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So I just bought a bike with Pirelli Diablos on it. I'm sort of a Michelin fan, I have always had good luck with them, and Karaya One here on the site sells them very reasonably.
I was showing my bike off to a friend who runs a bike shop, and he says, "Those tires are spent, you need new ones."
I dont think I need new ones; these look to be about 65-70 % to me. Is there something I'm missing? I know the Michelins had sweet little wear bars inside the tread so I would know when it was time. These Pirellis dont seem to have any wear bars.
I'll try to post up some pics tonight when I get home, but in the meanwhile - what do you guys wait for before you replace a tire?