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Old 11-28-2007, 03:09 PM   #7 (permalink)
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Location: 1000 Islands, Ontario, Canada
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Blackfly - '98 Geo Metro
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Originally Posted by 95metro
Plus it does nothing for you since you already have the "free" transmission. It's a lot of work for an "experiment" isn't it?
Well, there's no doubting it would help my overall mileage. The only experimental question is whether it would hurt the car's driveablility so much that I wouldn't like it. That's why I would just try the oversized wheels/tires if I had access to some that would fit.

Assuming I was OK with the driveability, I would still switch back to the smaller wheels and tires and do the swap because of the aero, LRR, and rotating mass advantages of the OEM tires/wheels setup (assuming the bigger wheels/tires combo is heavier).

I have read a few posts talking about rotational weight and how important it is to keep that to a minimum. What is that all about and how much effect will what I am doing have in that respect?
Rotational (ie. drive train) mass takes much more energy to accelerate and brake than other vehicle mass - 7 times as much, if you believe this page: - So reducing rotational mass will particularly help if your driving is not primarily steady speed.
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