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- all I need to know is if they should be 16", 17" or 18" ones to give best performance on a track?
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You ask the impossible. You could put crap tires on any wheel and go slower or great tires on any wheel and go faster. Bill gives you some good options with respect to tires and the wheels you should use with those tires.
You realize it is the tire size and not the wheel size that determines what your speedometer says and impacts acceleration given the transmission gearing? As Bill says, it's likely that your car expects a 25" diameter tire. Deviating from that is going to be what causes changes in the speedometer reading. Smaller means the speedometer reads fast and it is slightly easier to accelerate.
I reiterate: you need to decide what tires you want to run and buy wheels that are appropriate. Most choose MPSC, RA1 or R888 on 17" or 18" rims.
For a non-pro driver, I don't believe that the sidewall size/flex is going to have a significant impact on your lap times. I also believe that most intermediate level drivers will not see a profound difference in lap time with the tire options mentioned. Decide what you can afford in terms of the tire and light weight wheels and go for it.