How can I get the best onroad handling of my Offroad X? In winter my OR is offroad every day - I live in rural New England at the end of a steep dirt road. But in summer it's mostly interstates - I'm thinking Goodyear Fortera's as a second set of tires.

My question is whether to switch just the tires or go to the expense of a second set of 17" rims. Will it make a noticeable improvement for highway handling?

And if so, what size? My stock OR tires on 16" rims are 265/75-R16. On the SE model 17" rims, the tires are 265/65-R17 but these would not add up to the same diameter as the OR tires. To match the diameter on 17" rims I would need to go 265/70-R17.

Anyone who can check my calcuations?