Originally Posted by chip-3door
There is no point doing calcs to the nearest .1 of a mm when tyre treat depth goes from about 7mm down to 2mm normally anyway!
Every point Chip thats the correct maths & maths rule everything.
Tyre wear would then be taken into account. I do this before every Topspeed run cos at 200mph it can make a 2/3 mph difference between new or worn tyres.
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ps. Dont help the lad asking the question though hes had 10 different answers so far
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