I've read conflicting reports on this. Do street tires gradually heat cycle and lose grip as they age? I'm using Michelin PSS for daily driving and track days, and they have about 20K miles and 10 or so track days. So they're well worn for sure but they still (barely) pass state inspection and have a little remaining tread.
Much to my frustration, I am consistently a couple seconds slower on these tires than I was when they were new. Everything else on the car is identical. They certainly feel like they have less grip, but I hate making excuses.
Much to my frustration, I am consistently a couple seconds slower on these tires than I was when they were new. Everything else on the car is identical. They certainly feel like they have less grip, but I hate making excuses.