I got about 10k out of a rear diablo strada. if you keep an eye on the TWI you'll be fine. unlike some other tires, when you get to the TWI, the tire is toast. and if you are going on a long ride and it's close, better to be on the safe side. I commute 150 miles to the office so I had time to really see what was happening as I got close to the wear indicator. I ran it till I could see the differentcolors that others talk about, but I knew the tire was gone before then. so far I have 13k on the front tire but it's toast as well. willhave a new one later this week hopefully.It would be nice if the z6/strafa had center wear indicators. However, I would humbly suggest that if one is wearing a tire to the cords before hitting the wear indicators that are off the center line that a touring tire would be a better choice of rubber rather than a Sport-touring tire.
but I like the handling. makes the bike feel much more flickable like a proper sport bike.
BTw you don't want a solid line down the center of the tire. tracks rain grooves too much.