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Discussion and questions related to the course Motorsport Wheel Alignment Fundamentals
what is the best pressure tire for a semi slick one for having the best grip in a race?
In short, there isn't 'one', as different vehicles, suspension setups, wheel and tyre sizes, tyre construction, ambient temperatures, track/race type, etc, will all affect this. It's something you need to establish from testing for your specific setup and situation, but a good starting point will be what people with similar vehicles are using for that rack.
Most tyres have a minimum pressure recommendation of ~1.8 bar and often have a maximum marked on the sidewall, so somewhere between those?