Hope this doesn't sound condescending but- Are you new to Rotax or new to karting? If the first - then it depends what level you are racing at. For decent level Clubbies two meetings and two practices before changing should be Ok but I would recommend using two sets of wheels so you get the two race meetings consecutively then downgrade them to practice tyres. If you are new to karting, unless you are genuinely gifted and already just looking to shave the last tenths or hundredths, my advice is to put your wallet back in your pocket and run them until you really notice a deterioration in grip once they come on (try and separate this from grip deterioration of the track or you will be buying three sets a day!). There is normally much more time to find in your driving than in your tyres.
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