I have been running the dunlop d209gp on my track 21 for about three years now, with no probs at all, and see no reason to change,(i wouldnt go any quicker if i had the best gp quality tyres on). I dont buy mine new,i get used scrubs off the superteen boys,the only place i have seen supplying them new is Dennis Trollope of Bristol,at a hefty £279 a set, in 110 & 150 sizes.
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Proud Father of , 05 ktm 400exc supermoto 2018 honda crf rx supermoto