Thanks Viffermike for your input. I do have a set of 19” wheels that I will be using with Michelin’s Cups 2 during “special” days.
As far as the 20” oem wheels I think I can get away with the Michelin’s ps 4s in 245/35/20(f) and 275/35/20(r) which have a xtra load index of 95 and 102 respectively but the front and rears are not N0 spec. This is a huge improvement over the stock Pirellis that are standard load of 88 & 95 and better than the Michelin’s ps 4S in the stock oem sizes of 235/35/20 & 265/35/20 which have xtra load index of 92 & 99 and are N0 spec.
Do you know if the 10mm wider wheels(f & r) with the same aspect ratio of 35 and the resulting .3” larger diameter is significant enough to have any negative effect on the different Porsche systems, even though the relative ratio front to rear stays the same at -3% for both sets of 20” wheels? This difference in sizes is similar to new thread at 9.5mm vs used tires with less than 2mm thread. I don’t thing this is enough of an increase in diameter, specially being the same front and rear, to cause any ill effects on the car behavior, but will like to here your opinion.
My last result will be to go oem sizes on the Michelin’s but it might not be enough of an improvement in load index to be reasonably safe, specially considering the acquisition price of over $1.5k.
As far as the 20” oem wheels I think I can get away with the Michelin’s ps 4s in 245/35/20(f) and 275/35/20(r) which have a xtra load index of 95 and 102 respectively but the front and rears are not N0 spec. This is a huge improvement over the stock Pirellis that are standard load of 88 & 95 and better than the Michelin’s ps 4S in the stock oem sizes of 235/35/20 & 265/35/20 which have xtra load index of 92 & 99 and are N0 spec.
Do you know if the 10mm wider wheels(f & r) with the same aspect ratio of 35 and the resulting .3” larger diameter is significant enough to have any negative effect on the different Porsche systems, even though the relative ratio front to rear stays the same at -3% for both sets of 20” wheels? This difference in sizes is similar to new thread at 9.5mm vs used tires with less than 2mm thread. I don’t thing this is enough of an increase in diameter, specially being the same front and rear, to cause any ill effects on the car behavior, but will like to here your opinion.
My last result will be to go oem sizes on the Michelin’s but it might not be enough of an improvement in load index to be reasonably safe, specially considering the acquisition price of over $1.5k.
