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Originally Posted by Adam
I'm a bit confused. Are pilot sport rib the same as standard Pilot sports? Porsche used PS1's as OEM equipment. Why not use the PS2's? I believe Porsche is still using the 265 and maybe the 225 18 sizes on the 987 and the Cayman.
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Actually they produced 2 version of the Pilot Sport (PS1), the N0 was the older, directional tread.
The N1 has a hybrid tread, much like the MXX3 on the Pilot Sport (PS1) carcuss (sp?). The Pilot Sport Rib is what the N1 Pilots are called here in the US.
The 18" sizes on the 987 S (and Caymen S) are 235/40x18 and 265/40x18. Since they have a different rolling radius, front to rear, I suspect the PASM (PSM) system has been recalibrated to accommodate this.