I'm new to this Forum and not certain yet how the different Threads link? I made this following Post on another Thread but when I read this one, I thought it would be appropriate to copy it here. I'm in the market for new tires for my 2009 GSA and really appreciated this Thread. I thought I'd share some of my own experiences as it may help a few of the folks that are considering the Tourance, PR4 Trail &/or PR4GT. I've had two sets of Metzler Tourance on my GSA; the first set went 11,500 miles and the second set went 12,500 miles. I then switched to the PR4 Trails which now have 10,000 miles on them and they're done. The Tourance were great tires all around, but the PR4's were definitely quieter and better on pavement, both wet and dry. That said, I got 20% less life out of them. I should clarify that the majority of my riding is pavement, long distance and loaded with about 460 lbs between humans and gear. And we don't get passed very often. I found both tire brands worked the exact same on gravel and hard-pack; I don't mess with mud much on this bike. I was not able to find a PR4 GT for my GSA but did put the PR4 GT's on my K1200S. These tires handle really well on that bike as well but I'm not going to get any more miles on them than I did the PR4 Trails. Different bike but suspiciously similar tires in every way!! The other thing to note is that I always change my tires as a pair even though the front tire has atleast another 5,000 miles, if not 8,000 miles, left on it. For the price, it just doesn't make sense to me not to change them both at the same time. And with all of my tires, I'm careful the last 2,000 miles because they're definitely showing a significant flat spot. But I've never run them down to the wear bars. Lastly, I always follow Manufacturer recommended Tire Pressures; 32 Front & 36 Rear Empty and 36 Front 42 Rear Loaded; and I watch this like a hawk. Hope this helps. And now that you know how I'm riding, let me know if you have any other suggestions. I'm due for tires NOW!! I'm considering the Perelli Scorpion Trail II? I'm intrigued by the Continental Conti Trail Attack 2 and the Bridgestone Battle Wings but have never had good luck with these Brands on vehciles? Metzler has the Roadtec 01 that looks interesting, in fact, a lot like the Michilen Pilot Road 4 Trails? All that said, even though the PR4's are more money and lower mileage tires in my experience, I've certainly been the most impressed with the ride they provide me. And given I'm a big fan of "Siped" tires, I'm leaning towards staying with the PR4 Trails. Again, any thoughts on these other tires would be appreciated.