My 2007 S8 has Pirelli Nero Zero M+S 275/35/20 all around. Has anybody used these tires on their S8 and, if so, what pressure did you run them at? I'm getting lots of conflicting info but all from people who haven't had these tires on this car.
Thanks

 

I believe that the manual in the 09 S8 has the pressures for the 275's listed. I will look later. Not near the car right now

 

S8's all seemed to come with the Advan Sports initially, and in 265's. Somewhere though they did migrate to 275's.

On W12's and upline 4.2's with the sport options and the 20" wheels, of course the 275's were used. The OEM choices in the US are the Dunlop SportMaxxes, the Pirelli summers (not the all weather), and the Conti 2's. But those Pirelli summers are almost the same as the M+S tread pattern wise and sizing specs.

The W12 and the S8 aren't that different in front weight, and a lot of the remaining weight delta is either the L body or weight of incremental options, motors, etc. Specifically on my 2006, for the 20" 275 fitment, the sticker is:

38 low, 41 high in front
35 low, 44 high in back

I have run at 40 front and rear, but just moved to 42-43 for a while to reduce edge tire wear a bit with MIchelin PS2's. Can feel it a bit in ride smoothness. My car has S8 roll bars but non sport air shocks (yours would have sport + shocks).

By the way, I think the 275 Pirellis are still the older version w/out all the little sipe lines like the newest ones. Having used those on my a6 4.2, they are pretty close to their summer tire tread wise, though do seem to wear longer like an all season. I like the tire, but it was more a check the box to get through a chain check in spring or fall than some of the all season tires. Would have looked hard at it if it had the newer sipes, but ended up looking at the new Conti and the revised Michelin for balance of more aggressive tread, road comfort and handling.

Finally know that by about 2007 the manufacturers all had to "roll over" on new tire sticker rules brought to us courtesy of the Ford Explorer. Thus if you find a car with the more classy silver Euro type stickers on the fuel lid (or sometimes buried by the drivers door hinge), it's the older one that really considered the car tuning. If it is the yellow and black one with some red, it is the newer NHTSA mandated standardized one. From some posts about the Phaeton tire presures I have read over time, it became clear at least there VW suddently upped the pressures to comply with the load ratings best. But, that of course doesn't mean best ride, wear or other variables. You may be running into that when you say you are getting different info.

Long story short, 40-42 lbs and I bet you are happy. In the 30's you risk side wall bubbles in front from sharp edge impacts with the weight of the car and everyday road stuff.