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Old 04-03-2014, 01:49 PM   #121 (permalink)
NeilBlanchard
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All else being equal, a large(r) diameter narrower tire will have lower rolling resistance and lower aero drag than a small(er) diameter wider tire.

One reason is that a larger diameter tire will 'bridge' across unevenness of the road better. Another is that since a tire is essentially 'wedging' the weight of the car uphill constantly - a larger diameter tire has a mechanical advantage, because the 'wedge' it provides is a lower angle.

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