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Originally Posted by yudalicious
too bad grip is a function of compound and weight, and bigger tires don't necessarily mean more contact patch, in other words, your answer is wrong.
I am with turtl, I'm also curious why people run such big sizes, is there a benefit that we're not seeing here?
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How is that wrong? and stop repeating what we already know. Why do you think people upgrade to a wider tire. If you take a tire that is of the same compound in a 225 and a 245 which do you think will give you better traction. Of course you can go overboard if you put an excessively wide tire that will hinder performance ( for example a 255 tire on a underpowered AE86), thats why you test different sizes to see which one gives you good grip without creating too much tire weight and rotational inertia. Go to an autocross event and look at the rear tires of a porsche 911.