I have the stock Pirellis on my 620. It is just about to roll 7000 miles. My mechanic said they are worn out due to taking off too fast! OOPS! I may have done that um...more than a few times..everyday! Anyway, should I stick with the Pirellis or try something new. I have done a lot of riding over the last 6 months and I want a tire that will last and take the AZ heat. Am I a typical rider here or did I go a little crazy with my riding? How often do you all change tires? Also, what is a good/average price? Thanks!