+1, you're living with compromised performance in both seasons.

Unlike so many others around here, I'm reasonably satisfied with PZeros. Mine are showing zero signs of wear at 6K, and I think the warm weather handling is superb.

You do have to seriously dial back your driving style in cold weather, which any sane person should be doing, and they do OK. However, I absolutely stay away from frozen precipitation with them and don't drive the car when that is likely.

 

I'm guessing you are not driving it today.

 

Yes, today is a Jeep day.

 

Found out this evening that since the 19 inch wheels have a 9.5 inch width, the safe size to increase to would be 285/35/19s, up from the stock 275s. Going to up to 295 will push the sidewalls in too much and force you to underinflate the tires, or risk getting a poor tire contact patch. I would rather keep the tires inflated properly and have some peace of mind.

 

I must say I was surprised how little throttle in a straight line from rolling it took to lose traction in the wet with the P Zeros today.

 

Yes, it doesn't take much. They are definitely dry and warm pavement tires, but, what until you try it on dry pavement at 10º C and below. It gets progressively worse, the colder it gets.

You can still drive it, but you do have to be careful with the throttle and not carve those corners the same way you likely do on warm pavement. On the other hand, you should be fine in Oz with your moderate temps year round.

 

That's right. still holds true. While there aren't many cold mornings here I have noticed significantly less slip on the pss. When the car was cold with the pirellis, I would spin just getting out of the subdivision.

I have noticed that the tpms goes off anytime it's below 40. But resets once the tires warm up.

Only spin I have had with the pss was during a hard acceleration (3/4 throttle) off a stop light.

Yeah... my inner teenager came out when a dude in a m3 thought he could race me. There was no contest.

 

When I was reading about the rain snow and ice mode on the car I thought I would never use that here, but I have to say that over the past couple of days of pretty constant rain here I have been using it and find it very helpful.

 

That is odd. I've taken my car out on mornings below 20ºF, and the TPMS has never been on. I check my tire pressures every 2 weeks, and keep them at 36psi per the JLR spec.

 

Would be more useful to see the measurements rather than whether there are "signs of wear".

 

I'm not sure if it would be a good idea to fit 2 different tires on your car.

 

No, it's not a good idea. Two entirely different tread patterns (front vs. back) and compound differences could well lead to control issues.

 

I think you are right. I think I will just treat myself to new rubber all around.

 

+1

 

I guess I can't be more useful in this case. Perhaps you can take some measurements going forward.

 

it is never a good idea to run two different manufactor's tires on a car. in fact, it can be dangerous. they have different thread patterns. i strongly encourage you not to do this!!!!

 

I'm curious, has there ever been any independent study or testing done to verify that this is actually a problem? What actually happens? What is compromised? What are the thresholds before issues occur (speed, driving style, front vs rear etc).

 

I was wondering that too. I can see it being potentially an issue side to side, but I'm not sure why it should be an issue running different front to rear, in a non AWD car there is no physical connection between front wheels and drive train so can't see how it could cause a problem.

The only thing to watch out for I would have thought is that your limit of traction will be determined by the weakest link but it will be the same general result as if you had the weakest tyre on all four wheels.

No expert here, but just trying to think it through.

 

I can't imagine any scientific basis for your assertion if we are considering front vs rear. I would agree it would not be a good idea to run different tires on each side, as that biases contact surface area and water channelling to one side or the other, consequently biasing grip and handling.

Different tread patterns front to rear are irrelevant - you already effectively have that on any car that runs different size tires front and back like the F Type, so the surface area of contact tread is immediately going to be different (smaller) at the front.

Of course, I could be wrong. Working for Australia's leading tyre franchise for 17 years may have taught me nothing.

 

It really is only an issue for inexperienced drivers. Definitely dicey to have different tires side to side since the handling characteristics will vary between left and right turns. Different tires front and rear, not so, but can present a problem if you get too close to the traction limits of either set. One tire may start to loose traction slowly while the other might lose traction abruptly.


That said, I'm too cheap to replace four tires if only two are worn out. You just learn to adapt your driving style to accommodate the differences in tire construction and compound. Pushing the car to 99.99% at the track, I would opt for the same tire all around.