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They handle great and ride good. They are Michelin's ZP, version of a run flat. So far I like them.
So you are running 2 different tires? I won't do that. I have decided since they don't have the correct size front I'm going with PS4's. The 255 is 1.2" inches taller and .4" wider. I hope they decide to make a 245/35X20 some day. Thanks for the reply.
So you are running 2 different tires? I won't do that. I have decided since they don't have the correct size front I'm going with PS4's. The 255 is 1.2" inches taller and .4" wider. I hope they decide to make a 245/35X20 some day. Thanks for the reply.
I am not at all concerned in running Michelin PS4S in Front and Michelin PSAS4 in the Rear. Both are Michelin Pilot Sport Ultra High Performance tires and work well together.
The adage of "not mixing tires types" applies to using two different tire brands or tire families with-in brand with different MFG technology and performance characteristics, and pushing the tires to handling limits. As soon as you put an All Season tire on your car you knowingly, or should know, that you no longer have the maximum performance that Porsche designed into the vehicle. In other words, don't track you car on all season tires. Yet for street use and backroad twisties, where you need and use less than the maximum, they are perfectly fine, and my experience supports this.
My Michelin contacts (we have multiple Michelin engineers in our local PCA Region, as it includes the Michelin USA Headquarters), tell me that the Pilot Sport All Season 4 tire line will add the 245/35 size this summer, so when I need the front tires replaced, I expect they will be available by then. If not, I will use the 255/35R20 size and have ZP tires all around.
I also suggest that you check your tire size comparison dimensions as the 255/35R20 tire is not "1.2" taller" as you state. It is only ~0.2+" taller that the OEM size of 245/35R20.
I still wouldn't use 2 different tread designs, but that's just me. The numbers I came up with were from the Michelin website. There are different specs within a tire size. Ex AO (Audi), K1,K2, K3 (Ferrari) , NO being Porsche spec. I originally looked at the AO which list a diam. of 25.82 which I think is a misprint. After looking at your chart I went back and looked at the NO version and that is listed as 26.82 diam. Thanks for your reply.
Yes, have them on the rear of a 991.2 Targa GTS. (5 Lug Bolt Rims)
They handle great and ride good. They are Michelin's ZP, version of a run flat. So far I like them.
How are the roads in your area? The 911's suspension is not tuned to accommodate run flats (like the C8) and I find the ride tolerable with Michelin Pilot sport 4s. Fractured and potholed roads where I live in NH. I shudder at the thought of using run flats.
How are the roads in your area? The 911's suspension is not tuned to accommodate run flats (like the C8) and I find the ride tolerable with Michelin Pilot sport 4s. Fractured and potholed roads where I live in NH. I shudder at the thought of using run flats.
I was concerned at first about the ride quality, as you are. Yet I find them very similar to the OEM PS4S tires. I run with Comfort Tire Pressures of 31psi front / 36psi rear.
I am actually surprised that they ride the same as the OEM tires, since I have had bad experiences with Run Flat Pirelli tires on my Cayman. Yet these Michelin PSAS4 (ZP) tires ride surprisingly well. Our road quality is not that good as our DOT has neglected our road maintenance due to budget cutbacks over the past few years.
i read that run flats cannot be repaired,have to replace, not fix flat..
RF's can be repaired. I've had two of them plugged (properly). The puncture has to be with the tread and no closer to the edge than about an inch. Some manu's don't want you to fix them and just buy new tries...not necessary most of the time.
04-16-2021, 09:53 AM
