i have used bridgestone 090pros on my 250s for tha last year or so and they have been great (road use)
recently needed a set of tyres for the rgv so i tried a pair of gpr 70sp found they made the bike very twitchy and front end nervous(may need a bit suspension adjustment) on the road will see what there like at llandow on the track
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Half the strokes, twice the fun