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That's a VERY complicated question really. (I think) & I'm sure there's a lot of guys that can do a better job than me at answering...
It depends on engine power, suspension setup, and what type of course you're running.
I've seen a lot of guys throw big rubber on for looks but lack big power so they actually get slowed down. My car is a narrow bodied early car. Street tires are 205 50, they look OK but I REALLY like the look of my 225 45 R15 track rubber. I run the 225s all the way around and I love the grip I get when I auto-x. I am doing my first DE @ Mid-Ohio next weekend. I've been asking the same question and most guys with experience tell me that I'd probably be able to better max-perform my high speed turns with slightly LESS rubber up front. Which makes sense when you discuss the dynamics of it all.
Maybe Grady, JackO, or Tyson will respond. I know they have experimented with different setups and know more...
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Richard W.
Red '70 E, 2.2
White (w/ Red & Blue), '82SC, "Frankenstein" -a bit tweeked
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