M3P OEM Michelin Pilot Sport 4 vs 4S

[dfwatt]

Interesting. The opposite of dfwatt’s assumption but he was right in saying there are two compound hardnesses in the tire.

Nice! So I'm assuming that you measured the tread compound hardness on both the inner and outer edges? According to Michelin, those are different compounds too?

 

[Sam1]

Interesting. The opposite of dfwatt’s assumption but he was right in saying there are two compound hardnesses in the tire.

The sidewalls being soft don’t make logical sense because that would make the car handle worse when cornering.

 

[dfwatt]

Just verified my assumption that the corner tread/sidewall compound is harder than the middle tread. Corner compound is 70HA, middle compound is 65HA.

View attachment 614318 View attachment 614319

Now that I look at the picture a little bit more careful it looks like you did measure the inside and the outside treads. What about the center tread?

 

[Sam1]

Now that I look at the picture a little bit more careful it looks like you did measure the inside and the outside treads. What about the center tread?

Center tread is 65HA, the outside tread on the outside edge of the bonding line is 70HA. Didn't think to measure the inside corner, but since they are directional that may matter/be different - will check that later this morning.

 

[dfwatt]

Center tread is 65HA, the outside tread on the outside edge of the bonding line is 70HA. Didn't think to measure the inside corner, but since they are directional that may matter/be different - will check that later this morning.

Did you measure at operating temperatures?? If not, what was the ambient temperature?

 

[Sam1]

Did you measure at operating temperatures?? If not, what was the ambient temperature?

only measure tires cold, never after use

 

[Sam1]

Now that I look at the picture a little bit more careful it looks like you did measure the inside and the outside treads. What about the center tread?

just checked, inside corner measures at 70HA too.

 

[Clivew]

The sidewalls being soft don’t make logical sense because that would make the car handle worse when cornering.

The construction of the tyre in regards to the sidewall stiffness is not related to the rubber compound. Using harder rubber on the shoulder reduces the accelerated wear that normally occurs in this area on a performance tyre running ‘road spec’ camber.