Opinions please - tyre/tire wear

[W1NGE]

This is primarily wear from low tire pressure. The tire in the first picture of your post is flat, or almost. I'll assume the car wasn't driven this way. Both tires are worn on both very outer edges. One side to the cords, the other very close to the cords (blow up the pictures and this is pretty clear). I can't tell from the pictures or your description but my guess is the inside facing edges are the ones worn to the cords. A little negative camber, really wide tires and low pressure and the inside facing edge wears first.

14,000 miles isn't really all that bad but given the tread left across the face of the tire you should have gotten considerably more. Always set the pressure cold and get a decent pressure gauge. Based on the info on Porsche's "Good to Know" you should be at 39 psi cold. The 40psi, cold, that Kwikfit set your tire to should be about right. Warm day, highway speeds and pressures will go to 44 psi. Don't adjust your tires when you get home after a drive.

First point of reference should be the b-pillar plate located at the bottom.. This matches the tyre and rims fitted when the car left the factory. Obviously if the rim size has changed then Owner's manual is the next reference.

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[Fish Fingers]

You said "outer edges" but is that on the inside side of the tyre (nearest the suspension) or genuinely outside (the outside edge of the car)?

There are a few threads on this, the exact same wear. But usually it's the rears.

A forming view (on here) is that the camber settings on the car go too aggressive when the ride height drops, which may cause it.

I'm also wondering if the NF0 spec might have something to do with it... I wonder what was specified for the side walls and tread softness and whether some sort incompatibility causes premature/odd wear... If camber were the sole cause, I'd have thought the general tread would wear more towards that side of the tyre. But it doesn't seem to.

To OP.
The reason people are asking if the shoulder wear is on the inside edge or not is due to this thread - and a common issue affecting members here.

Not sure if you are aware of it or not?

https://www.taycanforum.com/forum/threads/taycan-problem-potential-catastrophic-tire-failure.16788/

 

[Scandinavian]

No apparent balancing issues, no wheel alignment issues. The tire pressures have been set at the manufacturers pressure, or close too, it's difficult to tell with the app, car, and pump all giving different readings.

I am surprised that the app and the car display would show a different value for the pressure??

I have seen pump pressures deviate from what the sensors from the car indicate and have assumed this to be because the sensors also register the temperature. But I have not seen any difference on car display or app, if the app is updated. Strange?

Your first picture I assume you have a puncture or the car is standing on very uneven ground?? That tyre pressure would else be far too low.

Your tyres in one of the pictures also look very dry and with small surface cracks? But they should not be too bad, unless you loose pressure over time.

We have earlier seen different pressure recommendations stated on the plates in the car, with the same rims, Mission e, 21 inch, depending on tyre brand. Not huge difference, but a few psi. I assume the tyres are the ones car was delivered with.

I have the same tyres on my MY20 T and got nearly 24k miles (40k km’s) on my first set. Always set the pressure as per the cars plate and car display. I had vey even tyre wear when tyre was damaged by a pothole.


P.S. Kwikfit have incentivised your rears as Winter tyres in 21 inch dimension! ?

 

[tigerbalm]

This is just me ... but I'd always be too nervous about the carbon ceramic discs to go to a regular tyre changing place. I'm sure they are well used to them at this stage.

But when I watch my Porsche Centre swap over my winter/summer wheels – using the specified tool to ensure the wheels don't hit the discs – it is reassuring.

Pretty neat that KwikFit gives you an internet accessible report though. Even if they did select the wrong rear tyres as @Scandinavian mentioned.

 

[Remedy234]

Interesting read. It seems my 21” running at 33psi are way to low

 

[W1NGE]

Interesting read. It seems my 21” running at 33psi are way to low

Car at dealership for brake hose and heater recall. Cold tyres and should be 2.5 bar (36 psi) at front and 2.6 bar (37 bar) at rear for 2 passengers. 21" RS Spyders.

 

[Bennachie]

Interesting ........................... 38 and 40 for my 21" Goodyears

 

[kempez]

Interesting ........................... 38 and 40 for my 21" Goodyears

39 and 40 for mine

 

[gtm]

First point of reference should be the b-pillar plate located at the bottom.. This matches the tyre and rims fitted when the car left the factory. Obviously if the rim size has changed then Owner's manual is the next reference.

Actually I would consider the PCM values to be the correct ones. That is not static, which the door plate is, and should be specific for any individual car. In theory Porsche could push any revised pressure settings to your individual car. (That's assuming Porsche can push anything OTA). I reference Good to Know data, as we have no idea of OP's door plate or PCM data, simply to say that the Kwikfit pressure was probably pretty close to where the tires should be set.

 

[W1NGE]

Actually I would consider the PCM values to be the correct ones. That is not static, which the door plate is, and should be specific for any individual car. In theory Porsche could push any revised pressure settings to your individual car. (That's assuming Porsche can push anything OTA). I reference Good to Know data, as we have no idea of OP's door plate or PCM data, simply to say that the Kwikfit pressure was probably pretty close to where the tires should be set.

Manufacturer's manual states the plate.

OTA and Porsche aren't are great relationships.

 

[chun]

Car at dealership for brake hose and heater recall. Cold tyres and should be 2.5 bar (36 psi) at front and 2.6 bar (37 bar) at rear for 2 passengers. 21" RS Spyders.

For Turbos / Turbo S, on 21 inch wheels, 5 seats, the recommendations in Switzerland is 2.8 all 4; or 2.9 front and 3.1 back for full load.

 

[gtm]

Manufacturer's manual states the plate.

OTA and Porsche aren't are great relationships.

OTA and Porsche just don't belong in the same sentence. I realize that but still have just a tiny little bit of hope.

 

[W1NGE]

For Turbos / Turbo S, on 21 inch wheels, 5 seats, the recommendations in Switzerland is 2.8 all 4; or 2.9 front and 3.1 back for full load.

Like I said, whatever the plate says and covers both partial and full load.

5 seats is a stretch in. 4+1 (child) car.

 

[Scandinavian]

For Turbos / Turbo S, on 21 inch wheels, 5 seats, the recommendations in Switzerland is 2.8 all 4; or 2.9 front and 3.1 back for full load.

That is similar since a Turbo in France MY20 will recommend ( 4 seater)

Rear tyre 305/30 ZR21 104Y. 2.6 bar part load, 3.1 full load

Front tyre. 265/35ZR21 101Y. 2.7 bar part load, 2.9 full load.

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