Tyre (Tire) Wear

Pirelli quote new tyres come with 7.5mm of tread depth when new.

As per Scrounger - you are wrong about the original tread.

Our '22 BGTS with ~5,500 miles has PZeros and after five track days and one AX day they are ready for the scrap pile. The replacements (PS4S) are in the garage and will go on after the next AX. Recently purchased a dedicated set of track/AX wheels and tires, so I expect to get somewhere in the neighborhood of 20,000 errand fetching miles on the PS4S before they require replacement in the future.

On the flips side, our PS4S shod '17 BS with 5,811 miles (when she was claimed by her new owner ) also had five track days and 4 AX's, yet still had a minimum of 5,000 miles remaining. The Michies wore so much better and were far quieter than the PZeros.

Thus, your silver lining is the sooner the PZeros devolve, the sooner you can swap in new Michelin PS4S tires...they're the bomb!

Tyres normally come with around 8mm as new, but a bit of googling should tell you what they were for your tyres. Done about 5k on my rears (Pirelli Zero - OEM), gone down about 1mm. I expect to change at 3mm so approx 25k miles per set of rears.

Treemagnet said:

Thus, your silver lining is the sooner the PZeros devolve, the sooner you can swap in new Michelin PS4S tires...they're the bomb!

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^This!^

I wonder if a lot of the excessive rear tire wear is due the scuffing we get when we engage In wheel lock turns getting out of the driveway or parking lots.

Dbardon said:

I wonder if a lot of the excessive rear tire wear is due the scuffing we get when we engage In wheel lock turns getting out of the driveway or parking lots.

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I'm no engineer, but IMHO is that causes very minor wear and certainly not near as much as one hard breaking scenario (YMMV).

I bought the car with 6k miles and the first thing i did was have it aligned focusing on tire wear. the rears were done at about 10k, the fronts are almost done at 19k. I switched to michelin AS3+ because of the treadwear rating.

Mark_G said:

As per Scrounger - you are wrong about the original tread.

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I'm not sure if that is good or not!
I've therefore used 1.6mm in 2500 miles = 1560 miles per mm.
Changing tyres at 2.5 mm average that means there is 5mm of usable tread, so 7800 miles life: about a year of normal use!
I guess we have to pay for our pleasure......

That’s the price we pay for sticky tyres.

I know, but my Morgan Aero Plus 8 with 367 bhp and RWD doesn't wear its tyres as quickly.
But it isn't a turbo and the torque arrives more slowly....

And it’s 300kg lighter

Dbardon said:

I wonder if a lot of the excessive rear tire wear is due the scuffing we get when we engage In wheel lock turns getting out of the driveway or parking lots.

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do you mean front wheel scrubbing because of Ackermann effect?

BTW most of the tire wear is due to the suspension TOE setup. More Toe-in means faster wear.

My Pzeros lasted a good 14k before I changed them, they actually couldn’t have done another 1k. But as the winter was here, and I was going on a reasonably long trip I just changed them out for a set of PS4s

Chris, what do you take as the wear limit?
Rules say the wear bars are at 1.6mm, but I feel that for a performance car that is not enough grip, I use 2.5mm as the "limit"

I'm South UK, and I consider my limit to be 3mm. Go beyond that, and the aquaplane resistance seems to fall off a cliff.

I'm also in the South, in Wiltshire and agree, 2.5mm to 3mm has to be the limit.
I'm not overly impressed with the P Zeros. The AMG C43 has PS5s for summer use and the Morgan PS4S and both are predictable.
We have Pilot Sport Alpines on the C43 for winter use and they are amazing, they just grip, even on packed slush.... I guess it helps that the C43 is AWD.
Our house is on an unadopted road (track really) and it slopes up to the surfaced road. Even with packed snow a few years ago the C43 just went up the hill and pulled away after stopping.

If the wheels were not so expensive I'd get a set of winter tyres for the Boxster. Instead I use the C43.

Same as Marco. 3mm would be the minimum i'd go to before changing.

224 PJ said:

Chris, what do you take as the wear limit?
Rules say the wear bars are at 1.6mm, but I feel that for a performance car that is not enough grip, I use 2.5mm as the "limit"

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There was 2.5mm on the rears, and 3mm on the fronts when I changed mine.