Still have my stock Bridgestone tires at over 13,000 miles. Looks like if I'm willing to erase the wear bars they will go to 15,000. Either way I have to start looking at replacements now and have done a bit of research on two different tires. Michelin Pilot 4s are highly recommended but expensive at about $345 a pair. Diablo Rosso II go for about $160 a pair (after $40 rebate). Radial versus standard. Both seem to have reputations for tenacious grip. I'm certainly interested in grip, but if grip is equal I'd like the lower cost one when you factor in how many miles they will go before replacement.