Taycan Problem - potential catastrophic tire failure

[Fish Fingers]

What I can't understand is what driving condition leads to wear of the tyre shoulder (over and above the main tread)?

• I thought 'progressive' driving typically affected outer (not inner) shoulders.
• Low tyre pressures would surely get both shoulders (and I keep my pressures slightly above average)
• Is it just straddling speed bumps (in which case I'll stop) or else how does this inner shoulder get worn so much faster (and consistently) than the main tread??

I don't think there was ever any definitive answer to this.....

It happened across Taycan models/tyres size and brands/geographical locations/climates etc.

Mine for one was not caused by speed bumps (as I don't encounter many).

I think the only conclusion was that driving in lowered settings (inc Range) may have some impact.

Anyone else, please feel free to add any other insights.

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[Midlifecrisis]

I think they've raised the recommended pressures now... Door jamb stickers are out of date on J1.1s.

Where is this info? They haven’t bothered to tell everyone

 

[Bognar67]

Avoid range mode. That's all what we can do and never let the pressure go below the advised + a little extra psi.

 

[SoccerMan94043]

Where is this info? They haven’t bothered to tell everyone

https://www.taycanforum.com/forum/t...nflation-pressures-updated-feb-28-2025.25456/

 

[Midlifecrisis]

https://www.taycanforum.com/forum/t...nflation-pressures-updated-feb-28-2025.25456/

Thanks. Pressures in that document are the same as they have always been for me. No change.

 

[acull2000]

https://www.taycanforum.com/forum/t...nflation-pressures-updated-feb-28-2025.25456/

Great link, doing some digging and there seems to be a string of TSBs on tyres:

J1.1

• 25/2/19 https://static.nhtsa.gov/odi/tsbs/2020/MC-10172034-0001.pdf
• 18/3/20 https://static.nhtsa.gov/odi/tsbs/2020/MC-10173044-0001.pdf
• 29/6/20 https://static.nhtsa.gov/odi/tsbs/2020/MC-10176857-0001.pdf
• 25/1/21 https://static.nhtsa.gov/odi/tsbs/2021/MC-10186472-0001.pdf
• 12/3/21 https://static.nhtsa.gov/odi/tsbs/2021/MC-10189831-0001.pdf
• 20/4/21 https://static.nhtsa.gov/odi/tsbs/2021/MC-10191743-0001.pdf
• 15/6/21 https://static.nhtsa.gov/odi/tsbs/2021/MC-10198933-0001.pdf
• 23/7/21 https://static.nhtsa.gov/odi/tsbs/2021/MC-10199858-0001.pdf
• 22/10/21 https://static.nhtsa.gov/odi/tsbs/2021/MC-10203091-0001.pdf
• 3/5/22 https://www.taycanforum.com/forum/attachments/tires-pdf.58326/
• 30/7/22 https://static.nhtsa.gov/odi/tsbs/2022/MC-10217273-0001.pdf
• 20/1/23 https://static.nhtsa.gov/odi/tsbs/2023/MC-10231383-0001.pdf
• ...
• 2/7/23 (cant find link)
• ...

J1.2:

• 16/9/24 https://static.nhtsa.gov/odi/tsbs/2024/MC-11008480-0001.pdf
• 8/11/24 https://dot.report/bulletins/MC-11011560-0001.pdf
• 3/12/24 TSB "38/24" (cant find link)
• 28/2/25 https://static.nhtsa.gov/odi/tsbs/2025/MC-11015166-0001.pdf

It's left me baffled whether a Goodyear Asymmetric 5 NF0 or NF1 is an approved tyre on a 21" RS Spyder rim on a J1.1 - anyone able to shed some light?

 

[d00d]

They set my RWD 20" AS tires to 36F/44R each time I'm there, contrary to the document's 33F/35R or 36F/39R full load.

 

[SoccerMan94043]

Thanks. Pressures in that document are the same as they have always been for me. No change.

looks like there has been some change for me (2025 GTS, 21" RS Spyder Wheel, Pirelli P Zero R):

According to the document trail, it was (for "summer tire", partial load ): 37 Front / 41 Back

It's now(for "summer tire", partial load ):: 41 Front / 42 Back

I just received my car from the dealer last week and they are indeed set to 41/42.

Also, the tag on my car says this:

 

[prj]

Since I have a Hunter Elite alignment bench at my shop, I will chuck my new J1.2 CT on it once it arrives, perform the measurements in all modes and post the data. Doesn't take long.

It seems like front camber adjustment can only be done by moving the subframe - does anyone know if it is possible to move it to get overall less negative camber on both sides? Or is it just side to side, so you increase the camber on one side at the cost of decreasing it on the other?

I'd probably get Porsche to do the alignment itself if camber adjustment is required, as the bumper would have to come off and then a bunch of stuff needs recalibrated...

 

[acull2000]

Since I have a Hunter Elite alignment bench at my shop, I will chuck my new J1.2 CT on it once it arrives, perform the measurements in all modes and post the data. Doesn't take long.

It seems like front camber adjustment can only be done by moving the subframe - does anyone know if it is possible to move it to get overall less negative camber on both sides? Or is it just side to side, so you increase the camber on one side at the cost of decreasing it on the other?

I'd probably get Porsche to do the alignment itself if camber adjustment is required, as the bumper would have to come off and then a bunch of stuff needs recalibrated...

According to TSB NHTSA 10187852 (15/2/2021) Porsche said "there are no adjustment options" - not sure if the unofficial way does each side independently or not.

 

[acull2000]

I thought I was on top of mine, but I just checked today (happened to be parked at full lock) and found:

Fr R: Tyre shoulder worn to cord in placed however only on shoulder - main tread worn evenly and measures a good 4mm all over (original tyre after car done 15,000miles). Not easily detectable - it's not even wear all the way around the tyre. Was in with Porsche (2 year service) 6 weeks ago and no issues found(!).

Fr L: Cords starting to show (yet still measures 5mm tread worn evenly). Done 5000miles.

I've raised the concern on the gov.uk link above; this feels dangerous (I'm a car guy and stay on top of maintenance so this caught me by surprise). Please everyone check your tyres!

UK GTS built mid-2023. Asymmetric 3 NF0.

UK DVSA have basically said they don't give a crap:

 

[cityhpper]

My understanding is that the TSBs differ between J1.1 and J1.2 for tyre pressures. Latest TSB for J1.1 is from 2023 or so...

Also, from the wording The tire pressure applies only to the tire makes and types approved by Porsche, and is specified for cold tires (approx. 68° F/20°C ). The tire pressures must never be lower than the specified values, I recon that the listed values are minimum values, and there is good reason to stay a bit above.

 

[Murph7355]

Where is this info? They haven’t bothered to tell everyone

tbh I thought it was the link posted earlier...but could also have been my dealer noting to have the pressures at the upper end.

I'm positive it's down to the amount of time the car runs in its lowest setting and/or at speed at that height. I've been conscious not to do that on this set and, with the higher pressures too, the tyres seem to be wearing better.

The only way they can wear as we're seeing is either for them to be rubbing against something or for the camber to be massively aggressive. Either way, it's not good.

(I haven't noticed it on the front tyres on my GTS ST...but the rears are very prone to it).

 

[Vercingetorix]

Toe can also destroy the edges of tires.

 

[Murph7355]

Toe can also destroy the edges of tires.

True.

But while the eye is a poor judge, there doesn't seem to be marked toe on the rear (of mine at least) but in the lower chassis settings a lot of camber is evident.

I still intend to get my car checked out at some point to see what the settings are in different ride heights. There's a big difference in height between normal and the lowest setting.

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