I own an 09 STR, I've run Bridgestone BT016's, Dunlop Q2/3's, Michelin PR2's, Pirelli Rosso's, Metzeler Sportec M05's and M7RR's off the top of my head that's what I can recall, the sporty tires tend to last about 2500-3500 miles, the sport touring tires lasted around 5-7k miles. The sport touring tires will give a slightly heavier feel to the steering because they usually are profiled differently and weigh a bit more, they will still provide most street riders with all the grip they need plus they usually have good wet weather performance also. If you are using all the grip they provide on the street you are getting close to a track pace on the road. I also own a Tiger800 that I run sport touring tires on, ones that come in a 19" front, they provide plenty of grip, I've had the Bridgestone T30's and BT023's, plus a set of Continental Road Attack EVO 2's, they all have been grippy enough to run out ground clearance before you run out of traction. If you are looking for more tire life, I would consider sport touring tires, given the fact that a Street Triple steers so easily, I doubt that you would be losing too much feel. The new Metzeler Roadtec 01's are supposed to be really good tires, I bought a set for the Tiger, I have a set of the Angels for the STR when I finish off the M7RR's currently mounted up. Out of all the different tires I've used on the STR, I liked the M7RR's and if I didn't get a deal on the Angels I would run them again.