In the spring I replaced the Conti Motion tires that had come from the previous owner with a set of Continental Trail Attack2 tires, thinking that with the more aggressive tread pattern that I would have more traction on gravel, and as they don't make a 160 width rear I opted to go to 170 on the back. It was a good choice, and I got 15,000km out of them before they started to square off. The front scalloped and squared off, and later at 18,000 instead of tipping into a corner, it dumped into it.
Still, I had enough faith to reorder them from Pete's Superbike in early September, only to find that the rear tire wasn't in stock and wouldn't be until late October, so I cancelled the order and instead went with Michelin Pilot Road 4 tires that just got spooned on today at 39,250km on my odometer.
So far, in a 40 km dry run they've been great, although the handling of the bike will take some getting used to again, for the 160 rear likes to turn in quicker than the 170, so I find myself cornering without needing to lean off the bike whatsoever.
I'll report back later to tell you what I think of them in the wet and over the long haul.
The Continental tires are brilliant in both wet and dry, so much so that I inadvertently power wheelied in the wet with them a couple of times. They are confidence inspiring tires to be sure, until they square off...