Check Your Tires!

[Murph7355]

...It is definitely NOT the alignment, but could be related to the lowest setting or 4ws, just not sure what is causing this. ...

I think it definitely is alignment. Not in the context of being "out of spec", but in the whole design of the car and, particularly, the differences between its different suspension modes.

Tyres simply don't wear this way if alignment is right.

The video posted by wafergold is interesting and it looks like that company does something that makes logical sense to me, in terms of adjusting settings in "Normal" so that the impact of "Sport Plus" doesn't take it as far out of spec. But all of these things will be relative and there'll only be so much that can be done with the fundamentals of the car's set up.

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[kempez]

Keep a very close eye on them. They will wear very quickly from this point IME.

I will do. I will change these to winter tyres in November and they will almost certainly be on new rubber by the time they are back on the car in March.

 

[Scandinavian]

Keep a very close eye on them. They will wear very quickly from this point IME.

I have a totally different experience with the Good Years Assy 3. My first set lasted nearly 40000 km, 24000 miles. They had about 4 mm left then but a self tapping screw plus a good old English pothole finished off rear and front tyres. I have nearly 20 k km , 12k miles on the second set and they are fine. I do seldom drive in Sport Plus though and have not experienced the inner shoulder tyre wear at all. My first set were evenly worn across the tyre.

 

[Murph7355]

I have a totally different experience with the Good Years Assy 3. My first set lasted nearly 40000 km, 24000 miles. They had about 4 mm left then but a self tapping screw plus a good old English pothole finished off rear and front tyres. I have nearly 20 k km , 12k miles on the second set and they are fine. I do seldom drive in Sport Plus though and have not experienced the inner shoulder tyre wear at all. My first set were evenly worn across the tyre.

I'm pretty sure those who drive in Sport/Sport Plus more regularly (either manually or by the car dropping itself at speed) are the ones suffering this the most.

On the other thread there were various models, with/without RWS etc, so those factors are unlikely to be influencing things.

The video link above does note camber changes a lot in the lower settings. Am assuming this is from measurements.

Camber is the thing that will be causing this phenomenon. Possibly combined with tyre pressures.. Though on those you'd typically see wear down the centre or edges more uniformly I think.

(Unless the inner edges are rubbing on something, but you'd expect to hear that and see other signs of damage elsewhere).

When mine deflated, only the very shoulder had worn through. The rest of the tread was within legal limits.

 

[TaycanTurbo22]

This is a really interesting thread this one and one I've kept a close eye on - my Taycan spends most of its time on the lowest chassis setting and I'm not seeing anything like the inner tyre wear that some of the examples in this thread show (FWIW mine has RWS, Goodyears) - the only conclusion can be that the alignment on some cars is wildly out of tolerance irrespective of the ride height used?

I also enjoyed the video posted, very good and informative. But people really need to know what they're looking at...yes, some measurements were 'red' (i.e. front toe), but the largest adjustment made was only c.15/60ths (1/4) of a degree (and within the specified tolerance as well!), most were c.5/60ths (1/12) - what I'm trying to say is that the Taycan in the video is a bad example of bad alignment (only its front toe was out of tolerance) - other Taycan's must be much, much worse than this given the relatively minor adjustments made? So I somewhat disagree with the clickbait video title - Porsche knows how to specify the alignment tolerances for its cars such that it is configuration appropriate...

Further, it's not unusual at all in IME for a performance car to wear the inner of the rear tyres faster than the middle/outer edges? Every car I've owned does this - typically when the outside edges are at c.3mm the inners are routinely at c.1mm (no tyre cords visible at this point). I don't think this tyre-wear characteristic is a Taycan-specific issue and I can see where people potentially get caught out if they run the outer tyre down to the wear bars at 1.6mm, further compounded by the alignment being out of tolerance...

Give the weight/performance of the car and its propensity to eat tyres, if I had even the slightest inkling mine was wearing the inner tyres faster than I'd expect i.e. slightly faster than the outside, I'd be getting an alignment by a competent outfit (like the on the in video) done sharpish. I check my tyres every few weeks when I'm washing the car, if something is getting out of hand, I'm going to be on top of it before its terminal.

Some examples in this thread are extreme though - I hope those of you with this very unusual wear characteristic get it sorted without too much bother.

 

[Fish Fingers]

Mine suffered badly with this (pics posted earlier in the thread).

Its a RWD so doesn't have Sport Plus.

I don't have rear wheel steering.

It spends most of its life on Medium ride height (not lowered).

The tyres were Michelin PS4.

Tyre pressures were correct.

So mine doesn't match a number of the theories posted.

 

[f1eng]

The high wear on the inner shoulder is far more likely to be caused by high negative camber than toe-in IME.
The camber at normal ride height is quite marked for a road car.
My Goodyears are wearing OK so far but I drive 99% of the time in normal, I find the body control and ride compromise better overall than in Sport and Sport + is pointless on the roads around here, I don't use motorways often so my car has rarely experienced the extra negative camber.

I am currently on loaded tyre pressures for holiday season but will be back normal in a couple of weeks.

 

[Murph7355]

.... ...
Further, it's not unusual at all in IME for a performance car to wear the inner of the rear tyres faster than the middle/outer edges? Every car I've owned does this - typically when the outside edges are at c.3mm the inners are routinely at c.1mm (no tyre cords visible at this point). I don't think this tyre-wear characteristic is a Taycan-specific issue and I can see where people potentially get caught out if they run the outer tyre down to the wear bars at 1.6mm, further compounded by the alignment being out of tolerance...

......

Uneven wear to this degree is extremely unusual IME. And the only time I had remotely uneven wear than this was when something needed sorting (or when deliberately running low pressures).

I'm not doubting cars are likely to be in spec... More that the spec choices might be a bit aggressive, and definitely don't seem to account for the marked changes in ride height possible/likely.

Am going to pay close attention to my current set of rears (my fronts don't seem to suffer the same issue).

 

[bn8959]

My GTS is on 21” PZero’s. After 9,000 miles they need replacing, however no sign of excessive inner wear - all looks even.
98% of driving has been in ‘Normal’.

 

[RacingDuck]

Has someone done a comparison between NF0 and non NF0 specced tires?
I would assume that the high camber is known during the development of the tires and thus could work out to using a harder compound on the inner shoulder of the tire compared to normal tires.

I'm also quite curious now if the new active ride has the same camber settings or if the active system doesn't need that much camber. ?

 

[f1eng]

Has someone done a comparison between NF0 and non NF0 specced tires?
I would assume that the high camber is known during the development of the tires and thus could work out to using a harder compound on the inner shoulder of the tire compared to normal tires.

I'm also quite curious now if the new active ride has the same camber settings or if the active system doesn't need that much camber. ?

I don't see why active ride would require different static camber, and the camber change with wheel movement is built into the geometry which is unlikely to have changed.

 

[kempez]

I have a totally different experience with the Good Years Assy 3. My first set lasted nearly 40000 km, 24000 miles. They had about 4 mm left then but a self tapping screw plus a good old English pothole finished off rear and front tyres. I have nearly 20 k km , 12k miles on the second set and they are fine. I do seldom drive in Sport Plus though and have not experienced the inner shoulder tyre wear at all. My first set were evenly worn across the tyre.

Do you know what the pressure specs on these tyres are? I've asked Porsche several times but they are not very helpful. They told me to use the PCM pressure measurements and top up as appropriate

 

[whitex]

Do you know what the pressure specs on these tyres are? I've asked Porsche several times but they are not very helpful. They told me to use the PCM pressure measurements and top up as appropriate

If you tell your PCM what tires (size, summer/winter/all-season) you have, along with full or half loading, it will tell you what tire pressures are expected.

 

[kempez]

If you tell your PCM what tires (size, summer/winter/all-season) you have, along with full or half loading, it will tell you what tire pressures are expected.

Porsche change them, and I've checked and it's all correct, so that's what I'm using. It would just be useful to see the specs written down somewhere

It’s not always that helpful - see picture

 

[whitex]

Porsche change them, and I've checked and it's all correct, so that's what I'm using. It would just be useful to see the specs written down somewhere

It’s not always that helpful - see picture

The PCM will actually show you the expected cold tire (I think that's at 10C, from my experience) absolute pressures. I usually start there, then adjust +/- 1 after a day or two and driving a few miles. This is what the PCM screen looks like with target cold pressures:

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