I just put on the Road 5 150/70 17 and the Excedra 240/55 16 and the difference in handling is night and day (2011 R3R.) It takes a little more to get her into the turn, but once going...she goes. Scared the bejeesus out of me my first time. On the flip side, I didn't feel any slipping of the tires or that she was going to fall flat on her face (well, my face, her side.) I still don't have a lot of miles under this combination (about 45 so far) but I don't think I'd want to go back to stock set up.