I went up 3 sizes on my sidekick. From a 205 75 r15 to a 235 75 r 15. It throws the speed o off a good 5mph. I can tell a big difference between 4th and 5th gear now. There is no more inbetween those ranges. I can still manage 30-32mpg and keeping up with traffic at a few 100 less rpms. Best of all, no rubbing.
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