I've used MT21/22 on my XR4 for the last year (~4000kms and still plenty on them even after a baja and trailriding to work 2 days a week for 8 months. The rear is cracking a bit now around some blocks but the front looks fine. Didn't like the front on soft sand and loose rocks out in Qatar so would go back to a......
Mich AC10 for the front, very hard wearing but crap grip on wet tarmac or polished roads.
On the rear I'd go back to a desert (I was to tight with my cash last time!) for any serious dirt/off road distance in the sun.
Ultimately it comes down to what you want to do with it?? and trying to balance all the compromises, grip, wear, cost, strength...
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