Originally Posted by henna gaijin
Porsche spec for the 20" tire is 275/40-20, not 275/45-20. You will find no N-spec tires in 275/45-20.
Porsche recommeds tires for the Cayenne be from 28.7" to 29.5" in diameter.
The 295/45-20 tires you are contemplating are 30.5" in diameter.
Just so you know.
WHat is the GEMBELLA 750 run?...
Having done lotsa "upping" in tire sizes in many trucks and cars...1'' is nothing.
It equates to 12.6mm diferance from center hub to out side tire, ie: will raise the pepper by 1/2 and inch.
That diferance i would think will have little to no change on the sensors (ABS and stability programs) and just a hair change to the speedo.
I would check the possibility of contact of the inner wheel well and the inside tire.
Only real good way to check is with a stress test,( AFTER YOU CHECK FOR CONTACT at a stand still) Clean the inner wheel well and take for a spine.....drive hard into corners and apply full brake.
If thiers a tad of contact a small wheel spacer may do the fix.
Good luck......the Pepper really needs larger tires!!!!