I haven't seen a recent post on this topic, so I'd appreciate an updated response. I live in MA and changed to Porsche 19" wheels and tires yesterday. I am interested in the best handling for street driving and am somewhat indifferent to tire wear. So what would the ideal front and rear pressure be?

 

I would suspect that putting the most rubber on the road is best. That would be 31psi front &
34psi rear. Bear in mind, that would provide the best traction but not protect your wheels or tires from pot hole damage. If that is concern, I would suggest 36psi front and 39 psi rear. Temps are standard at 68 degrees, adjust up or down depending on ambient.

 

Not sure if this helps but my winter 20's were pumped to 33/39 per dealer. Tech advised these were the Porsche recommended pressures. 19's are prob different tho so I probably just wasted 28 seconds.... GL.

 

I'm running 33 and 31 on my 19" winters as per the pressure Tirerack set them at. They rocked today in Chicago's first snow of the season!