Avon or Mitchelin
On my R80G/S I find Avon distanzia fine on the road, I get about 12,000 miles from a rear, 20,000 from a front, for gravel roads Mitchelin T63 are pretty good but only about 6,000 miles from a rear and 10,000 from a front.
This is changing them with about 2 or 3 mm of tread left. I think the best alround compromise were the old Avon gripster, still listed in 130-17 and 90-21 sizes but I am not sure of availability.
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