V999

The profiles of the 2024 22” tires are one step taller both front and back. So overall diameter on 2023’s will be a bit larger. Presumably that’ll have an impact on speedometer accuracy. The calculator at 1010 tires is excellent for computing this stuff:

https://www.1010tires.com/Tools/Tire-Size-Calculator

2023 models with 2024 22” tires will, due to profile differences, have the following speed variance:

Front = 3.76% too fast.
Rear = 4.21% too fast.

I have no idea how to figure the actual speedo difference given staggered tire sizes with different speed variances. Maybe average of the front/rear percentage difference?

I think the rule of thumb is to keep diameter differences within 3% or less to avoid problems. So it seems using the 2024 tires on pre-2024 models might result in issues, maybe ABS or stability control issues.

pinion

I did a little research in this previously.

https://rennlist.com/forums/cayenne-...l#post18767310

Based on what mine shows at 80mph indicated vs the ‘your current speed signs’ switching to the 2024 tires would actually make my Cayenne speed accurate.

jtsmith18

I’m with you, I don’t think it will be an issue.

LDT

When https://rennlist.com/forums/members/107538-schnave.html rolls out of the rack….he'll know the answer.

Schnave

Sorry @LDT, I don’t know for sure but I’ll give it my best guess based upon limited research time due to ongoing project (see my post about hauling 2 x 12’s) 😀

— Regarding Porsche Traction Management. I think it is manufactured by Hella, but can’t confirm. No info on Hella but good info from Bendix:

​​​From Bendix:

“The Bendix system requires the tire REVS-PER-MILE TOLERANCE for all tires on the vehicle be within 3 percent of the smallest tire size on the vehicle.”

It does not say 3% of OEM tire size, but 3% of the smallest tire size on the vehicle. Did Porsche add some secret sauce to the system that would be affected by >3% change? No telling.

https://static.nhtsa.gov/odi/tsbs/20...15571-9999.pdf


— Regarding speedometer error: The larger tires should decrease the (higher than actual) speedometer error and improve accuracy. EU regulations state that in no circumstances can the actual speed be greater than indicated. Therefore, manufacturers error in favor of indicating higher than actual.

https://www.thrillist.com/cars/your-...-japanese-cars

— Regarding handling / suspension: Suspension geometry is one of the dark arts. This layman cannot tell you if/how larger tires will affect the 9Y0.1‘s handling. Will there be different alignment specs for the larger tires on the MY24? Do the new wheels have different offsets? Will those possible differences really matter on the street?

LDT

@Schnave Measure twice.....cut once!

V999

I'm not sure cutting or carpentry in general, what with it's frequent use of nails and screws, is the most ideal cliché to use when discussing expensive tires.

Probably a lot of us have had the experience of getting a nail through a relatively new tire at least once in our lives. I had it happen twice in 3 days w/my 991.2 GTS rear tires. Ouch.

I'm guessing the 22s are gonna run around $2K on Tire Rack. Sign me up for the wheel and tire protection package, please. LOL

V999

Another bit of info for those choosing wheel sizes on '24 Cayennes...

Tire Rack just listed N-spec 22" all season tires. Yokohama Advan Sport V35As at a cool $3914.08 for the set. V-rated, so capped (safely) at 149mph, just in case, you know, some of y'all were looking to track your Cayenne's.

I know we're talking about expensive cars and all, but I'm kind of hoping the all-season options for the Cayenne 22" wheels drop a bit once there's more than the single option.