Dont want to get into this again, but again your wrong.

-Nick

 

You still sound skeptical, let me expound further:

The Original Equipment sizes selected by Porsche for the Cayenne include the following:

Tire Dimension Load Range Load Index Diameter (inches)

255/55R18 Extra Load 109 29.0

275/45R19 Extra Load 107 28.8

275/40R20 Extra Load 106 28.8

Therefore, Porsche engineers were looking for tires with a minimum load capacity identified by a 106 Load Index with an approximate overall diameter of 29-inches.

While the 315/25R23 maintains an equivalent overall diameter of 29.2-inches, its load index is only "102" which indicates it is rated to carry significantly less than the lowest Original Equipment tire.

315/25R23 Extra Load 102 29.2

The simplest way to confirm equivalent or greater load carrying capacity of replacement tires is by comparing their Load Index vs. that of the Original Equipment tires with the lowest load index.

It is also important to recognize that passenger sizes used for light truck applications have reduced load capacities that differ from what is branded on the tire's sidewall and possibly from what is printed on the tire data page provided by the manufacturer. As a result the industry has ruled that on the max load capacity of a passenger rated tire used on an SUV be reduced by 9%. The Original Equipment 275/40R20 Extra Load "106 Load Range" tire would be rated to carry 2,094 on a car, but is only rated to carry 1,903 pounds used on a light truck like a Cayenne (resulting in a two-tire total capacity of 3,806 for the axle (102 pounds more than required by the vehicle's rear gross axle weight rating). The 315/25R23 Extra Load "102 Load Index" tire would be rated to carry 1,874 on a car, but is only rated to carry 1,703 pounds when used on a light truck (resulting in a two-tire total capacity of 3,403 for the axle (**298 pounds less than required by the vehicle's rear gross axle weight rating**). While I was directionally correct, I actaully FORGOT to reduce tire load capacity by the 9% (which caused the 23-inch tires to be considerable below the axle weight rating, rather than slightly above it. Again, this is before any people or cargo is even added to the equation.

Additionally, the Original Equipment tire with the lowest sidewall
(275/40R20) has a section height of only 4.4-inches. Installing the
315/25R23 would reduce the tire's section height to just 3.1-inches, and significantly increase the probability of a road hazard or pothole causing tire and or/rim damage.

Cayenne S example:

5746 Gross Vehicle Weight Rating
3208 Front Gross Axle Weight Rating
3704 Rear Gross Axle Weight Rating

And, upon looking further the 305/40R23 I had suggested before has an overall diameter of 32.6 inches. I believe it would prove too great an increase without body and driveline modifications. Being that Rinspeed is a reputable Porsche tuner I am assuming that the wheel is TUV approved for the truck. But if they have approved that for this fitment there HAS to be limitations (only two passengers, etc.) that we would like to see.

The weight of the truck is finite, and so is the strength of the tire. And in this case they don't add up to a safe fitment. If you think we are wrong, please provide why you think so.

 

nah, i am on a spending hiatus...

i used the term "next" to be cool, like "that's on some next sh*t, dog."

hey, btw, how do i get a new avatar, mine is so 2 years ago!!!!!

 

waiting on feedback,,,so damon with the 305/40/23 it still will be no good with 4 people in the car

 

Awesome wheels, mine took a while to arrive but finally got sorted out. Thanks to Red Line Motor Group.

To Bigdog: The first one is the Gemballa 22 and the rest are the best , plus one interior shot with CF.

 

buzz, very nice CTT. The brakes look so small insde those 23"

 

I really don't understand all this "load rating" stuff...

My CV6 with a full tank of gas and 4 passengers weighs about 6000lbs. Add a full load of camping supplies, 400lbs and 200lbs on the roof and that makes 6600 lbs really FULLY loaded. That's 1650lbs per tire. The 103 rated tires are at 1874lbs at 51 p.s.i. so it seems to me that unless you're TOWING or something ridiculous like that, that 102/103 load rated tires should be considered the minimum.
And honestly all the lowered and tricked out Cayennes out there will never have that kind of load ever.

The strongest argument is that every time you pull into a parking lot or mall or whatever, if you clip the curb gradient ever so slightly you can bend the rim on a 23"... nevermind the potholes!

But I think using the load rating argument against the 23" is a bit weak.

 

Just for note...


Nitto now makes a 295/30-23 in a NT555 tire. It's received good reviews from people who've used the 285-30-22 NT555, as good as the BFG most have said. It is rated as 104W or 1974lbs Max rating...

ALSO, it is 29.9" tall, identical to the 285/35-22 and has a better sidewall for impacts and the NT555 has a nice rim protector strip and a 295 on the 10.5 wheel will be better "curb protected"...

Might make the 23" a bit more popular.

OH, and btw Antera makes the model 325 in a 23 x 10.5... it's an ok looking wheel @ $700/ea. That and the Nitto's may make an interesting combo.

 

those calipers are way lame but the wheels and the look is uber hot

 

Yup, this is the car I saw today. Looked evil!

 

Sorry, it brings to mind a line from Clint Eastwood in the movie the rookie.

 

23" wheels are silly and look like crap on a Cayenne....

edit: Not meant to offend anyone who has wheels this big...but...it looks strange on an SUV with rubber band size tire side walls and the tiny brake discs...

 

All wheel with fan belt tires, I like it, but I would be concerned with the first pothole.

 

Ok I just recently ordered a these rinspeeds and now this thread is scaring me.... so am I gonna die with the rinspeed wheels and the tires designed for them or not?

Peter-

 

Anyoonnneeeeee????