Originally Posted by Dino de Laurentiis
For those living in colder and wetter climates (Iím in Scandinavia myself), the Metzeler M7RR are amazing. Slightly quicker turning than the RossoIIIs and grip in the wet and cold is fantastic. I was out yesterday, perhaps the last longer ride of the season, some 260-270 km in all. Temps were in the 12-14 C range, and roads were occasionally quite damp. However, even on the fully damp spots, grip was excellent, better than it has a right to be honestly. I was running quite hard, but never even felt as much as twitch on braking or acceleration. Mileage is much improved too, I replaced my RossoIII rear at around 5000 km, and now have about the same on the M7RRs, with at least 1500 km more in them, possibly even more.
Admittedly apples to oranges somewhat, but I've got the M7RR's on my S1KRR not my SuperSport, but riding often in the 0-5 degree Celsius range, I would say I'm more confident on the Rosso IIIs. Wet wise, the M7 might have a slight edge, but only if it isn't cold.
I also found I squared off the M7RR's WAY faster than I squared off the Rosso IIIs. Most of my riding is on freeways, so flat without too many curves. Still plenty of rubber on the M7, but the handling is noticeably affected after 7500km. I got about 9500km on the Rosso III rear.