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tire sizes for 99 996 in 18"

Wheels and Tires

Model: carrera, Year:1999, Mileage:71.5k, Type of use:Both Street & Track
I'm going to buy some 18x8 and 18x10 inch rims for my 996.... I wanted to use the michelin pilot cup sport tires... and wanted to know if using a 235/40/18 front and 285/35/18 rear is ok or whether the rears are too wide and scrub off too much speed via friction on long strait aways or even if they are too wide as to overwhelm the 235 front tires... I was thinking of going with 235/40/18 and 265/35/18 instead to reduce understeer... is this advisable...? I currently have ROW 030 suspension installed....thxPeter

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