OvalPiston

I have the stock Sport Techno wheels with the standard staggered widths of 9" fr and 10" rr with stock sized 275/40s on all four wheels.

I'd like to get wider rear tires so they don't look so "stretched".

Advice or recommendations on which tires to get for the rr and fr?

Corso

Just bump to 295 in the rear.

OvalPiston

But 295/40 have a different diameter than the 275/40

Matt O.

https://rennlist.com/forums/porsche-...iscussion.html

Corso

295/35

Matt O.

Not sure if money is a factor with your decision, but if you get different sizes you can't rotate. With the 955 notorious for chewing through tires, rotation was important to me. Discount Tire has no problem removing the tires from the wheels to rotate when that time comes (I confirmed this with them).

OvalPiston

The stock 275/40R20 on all 4 tires: 28.7" tire diameter

On http://tire-size-conversion.com/tire-calculator, the only other 20" tire sizes with a 28.7" diameter are 245/45R and 315/35R

mcbit

Better than the 295s are the 305/35-20s, these are only 0.3" different in diameter from the 275/40-20s and approved for use on 10" rims. i'm pretty sure that you won't suffer any issues with these.

Personally I would stick with the stock sizes.

Corso

Sounds like you've answered your question then.

OvalPiston

Although the 305/35s would be great, the 0.3" diameter difference might make a difference to the diffs and the 62%/38% rr/fr split of power, as they're expecting the wheels to rotate at the same speed as the fronts. The 315/35s in 20" dia - Cont's are only $70-$100 more per tire.

Crocodon

I have a 2006 CTTS with 9s at the front and 10s at the back. Same stock tyre sizes front and back.

What’s the point in having different rims front and rear if you end up putting the same rubber on them?

hopsis

No point at all. If they have same offset (or ET) number front and back too, You also have two different track widths now.

I could see the logic if this was a rwd 911 or some other car with flared rear arches and somebody wanted to get the tyre to sit as close to the fender as possible. Just for visual appearances sake. On a 4wd suv, pointless.

Maybe they were in a different Porsche before? If that's the case and they were meant to a smaller and lighter car, You should check if the weight rating is actually enough to support the Cayenne. It will be stamped in the inside of the wheel spokes someplace.

Crocodon

Offset is different- 60 front and 55 rear. The wheels are stock for the 2006 CTTS, so definitely done by Porsche intentionally.

hopsis

Well we know that Porsche designers and engineers don't do anything without a reason. When in doubt, trust the Germans.

nodoors

Hahahahahahahahaha... breathe bwaahahahaha

The best solution I have seen is to swap 2 of your wheels with another person with sport technos so that you both have all 4 corners matching. Staggered setups on a Cayenne make |zero| sense.