Quote:
Originally Posted by Red Herring
This is a picture of a Dunlop D211 that has been ridden on at the wrong temperature. These are road tyres that are simply moulded without tread so they are the same compound/construction. All that has happened is where I have been getting on the throttle coming off the bends the surface has started to tear away. Fortunately I felt it happening and stopped before it was completely wrecked. Treaded tyres are slightly less susceptible to this as the tread allows the rubber to move and heat up, but hopefully you get the idea.
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It's called "cold shearing".
How much did you lower the tire pressure to get it to stop? Too low and the tire will overheat, which makes them lose grip and wear out quickly too.
Tire vendors at the track will usually offer good starting points for setting tire pressures, but you still need to keep an eye on them, conditions do change through the day.