Actually I equiped my 640 adv with the K60 for my planned trip from Ulan Bator to Magadan, but had to cancel my trip for this year. I have the experience with the R100GS, I used them for approx 10'000km, they were still good for road use. Changed them in Mongolia for a new set, had then K60 scout. The back one lasted only 5000km, mostly off road (mongolia, kazakstan, kyrgystan, Tadjikistan).
So it seems that off road they are less durable. But the R100GS was 60kg heavier as well.
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