Hi all,

The rear tires of my 2017 991.2 4S (with PDCC if that matters) only got 5 months/ 7k miles before hitting wear bars or 2/32. Michelin warranty pro-rated replacements, meaning I basically got 30% discount. Haven't measured the front, but they look near new.

Mostly highway miles and recently paved roads (asphalt), but I don't drive like grandma. No track time, but plenty of spirited driving.

How many miles are others getting on these tires? Based on past 'slower' cars, I was expecting 15k+ or a new rears per year and set of fronts every two years.

 

Sheesh you really have no luck with these tires.

I'm not a California resident but the few times I've been, you seemed to have some of the worst roads in the country.

I am running Cup 2s and after 30+ launches and aggressive driving I am still at 5/32nd tread at the lowest point in the rear. Roughly 5000 miles.

 

can u please post a pic? The rears tend to wear more on the inside unless you drive on lots of twisty roads. Just curious to see how uniform the wear is.

 

I don't have a pic and they're already replaced.

Wear was fairly uniform. Very slightly more on inside, but a stretch to call it a problem. Inside and outside 'blocks' didn't seem too worn. Mostly center tread was done. Tire shop thought wear looked good.

Car has PDCC and that supposed to reduce the inside war somewhat. Also has RAS so not sure if that's a factor on wear.

 

Center wear is mainly due to over inflation. I see 991's constantly running 45-55 psi in the rear. Keep them at 35 psi cold at the maximum.

 

Proper inflation - eg close to the "comfort settings" in the owners manual, go a long way towards uniform wear on properly aligned suspensions.

 

Really? I just went off door label 36 front, 44 rear cold.

 

This is ideal for high speed driving (autobahn). If you live in the US definitely lower those pressures.

 

Too low will also cause premature wear albeit they will grip better and feel softer. I am running 35/40 now in my fairly new ones and they are fine for the good roads that I frequent. There are lots of threads on tire pressure and if you read a few you will see that there are many of us that run different pressures albeit not too many running too high.

 

Thanks. I just read about it, and discovered the TPMS menu in the car. I just lowered my tire pressures, looking forward top going out for a spin. I knew they felt too hard/stiff. I had a long highway drive last night and felt every expansion joint.

 

My tires were 45 PSI for some time, but were reduced to 35 max pretty quickly as I realized handling was off. I don't think wear looked over-inflated... wear was pretty uniform.

Anyone actually have a report of how many miles they for on a set of rears with MP4S?

 

I don't believe your wear is terribly irregular. My 2014 C4S provides no indication that I'm really pushing the car until physically inspecting the tires which begin to get furry on the outer tread blocks and round-off the more central bands in the tread (with no apparent drama). I live near the mountains so it may just be me and my environment. Our cars don't eat tires like the Nissan GTR's seem to, but pushed can develop quite an appetite for rubber buns...Heck, Where do you think they get that wide butt!

 

Do you have rear-wheel steering?
I only got my 2019 C4S two months ago, so I can't tell yet, but mine has rear-wheel steering, so I've been told to
expect greater rear wheel wear.

 

Yes have rear steering. Is there anything documented that increases wear? I would think it reduces wear due to steering geometry.

 

I have a C2S that only got 6k miles out of the rears. I had an alignment done and i will get 8-10k out of this set.