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you have exceeded my knowledge of appropriate tires...
the only input I have, is that I like the oem bridgestone trailwing 19/18 on my dr200 (they are different from the dreaded deathwing TW41/42 on the dr650)
...because they stuck well enough on street to do a supermoto day:
and urban adventure wheelios down the streets of long beach
and well enough in the dirt to do (moderate) hill climbs:
so for dirt roads, I'm sure they'd rock out