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shomeurwit ,im looking at doing the same thing, as i cant find any other way to change my gear ratio on a toyota echo, im going to buy a cheap set of tires and rims off of craigs list if i can find them,,im going from a 175-65-14 to a 185-65-15, its .44 wider and 1.5 " taller (if i calculated right) ,at a steady speed on the highway,,,where i spend 60+% of my driving now, it should show improvement, . i understand that in city stop and go, getting the bigger mass up to speed could hurt fe. leverage and moments and other enginerring speak.once the larger mass is up to speed would'nt the larger mass have a slight flywheel effect?never seen that discussed. also larger contact patch as a result of larger diameter and slight width increase will increase rolling resistance,.i will soon know if it helps or hurts my specific case. i dont know if you can truly know if it will help or hurt until you try it.,,,so i am.
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