Quote:
Originally Posted by TheMechanic
One final question about tires, I see the load rating on stock tires being a 93, and plenty of tires out there with an 89. AFAIK, there is plenty of load reserve left for an 89 tire - 1279LBS - to be used on M3 E92. Would this affect at all handling at extreme temps, on track? Lower load ratings means softer sidewalls, right ? A difference of 154lbs per tire as load index.
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The PS4S isn’t a particularly sticky tire, which might make the car feel unpredictable as you stated.
Load rating refers to how much weight a tire can carry. A higher rating means the tire is stronger and better at handling heat, which is crucial for track use. Hard braking and cornering put a lot of stress on the tires due to weight transfer, so having a tire that can handle that heat is important.
In general, higher load and speed ratings mean a more durable tire. But with track tires, it’s like UTQG ratings—the numbers don’t mean anything at all from my understanding.
an 89 load index (1279 lbs per tire) vs. a 93 load index (1433 lbs) means the sidewalls will be softer. The 154 lb difference per tire might not seem like much, but lower load ratings often allow more flex, making the car feel less stable at the limit.
If you're running aggressive camber and higher tire pressures, that can help compensate for the softer sidewalls.