Can someone explain this to me...

[Sybil TF]

Part of the tire is hidden in the shadow.

[Josrocket]

My tires looked the same debris wise. I was concerned but let it go. They still wore evenly when it was time to replace them

[Matt Dillon]

SO, what is the conclusion on all of this Speculation?

[SA Heat]

Michelin Pilot Sports are dual compound tires. That looks like the compound on the outside shoulder reacting to the road a little differently than the rest of the tire. The PS2s on my Gen 2 did the same thing depending on the temperature/road conditions.

"On the outside, Pilot Sport PS2 features two different tread rubber compounds (a hybrid silica/carbon black compound that begins at the tire's outer shoulder and continues across the tread until it joins a high-silica compound that continues to the tire's inside shoulder) molded into an asymmetric design with large outer shoulder blocks and continuous intermediate and center ribs to enhance steering response and cornering stability. Both tread compounds are specifically formulated for their location to combine dry and wet traction with crisp corning and high speed capability. The tread design also features wide circumferential grooves and lateral notches that help channel water through the footprint to enhance wet road traction."

[Lemay88]

Hi guys,

I wrote an email to Michelin to seek for an official answer. Here's what they had to say about it:


We would like to thank you for your email

We would not have any information to share with you to why dirt is not distributed across the tread of your Michelin Pilot Sport tires. Since our tires are design for road use, we would not have any information to share.
We appreciate your business.

It is our goal to ensure that your issue has been resolved or your question answered to your satisfaction. If we can assist you further, please respond to this email or call us at 1-888-871-4444 (toll free) between 8:00AM and 8:00PM Eastern Time Monday through Friday or between 8:30AM and 4:30PM Eastern Time on Saturday.

Sincerely,

Alvin
Consumer Care Department
Certified Michelin Product Expert

So, no official reason from Michelin but I would believe SA Heat would have the right answer. 2 different compound would explain it best

Ben