Ok guys and gals,
  I am now riding and was looking at my rear tire.  I am going to need tires by the end of the season.  I have three questions, first what is the best tire on the market for a Savage carrying a 240lb. man around with an occational 110lb. lady with me.  Considering cost and reliability as well as traction.  And second if I stick with factory replacement tires, which are IRC Grand high speed GS-18F on the front and IRC Grand High SpeedGS-18R on the rear, am I sacrificing performance by not going with another brand?  And finally is there a better size tire I could get that would fit and give me a better ride without changing rims?  I have 100/90-19 on the front and 140/80-15 on the rear.  I ride a lot of curvy roads in the mountains but also use my bike as a daily commuter and hit the interstate highway often as well.  Any advise would be appreciated!

i put nearly 7K miles on Kenda Challengers F & R after replacing the factory originals that were dry rotted/worn out + went up to 140/90 on the rear made the speedo read more acurate as well - p.s. I was 430+ when i started riding the bike and was at 350 when I sold it a month ago.....and the tires were still like new.

I'm suggesting Metzeler ME880 touring (stock sizes for front and rear), they have super strong sidewalls, sticky.. I've been riding mine like crazy and they still have the knobbys.. my Shinko 777s would be dead by now, and the IRCs dry rotted... kinda pricey but if you can get your dealership to match an online price minus the shipping they're worth every penny.