Quote:
Originally Posted by SaltLifeCC
yellj, a bigger tire means the cart travels further in 1 revolution than a smaller tire. While increased friction may cause getting going to take a fraction of time longer, the overall result is you cover more ground in the same number of revolutions, hence more mph. This is the same principal that causes speedometers to give false readings if using a smaller or larger tire than the speedometer was calibrated for.
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Finally, somebody else who understands gear ratios!