TKC 80's handle well in gravel, light mud, sand and most other surfaces, however used at low pressure on soft sand with rocks they get cut easily and then you are stuffed as I was in Ethiopia when my rear cut opened up to a 3inch hole. Front TKC80 fell apart on Moyale/Isiolo road which is lots of sharp rocks, however a German guy had tubless TKC80's, (mine were tube type) and his are still OK, my R80 is monolever, his R100 is Paralever so maybe its down to better suspension as mine is standard front, bottoming and topping out a lot now and hagon rear which is ferked big time and now sports a car damper riding piggy back, should last to CT as its more or less tar all the way from dear ole Nairobi
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