we ran a prokart in a race here a couple of years ago and started with some very lightly scrubbed new tyres the kart was off the pace in qualifying and for the first 10 laps of the race as the tyres wore they gradually came in and the L/times dropped
The same problem was experianced by a cadet that we ran last bank holiday new tyres and again no grip.
old tyres were fitted and the lap times dropped
have heard the same thing occuring from a couple of other racers at that track so must be something in it
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