Wore out my original rear tire on my x at 4000 miles, but the front was still great so I just replaced the rear with a 150/70 Distanzia. Had to mess with the geometry and air pressures to get to run smooth at speed, without head shake at speed, but it was pretty good. I finally stopped trying to wear out the front, and yesterday at 8200 replaced it with a 120/70 Distanzia, even though that darned front tire still has lots of life in it. I weigh 235lbs, ride WFO on the highway and can't wear out that tire! Anyway I like the bike better with the matching Distanzia's now. SMOOTH.......