[///MPhatic]

Originally Posted by chris719

I'm pretty sure it will beat the 660 and 71RS as a street tire. The AD08/AD08R (not RS) was a very good tire still and very very old.

Depends on what you call a street tire. They are all 200TW, and I've had the AD08R (the good one), and it wasn't nearly as good as the old 71R. I have never had the 615K, or the 660, but I have friends that swear by the new 660.

I don't think the AD09 is going to do anything but be quiet, heavy, wide, and last longer because it has more tread to start with, which means it'll squirm around more.

[chris719]

Originally Posted by ///MPhatic

Depends on what you call a street tire. They are all 200TW, and I've had the AD08R (the good one), and it wasn't nearly as good as the old 71R. I have never had the 615K, or the 660, but I have friends that swear by the new 660.

I don't think the AD09 is going to do anything but be quiet, heavy, wide, and last longer because it has more tread to start with, which means it'll squirm around more.

A052 is basically category leading, so I don't underestimate Yokohama when it comes to this category of tire. This tire doesn't have to meet any Euro specs like the AD08RS did.

[H2O_Doc]

I started a thread elsewhere on best tire for cold weather and there were some data posted that suggested all seasons weren't necessarily much better if at all. What I'm reading here, if in reading it correctly, is that maybe the PS4S remains grippy at lower temperatures than some other summer only tires. Is that correct? Is it a tire that is OK into the 30s (Fahrenheit) or lower?

Edited to add this piece of data:

[///MPhatic]

Originally Posted by chris719

A052 is basically category leading, so I don't underestimate Yokohama when it comes to this category of tire. This tire doesn't have to meet any Euro specs like the AD08RS did.

Meh, the tire has no lasting power, it's a cheater tire, end of story.

Originally Posted by H2O_Doc

I started a thread elsewhere on best tire for cold weather and there were some data posted that suggested all seasons weren't necessarily much better if at all. What I'm reading here, if in reading it correctly, is that maybe the PS4S remains grippy at lower temperatures than some other summer only tires. Is that correct? Is it a tire that is OK into the 30s (Fahrenheit) or lower?

No Summer tire is supposed to be used under 42° F, as it literally changes the structure of the tire, and it'll never be the same. Can you do it? Sure. I've seen a LOT of Mustangs/Corvette's that come with Cup2's driving around on freezing days, but they have damaged the tire in a way that can't be fixed, so the grip will never be the same. I don't think the tire becomes dangerous, you just turn a $1800 set of tires into a $900 set of tires with regards to grip.

[chris719]

Originally Posted by H2O_Doc

I started a thread elsewhere on best tire for cold weather and there were some data posted that suggested all seasons weren't necessarily much better if at all. What I'm reading here, if in reading it correctly, is that maybe the PS4S remains grippy at lower temperatures than some other summer only tires. Is that correct? Is it a tire that is OK into the 30s (Fahrenheit) or lower?

Edited to add this piece of data:

No, they are really bad even in the dry below whatever their glass transition temperature is. It may be 30F, it may be 20F, whatever it is, once you pass it, the grip is gone, even on dry.

[bitcore]

Originally Posted by ///MPhatic

No Summer tire is supposed to be used under 42° F, as it literally changes the structure of the tire, and it'll never be the same. Can you do it? Sure. I've seen a LOT of Mustangs/Corvette's that come with Cup2's driving around on freezing days, but they have damaged the tire in a way that can't be fixed, so the grip will never be the same. I don't think the tire becomes dangerous, you just turn a $1800 set of tires into a $900 set of tires with regards to grip.

This is interesting.
How does cold temperature damage the tire? Does the compound simply break down when it encounters freezing temperatures? Does damage only occur when work is done to the tire under freezing conditions - meaning, will summer tires in freezing temperatures on the car, but not being driven, also damage the tires?

[///MPhatic]

Originally Posted by bitcore

This is interesting.
How does cold temperature damage the tire? Does the compound simply break down when it encounters freezing temperatures? Does damage only occur when work is done to the tire under freezing conditions - meaning, will summer tires in freezing temperatures on the car, but not being driven, also damage the tires?

The way it was explained to me was that Summer tire compounds do not stay pliant in temps under 42° so they have no choice but to develop micro cracks. The colder the temp, the larger the crack. So let's say you're driving around at 40° ambient, you're causing cracks until the tire gets above 42°. Now imagine you're not driving but your car is just parked in sub 40° temps, you're fine until the tire starts to lose air, at which point the tire will move, and cracks will form.

There is no way to store a Summer tire and have it retain 100% of the grip it currently has unless you store it over 42°, and under no circumstances should it be subjected to sub 32° temps.

[chris719]

Originally Posted by bitcore

This is interesting.
How does cold temperature damage the tire? Does the compound simply break down when it encounters freezing temperatures? Does damage only occur when work is done to the tire under freezing conditions - meaning, will summer tires in freezing temperatures on the car, but not being driven, also damage the tires?

Below the glass transition temperature, the rubber becomes hard and brittle. If cold enough, even storage is damaging. A few years ago there were a bunch of Corvettes parked outside at Bowling Green that were exposed to a few particularly cold days and the tires all had visible cracking.

[Steelguin]

I am getting new tires this weekend. I'm going with PS4S 255/275 combo. They don't have stock size without waiting. I assume these fit and will be fine from what I've read. Is an alignment needed ?

[tropicatango]

Originally Posted by Steelguin

I am getting new tires this weekend. I'm going with PS4S 255/275 combo. They don't have stock size without waiting. I assume these fit and will be fine from what I've read. Is an alignment needed ?

No alignment needed for new tires assuming your current alignment is perfect

[Steelguin]

I went with the 255/275 PS4S combo. Its so nice to have traction again.