Rear tire on my 2007 GS is leaking slowly. Tire is a Tourance and has about 1500 miles on it. Had a screw in it earlier this year and got it professionally plugged and patched. However if i don't ride the bike for week or so, i notice tire becomes under inflated. I've decide i'm going to change the rear tire. I live on the east coast (NYC) and most of my riding is on streets and highway touring and I ride year-round except for when it snows. What is best tire for 95% street as I do not off road? Do I need to match the front or is it ok to keep the front (Tourance)? Thanks!