Fred,
Im running 285/35/22 With Michelin Diamiris.. that is the only size they make in the 22.. The Dunlop SP 9000 is nice looking tire, but I don't believe it is load rated for the Cayenne.. Also another guy I know put 315's on his Sport Technos... so they will fit.. but he didn't like the look for some reason..

 

I went to the TechArt website and they advertise the following for the 22" wheels. So looks like 295's do fit.

5-Spoke-Monobloc wheel, mineralsilver
Tires 295/30 ZR22

 

22,s are definitely the way to go a cayennes....they fill the large wheel openings nicley

 

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