Poor Rear tyre wear

[Bigcol]

I have a Mecan S, 1 year old and coming up to 17,000miles. The rear tyres are worn on the outer edge, down to 2mm and the inside is 4 to 5mm. I suspect something is wrong. I have questioned the supplier (Hull) twice about this and they say its normal. I don’t think so. I will consult another dealer next week.
Can anyone say if they have noticed a similar phenomenon.

Thanks, Colin

 

[Greenman986S]

What pressures are you running?

 

[Bigcol]

2.4 the same as it was supplied new with. I questioned if it was correct when I last showed concern and they said it was correct.

 

[TomNauntonMorgan]

I have a Mecan S, 1 year old and coming up to 17,000miles. The rear tyres are worn on the outer edge, down to 2mm and the inside is 4 to 5mm. I suspect something is wrong. I have questioned the supplier (Hull) twice about this and they say its normal. I don’t think so. I will consult another dealer next week.
Can anyone say if they have noticed a similar phenomenon.

Thanks, Colin

Check the 4 wheel tracking

 

[Bigcol]

it has been checked twice at Hull and they say all is ok.
That is why I am asking on the forum, if others have the same experience.

 

[Lancerlot]

17k in 1 year - you're certainly getting some use out of your Macan S!???? Macans generally are well known for wearing their tyres evenly, so I can't agree it's normal with nothing wrong.

If tyre wear is the same on both sides, the pressures are too low or the geo is out.

If the tyre one side is more worn on the inside and outside on the the opposite side, then the car is crabbing and you'll need to check the subframes & suspension components for wear and/or damage.

Maybe get a second opinion on chassis set-up? []

Regards,

Clive

 

[Bigcol]

Thanks Clive, you have answered my concerns regarding if this is normal, and no I don’t think it is. I intend asking another OPC and an independent as well.
The wear is even. The pressures are to book, so something isn’t right, in my humble opinion.

My previous car was a an Audi SQ5. Supposedly the same chassis and engine. 40,000 miles and sold it with more than 3mm tread on all the tyres. It’s only my opinion but that was a much better car than this one. Back to Audi for me and the sooner the better.

 

[JurassicGTS]

My Macan got 27,000 miles on the rears and they were wearing evenly across the tread but down to 3mm when I had a puncture so changed both. Fronts are now on 30,000 and still have 3mm across the tread although looks like they are starting to show signs of potential cracking, so will be changed soon.

 

[Greenman986S]

Are the (rear) brakes showing a similarly high rate of wear?

 

[Bigcol]

I haven’t looked. Why do you ask ?

 

[Greenman986S]

I believe (but happy to be corrected) the brakes are used as part of stability control.

the high wear rate (v other owners) could indicate an issue , perhaps is a heavy right foot.

 

[Bigcol]

The brakes don’t look bad at all. I would say its not a stability control issue, only because most of the miles are on boring motorways. Anyway the thing is, it is up to Porsche to answer to it.
wish me luck.

 

[JurassicGTS]

The brakes don’t look bad at all. I would say its not a stability control issue, only because most of the miles are on boring motorways. Anyway the thing is, it is up to Porsche to answer to it.
wish me luck.

Yes you certainly need good luck in getting Porsche to get to the bottom of any issue now days.

 

[Lancerlot]

I believe (but happy to be corrected) the brakes are used as part of stability control.
the high wear rate (v other owners) could indicate an issue , perhaps is a heavy right foot.

Great suggestion. Rear brakes are applied individually on each side in order to aid turn-in/cornering. However, torque vectoring is unlikely to adversely affect the tyre contact patch. Additionally, hard acceleration tends to impact on tyre centre wear, rather than edges. Certainly this is a factor in fast 911's, but relatively unknown in Macans!

I suspect wheel toe/camber mal-alignment might be a contributing factor, since this tends to drag tyres along the road surface. []

Regards,

Clive

 

[Bigcol]

Took it to another centre today for a quick look. They put it on a ramp and measured the tread accurately. There is 2mm difference from inner to outer. Although they agreed that the wear is uneven they say they have seen this sort of degradation before. They said that due to the tyres being N rated they will probably wear quicker than the ones did on the Audi I had due to them being a more performance orientated. They also said that the AWD system puts most of the power down to the rear and only more to the front when required in adverse conditions.
Hey have booked me in for a geometry check to see if anything is amiss.
watch this space.

 

[crossbro]

After reading your post I thought I better check my wifes Macan S as it has done similar mileage. Rear tyres are :-Outer edges are 4mm with 6mm in middle, which I thought acceptable.. Could "spirited" driving be the explanation ?

 

[Lancerlot]

Tyre pressures a tad too high maybe?
Regards,

Clive

 

[Nigel Town]

…. fascinating. Late onto this thread. We’ve just changed the tyres on the front of our Macan S at 22,000. But the check at Pirelli Performance Centre at Burton identified that the rear geometry was off but they could not adjust. We ended up paying Porsche Nottingham to make the changes, but both sides were off by the same amount, this really niggled me because neither wheel has been kerbed or bashed, and both off by the same amount…... it felt to me like a factory setup fault that only came to light when the tyres first needed replacement….just outside the 3yr warranty. So, should I have checked the geometry sooner?

 

[Bigcol]

On the way to the appointment to check the tracking and within a half mile of the dealershi, they called me to cancel as the machine was broken. Now waiting to be rebooked.
Just hope the tyres last ax long as it takes.

 

[Lancerlot]

…... it felt to me like a factory setup fault that only came to light when the tyres first needed replacement….just outside the 3yr warranty. So, should I have checked the geometry sooner?

Yes, I think so. Unfortunately the dealers' PDI does not currently include a chassis alignment check, even though all the loading, off-loading and transportation prior to delivery may have upset the geo. Suspension also settles during use as rubber bushes etc compress, reducing ride height and upsetting alignment. Running the gauntlet of Britain's potholed road surfaces doesn't help either. [&:]

911's in particular are sensitive to setup with several owners finding chassis misalignment straight out from the showroom. Porsche even issued a campaign for Turbo S recently when it was found they had been delivered with non-optimal chassis settings.

Regards,

Clive