The rear tire was in reasonable shape when it first came, though a bit square in the center probably due to wrong calibration or use. Due to the ever present twisties in Norway, it is very unlikely a tire will be square on the center. After servicing the bike and doing no more than 4 short trips (like 300km each) since mid august, and driving to/from work, people at Minde MC always commented, "hey, your rear tire has seen better days". And when the cold salt on the roads came, with the engine cleaning because of daily use and getting more responsive (but still lean), I became a bit worried about getting too confident when the ground no longer provides the strong grip.
So I asked Jan Arthur for a new tire and he had it right away: a nice and shiny Metzeler 180/55-17 Roadtec M7 RR. Quite a long specification indeed, but in short it is a general consumer tire tested at ManTT and was barely slower (less than 5s on a 6 minutes lap) than racing tires, that are not available for public sale and most likely cost the teams a lot of money.
It is the same tire I am using on the front, and now the bike is very, very well balanced, flicks fast and the grip is superior even on the cold salted roads... provided I don't do anything stupid, of course. If you are in for new tires, my advice is not to skimp on brakes and the rubber, save on something else but put the best shoes possible on your bike. Out of the money I already spent repairing the RF, this pair of M7 Metzelers was my best investment.
Below you see how it looks like. It makes the big ass of the RF look even bigger, which is fine for me since I love a big ass. And as people say about this bike's unorthodox tail end, they won't see you coming, but they will definitely see your leaving. WoW players will remember this quote from Nagrand (Burning Crusade). XL = Extra Large.