Tyres – never had this issue before on any car …

[ct4s]

I keep a close eye on my tyres. Tyre pressure values are always displayed and tyres pumped up when needed, and I check the depth every month or so on the outer, middle and the inner grooves.
However, it’s hard to check the very inner edge, so I was shocked to see a 6cm split which looked ready to go to 8+cm.
I don’t recall hitting anything, so no doubt a symptom of a very heavy car and shitty roads plus too much camber.

I only noticed this because I fitted my winter wheels.
The fronts are wearing evenly across the whole width and have 5+mm left. The rears were even and down to 3mm except the very inner edge. (I’ll get the camber checked).
Tyre date codes are Oct 2024, and they were fitted in Feb 2025 and have done under 8,000 miles!
305x30R1, Goodyear Eagle F1, Asymmetric 5, NF1.

As an aside, the 20” winter wheels transform the ride and comfort of the car. Far more compliant on our crappy roads.
But I can’t push as hard from standstill or through a corner. And the 21” Spyders look so much better.

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[Tooney]

See this thread by @Vim Schrotnock and other forum threads.

 

[ct4s]

Thanks for the link.
I'll take a read tonight.

 

[Fish Fingers]

Very common......as mentioned there are numerous posts on here in the past (including mine).

Afaik the exact cause or conditions were never traced, as it happened across various models, in different conditions, with various wheels & tyres.

 

[ct4s]

Update - I'd misread the manufacturing date code - I thought it was an Oct date but it was week 10 of 2024!
So, these tyres were fitted form new and have done circa 16,000 which is not too bad re mileage.

However, the split still concerns me.

 

[Vercingetorix]

I’m wondering if this tire hasn’t been run low. The top half of Goodyear looks scrubbed off.

 

[ct4s]

Good spot with the wear.
They’d done 10k miles before I bought the car.
I’ll keep an eye on the pressure even more so once they’ve been replaced.
On winters now for a few months.
Suspect I’ll have to do the camber once the Spyders are back on it. Or could it be done with the winters on?

 

[Nickj]

I’ve had my car nearly 5 years now and have lost count of how many tyres I’ve been through and all the inside edge, sometimes through to the metal threads and either I notice or on 2 occasions the tyre blows out. Tread always look strong when you check visually, sometimes 5mm plus. Luckily I don’t pay for the tyre so haven’t really worried too much. Tracking ws done at Porsche and no change. I do run the car on lowest setting though.

Just had 2 new fronts today at Porsche, tread all good on main body of tyre. I noticed one but not the other. This is one tyre, main tread 5mm.

 

[Nickj]

But I would say your tyre looks wheel worn and 16k is good miles for this car, so don’t worry.

 

[Murph7355]

Very common......as mentioned there are numerous posts on here in the past (including mine).

Afaik the exact cause or conditions were never traced, as it happened across various models, in different conditions, with various wheels & tyres.

100% very common.

It's a poor design compromise by Porsche for it to happen so frequently.

There's a firm on the UK South Coast that has different geo settings that are alleged to help (see links).

I think recommended tyre pressures are now a chunk higher too.

 

[rim23]

How often sport plus is used?

 

[mutanthands]

How often sport plus is used?

It's not just Sports Plus, but any mode that lowers the car, such as Range Mode.

 

[Fogsvans]

This is one of my rear tires late this summer. Camber checked by the workshop and found to be OK.

 

[cityhpper]

Not a pretty sight... This is the Pilot Sport 4 in 285/40R20, yes?

Treadwear seems quite even across the tyre, but with serious de-lamination? What did the measurements say regarding toe-in, was that also inside tolerances?

 

[Fogsvans]

Not a pretty sight... This is the Pilot Sport 4 in 285/40R20, yes?

Treadwear seems quite even across the tyre, but with serious de-lamination? What did the measurements say regarding toe-in, was that also inside tolerances?

Correct on tyre and dimension. The other rear tyre also worn on the inside but without de-lamination. Wear is much more extensive on the inside. Workshop checked all wheels with laser equipment and both rear wheels within tolerance. Only a small adjustment on front wheels.

Not too bad anyway considering 34000km on the set.

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