I have the stock 15 inch rim & OEM tires from Conti. I was playing on theTire Rack website a few weeks ago , exploring my options for when I need new rubber & I believe that you can replace the 175/65 tires on the 15 inch rims with a 195/60 tire.
Jeff
"Dorothy" '06 MC BRG/W
#151 in the GWRR

 

I stuck with the 15"ers and replaced the 175/65s with 205/60s. Now have much better handling, tho i did give up almost 2mpg. I got that back when I installed a drop-in foam panel air filter.