I DD and tracked PSS's for 2 two years. 275/35-19 and 325/30/19. 10,000 miles and 18 trackdays. The PSS's are good until they got hot. Depending on outside temps. I could go between 20 to 25 minutes of a 30 minute session before they would get greasy. When they got greasy. You could feel them. Which is a good thing, because they told you what was about to happen.
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