I've got a set with over 250 laps. Should be close to 300 by the end of Saturday. When they were about 200 laps old I fitted a brand new set and went just 0.1 secs quicker at my local track. The kart does start to move around a little more as the tyres age but the lap times were still there. I suspect I'm going to run them for at least one meeting more than I used to the old ones. I don't know what the surface of bayford is like or what your kart is but I have run between 8 and 22 psi at different tracks. As a general statement, I would say go for the lower end of this range. I'm still learning with these tyres though
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