It's been cold and dry here in LA with a lot of wind and dirt.
I was taking a left had turn late last night, not real fast and not putting much torque on the rear wheel as I accelerated out of the corner, but the rear wheel slipped about 6" to the right just as I was straightening out.
I stopped and went back to see what I slipped on and found nothing obvious. The surface was a bit grainy and the turn is a slight reverse camber where the bus tires have created a groove, but no oil or liquid of any sort. I ran my rubber soled shoes over the surface and they slipped a bit, but not out of the norm.
I then u-turned to go back in the direction I was originally heading and again I was able to get the back tire to slip a bit. This time I did it in on purpose, but it started to slip well before what I'm used to with these tires on a dry surface.
It kinda shook me up on a big picture level, 'cause I take corners way harder than that and I want to know I can depend on the tires gripping.
I believe I'm on the Metzler Z6s, and they are old.
Even if the wear on the tires is the reason, I might be interested in switching to stickier tires. All my riding is Urban stop and go, so grip is everything.