As mentioned, normal wear for these tires.
Quote:
Originally Posted by LateralGsIfYouPlease
- I used chalk on the sidewalls to monitor pressure; I ended up letting a couple pounds out of the front and more out of the back during the course of the event. The chalk method always worked well for me with previous tires (the stock tires, then the Indy 500s). Using that method, I normally end up doing the same thing, taking more pressure out of the rears than the fronts. So I'm not sure what went wrong this time. The fronts did wear down below the triangle indicator more than usual, but I didn't think it was that bad so I didn't pump any more air in during the event.
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I think the chalk method is better suited for bias ply tires, and those little arrows just point to where the treadwear indicators are, i don't think they are intended to be used to set pressures. Just aim for 34-36psi hot...