My tire rant
Drifting
Joined: May 2007
Posts: 1,515
Likes: 14
From: Gig Harbor WA
The recommended GM tire pressures listed in the owners manual and door edge apply to original equipment Goodyear run-flats that have a very rigid sidewall compared to other radial tires. Aftermarket brands have different specifications and recommendations than those provided by GM. Your selling tire store should be able to give you the correct inflation numbers for non-factory tires you buy. Secondly, regularly check your tires (both tire pressure and good visual inspection) at least once and month. If uneven tire wear is noticed, adjust as appropriate. (Both outside edges worn usually means under-inflation -- worn up the middle usually indicatres over-inflation.)
Last edited by Jacks02; Aug 9, 2008 at 07:00 PM.
Safety Car
Joined: Jul 2006
Posts: 4,325
Likes: 0
From: You can't get there from here NJ
St. Jude Donor '08-'09
[QUOTE=WELEPRO;1566652613]Michelin is aware of this problem, as it has been an issue with the entire Pilot Sport A/S line. Has little to do with our cars. The center portion of the tire uses a softer rubber compound than the rest of the tire. The idea was to imporve traction.
Michelin has discontinued the entire line of Pilot Sport A/S. It is being replaced with a tire called the Pilot Sport A/S PLUS, and is nearly identicle in design as the old tire, with some improvments, including the irregular wear issue.
I tested these new tires, with some others, for Michelin at there South Carolina proving grounds in June, and they're impressive.
If I recall correctly, the new PLUS tire should be available starting in September.
Thanks for the heads up on this. I know that the new ZR1s come with Michelin tires, so maybe this will be an improvement. I hate my Goodyear runflats, and I'm doing my best to wear them out.
I was planning on getting the Michelins, but I'll make sure I wait for the new " Plus" runflats. 
BTW, I run my tires at 28 lbs. cold, which brings them up to about 32-34 lbs in the summer heat.
Michelin has discontinued the entire line of Pilot Sport A/S. It is being replaced with a tire called the Pilot Sport A/S PLUS, and is nearly identicle in design as the old tire, with some improvments, including the irregular wear issue.
I tested these new tires, with some others, for Michelin at there South Carolina proving grounds in June, and they're impressive.
If I recall correctly, the new PLUS tire should be available starting in September.
Thanks for the heads up on this. I know that the new ZR1s come with Michelin tires, so maybe this will be an improvement. I hate my Goodyear runflats, and I'm doing my best to wear them out.
I was planning on getting the Michelins, but I'll make sure I wait for the new " Plus" runflats. BTW, I run my tires at 28 lbs. cold, which brings them up to about 32-34 lbs in the summer heat.
Advanced
Joined: Jul 2007
Posts: 99
Likes: 1
From: Canyon Lake Texas
When my Goodyears wore out I switched to Michelin Pilot run flats. As with everyone else who has done that, loved them. However, the rears wear out down the centers while there is 2/3 of the tread left on the edges.
I now have 22,000 on this pair, and I will be seeing cord soon. This is my third pair. After the first pair did this, I ran the second pair down at 25 lbs, didn't help. I have kept this pair at 31 lbs.
My commute takes me across the Mojave dessert and up a mountain road. I do not hot rod it as the place is CHP infested. Usually have the cruise on at 64 mph. I have not been to the track on this pair.
It is an A4 with 2.73s so it doesn't really burn the tires. Tire shop guy says Michelin has been hearing about this and feel it has something to do with centrifugal force on the wide tire pushing the center ourt. Says many cars with the wide tires, Mercedes, etc are having the same issue.
My fronts go over 50K
Anyone have an update on this issue? Anyone found runflats as good as the Michelins that don't do this?
I now have 22,000 on this pair, and I will be seeing cord soon. This is my third pair. After the first pair did this, I ran the second pair down at 25 lbs, didn't help. I have kept this pair at 31 lbs.
My commute takes me across the Mojave dessert and up a mountain road. I do not hot rod it as the place is CHP infested. Usually have the cruise on at 64 mph. I have not been to the track on this pair.
It is an A4 with 2.73s so it doesn't really burn the tires. Tire shop guy says Michelin has been hearing about this and feel it has something to do with centrifugal force on the wide tire pushing the center ourt. Says many cars with the wide tires, Mercedes, etc are having the same issue.
My fronts go over 50K
Anyone have an update on this issue? Anyone found runflats as good as the Michelins that don't do this?
Racer
Joined: Jul 2007
Posts: 440
Likes: 0
From: Orange CA
St. Jude Donor '10
The recommended GM tire pressures listed in the owners manual and door edge apply to original equipment Goodyear run-flats that have a very rigid sidewall compared to other radial tires. Aftermarket brands have different specifications and recommendations than those provided by GM. Your selling tire store should be able to give you the correct inflation numbers for non-factory tires you buy. Secondly, regularly check your tires (both tire pressure and good visual inspection) at least once and month. If uneven tire wear is noticed, adjust as appropriate. (Both outside edges worn usually means under-inflation -- worn up the middle usually indicatres over-inflation.)
Tech Contributor
Joined: Dec 2003
Posts: 19,384
Likes: 87
From: Horncastle Lincolnshire, England
2023 C5 of the Year Finalist - Unmodified
Michelin is aware of this problem, as it has been an issue with the entire Pilot Sport A/S line. Has little to do with our cars. The center portion of the tire uses a softer rubber compound than the rest of the tire. The idea was to imporve traction.
Michelin has discontinued the entire line of Pilot Sport A/S. It is being replaced with a tire called the Pilot Sport A/S PLUS, and is nearly identicle in design as the old tire, with some improvments, including the irregular wear issue.
I tested these new tires, with some others, for Michelin at there South Carolina proving grounds in June, and they're impressive.
If I recall correctly, the new PLUS tire should be available starting in September.
Hope this helps!
Erik
Discount Tire Co.
Michelin has discontinued the entire line of Pilot Sport A/S. It is being replaced with a tire called the Pilot Sport A/S PLUS, and is nearly identicle in design as the old tire, with some improvments, including the irregular wear issue.
I tested these new tires, with some others, for Michelin at there South Carolina proving grounds in June, and they're impressive.
If I recall correctly, the new PLUS tire should be available starting in September.
Hope this helps!
Erik
Discount Tire Co.
I'm not seeing the uneven wear on mine after 20k miles but I'll keep a lookout now. I run a little low at about 28 psi cold to get 30 psi hot. I have an A4 with a stock rear end as well.
Now my next problem is how to get a set of the new Michelins when they're on sale. Would you believe the AS ZPs were only sold in North America
I'm not sure Virgin Atlantic would be very happy if I checked in a set as hold baggage.
Last edited by DeeGee; Aug 10, 2008 at 02:22 AM.
