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Another thing to consider is tire selection for a 12" rim. For the most part we are all stuck buying what ever tires are manufactured. In a perfect world I'd love to run a 32x9.5x15" tire on my Jeep, but no one makes it. 13" and 14" rims and smaller tires sizes are slowly being phased out, so your choices in a smaller rim and tire selections drop.
In Darin's case I think he was shooting for the lowest RPM he could run without lugging the Metro. And he would have had the same final effect running 16s and some big arse tire as the gear swap. Only catch would be that he would be suffering from the effects of being under geared all the time. With the gear swap, he only takes a major hit when he is in his higher gears, otherwise he is accelerating more or less normally
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