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Old 03-17-2014, 05:59 PM   #60 (permalink)
Ecky
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ND Miata - '15 Mazda MX-5 Special Package
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Quote:
Originally Posted by Honda View Post
Half turn will show as 100 inch not 50 on the odometer.
What about time? let say within one hour each wheel complete 1 turn, so the odometer will read 200 inch per hour for the big wheel and 100 inch per hour for the small wheel. means the bigger wheel is faster?!!
If the odometer is set to read one turn as being 100 inches with the small wheel, putting the bigger wheel on the same odometer will take you 200 inches while the odometer only reads 100 inches because it read only one turn, and it's set to read one turn as 100 inches. Going the actual 100 inches on the big wheel would only show as 50 on said odometer, because it only sees half a turn.

Time isn't a factor here, odometers are simply dumb "turn = this many mile" displays.


EDIT: Another way of looking at it is this: If 2000RPM = 50MPH with the stock wheels, if you replace the wheel with one twice as large you'll be moving at 100MPH even though your tachometer is still reading 2000RPM and your speedometer still shows 50MPH.
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