You are correct (fixed your typo), supporting my prior explanation that the overall difference is almost exactly 1 inch... a little less if one is going from 255/55/18, a little more as compared to 275/40.

And no argument about the COG change either, it's a 1/2 inch higher with the 45 series. I actually mentioned this 1/2 inch lift in the wheel size poll thread: https://rennlist.com/forums/porsche-...heel-size.html

I'm not sure how much sidewall flex difference there really is between the 40 and 45. I have a feeling it's not much, and less of a difference as compared to the improvement from 255/55/18 to 275/45/20.

Handling differences? Well, I don't think we're talking about much. But I agree the 45 series is not the right tire if one is trying to shave seconds off lap times. However, compared to the 255/55/18 that I personally changed from, I really can't tell much of a difference in performance. If anything, if feels like it corners better. Perhaps wider tires + stiffer side wall outweighs the 1/2 inch COG lift (oh, and I added 15mm spacers in the back, also helping handling a little I suppose).

So I guess it's about defining one's goals, maybe the cosmetic improvement is worth what may be a virtually undetectable handling difference. I considered all this before making my purchase and read up on some similar experiences and opinions.

But hey, this is my first set of tires on the 20'' rims and I don't mean to sound defensive. I may even try the 40 series next and have more experience to share in the future... of course by then I might score some 10'' 20s and go staggered with 315s! (ok, probably not, I like to rotate tires, but I'm trying to get back on topic)

 

@ RacerX5 :



..Trying to show that the 315 on rear, ..just look right !

 

..Yes, now, since a "little problem" on the back door, one day, that the boat, together with the trailer, tried to enter on the car ! (*)
It is anonymous.
But, for many years it was like that :



Yes, all these years ..with 315 on the rear !

(*) Just to remember that this car have brakes ..that could stop a freight train !

 

The staggard setup will not benefit you at all. But having thinner and same size wheels will be much better.

 

@AlexPorsche : Very nice sentence, but : Have you ever tried ?
Did you ever tried towing something like 6'000 lbs with both configuration ?
I think, before writing, ..you should try.

 

You are probably right and it may be unfortunate that I actually notice the handling difference when dropping a GTS by 9 mm from normal to low ride height (without touching any of the other settings). I lament the fact that I will not put another set of P Zeros on any of my cars due to multiple reliability issues which I have personally experienced with them. The Michelin Latitude Sports are very good handling tyre, but unfortunately not as good as the Pirellis. Funnily enough the handling was what sold the GTS to me in the first place, so yes it's important to me.

Don't get me wrong, I like to keep my cars looking smart, cleaned, polished and attend to any defects, but I prefer to be on the inside driving than to be on the outside looking so a 1/2" fill up in the wheel arch means nothing to me and I'm not pandering to voyeurs.

Back on topic, I like the obvious staggered set-up that I have on the C4S but not sure that I've noticed it particularly on the CTTS. Perhaps it just looks subtly more aggressive?

 

GVA-SFO,

I might have missed it, but what size are you running on the front?
BTW, we have a twin titanium edition (w/ the same wheel option) separated from the factory.

The rear looks much better with 315 for sure.

 

@Pcst : Since day 1, I run on 275 x 40 on the front, with the OEM 20 x 9 rims

I can add (again) that 275's on (20 x) 10 wide rims looks awful, leaving the right rear rim fully unprotected to any curb contact, as the with such ratio, ..the rim is larger than the tire!

 

I bought a second staggered wheel set and mounted my winter setup (275/45 R20) on the 9x20" and my summer setup (295/40 R20) on the 10x20". Especially because I didn't want to run a staggered tire setup and because the rear 275s on 10" look dumb IMO.

 

Just curious - is there any problem running different diameters in regards to the center differential? I know some US vehicles will burn up that diff (GM big-***-SUVs) with new tires on one axle and worn tires on the other axle. A friend went through 3 diffs under warranty until I suggested this might be the problem. The dealer had changed both rear tires after he had a torn tire - but didn't do the fronts. Once the fronts were replaced with new - the diff burning up stopped.

Just saw: https://rennlist.com/forums/porsche-...e-forum/799319 - and yuppers. Different diameters are gonna cause problems.

 

@Deilenberger, sure it is good to recall this point.
Note that the real thing is to have the circumference of the tires to be identical, ..not the diameter of the rim !
And, this is not only critical for Cayenne, but also for all 4WD Porsche, like C4 or Turbo, ..that by the way have all staggered tires configuration.
For info, 275x20/40 and 315x20/35 have same circumference, so the central diff runs in optimum conditions.

 

Looks nice! Can you also provide front 3/4 view of your car looking very low from ground view perspective and straight side view? Much appreciated. I'm think about coming down from 22" to 20" to achieve a good stance. Thanks.

 

Those are directional tires so the ones on the right are mounted on the wrong side. If you want staggered setup with those, you need 4 different tires.

 

My cadillac srx comes with staggered tires from factory, its AWD.

 

@TozoM8 : No, 100% wrong : the the Vred Ultrac Sessanta are NOT directional, (but do have "inside" and "outside" walls position).