Oh, one last comment....I was in Southern Utah last weekend after a mild snowstorm and the snow had melted on the road, turning it mushy with maybe 2or 3" of mud on the surface. The tread filled up with mud quickly, and would not clear out for the 15-plus miles of driving. I was slipping and sliding the whole time, even after lowering the pressure to about 14 PSI . The mud finally cleared out after I reached about 35-40 mph on pavement....What a mess that was !
