I shall be getting my new Michelin PS AS 4's installed Friday.
I plan to keep my existing P-Zeros (only 8K miles) for another Summer and shall switch back in May.
After that, I shall most likely stay with the PS AS 4's year round.

So, my questions relates to tire rotation.
I was under the false imprssion that the P-Zeros (and the PS4's) were both assymetric and directional, and could not be rotated to improve wear.
It turns out that in fact they are assymetric but not directional.
Given that they are not directional, I am thinking that I should switch side to side when I re-install the tires next year.
Then with the new Michelins it would lso make sense to rotate (side-side) every 6K miles or so.

Do others rotate their tires in this way?

 

How does swapping tyres on the same axle improve wear? I can understand swapping from driven to non-driven wheels but that's not possible with staggered sizes.

 

If you are tracking the car, it can help even out wear as most tracks are run counterclockwise so there will be more wear on one side than the other. However, for street driving, unless you are always and only making right or left turns, then there is little to gain.

 

We have a lot of rotaries/roundabouts around here…

 

Thanks, Guys, I got it figured out!!
You are all right.
While the tire will rotate differently if moved side to side, the inner side will still be on the inside and vice verse for the outside.
So, with good alignment there is no point in swapping.
Likewise, there is no need to mark the tires L/R when they come off.

 

In another life with tracking a Z3MCoupe , we would remove both eg: front tires, then mount the former R front on the L front….with each tire going the same direction.
thus the worn “inner” side of each was now the “outer”.
seemed a good idea at the time.
ymmv

 

Unfortunately does not work with either the P-Zeros or the Michelin PSAS4's.
They are both assymetric and the "outer" must remain the "outer".
So while I could rotate side to side, the tires would rotate in opposite direction, but would still wear the same way.

 

just went thru this with a tire expert. He said side to side if not directional, is still a good idea for better tire wear.

 

So may be I'll do it anyway.
No downside that I can see.

 

Did he explain how that works? I can understand it if you predominantly drive left more than right (or vice versa), but not if you drive "normally".

 

You are theoretically correct if you assume that both front axles and both rear axles are in perfect alignment.
In all probability there will be small differences that may barely show as differences in tire wear.

 

If you notice, standard street alignment doesn't result in perfect linear wear. So swapping left-to-right can make a difference. Having said that, these tires tend to wear so fast if you do push the car at all, it likely won't make enough of a difference to make it worth it. Alternately, if you are not using the car, the tires will age out after 3 years, so you'll be replacing them anyway. (Yes, I know, some people insist that you can go 6 years, but it depends on climate, where its stored, and your willingness to put your neck on the line by pushing a car on 3+ year old tires.)

 

No, he didn't and I didn't keep quizzing him. My Jag is a '21 F type R, but I was in my M/B C43 coupe when I was getting it serviced...like the Jag, the M/B has larger tires on the rear than the front. While I was at the dealership, The Michelin rep was there and I asked him about rotating the fronts and the fact that those tires would then be turning backwards. He said that the only issue with today's radials (most are steel belted) is if they are "directional"...as long as they aren't, switching right to left is OK and a good practice with regard to tire wear/mileage received. He seemed to know his stuff, so I rotated them. Sorry I can't give you a better explanation.

 

The only downside is possible damage to removing and installing tires and wheels. I view extra oil changes (“it can’t hurt”) the same way - it can’t hurt as long as it’s done properly. If it’s overfilled, wrong oil is used, or something gets stripped or broken in the process, then it does hurt.