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Old 10-12-2023, 03:46 PM   #11 (permalink)
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Originally Posted by CapriRacer View Post
Too many variables. The RR varies wildly within a given tire size, but the difference between the same tire in different sizes is fairly small.
More concerned about highway mpg

For example in the Hyundai Ioniq hybrid, going from the limited version of 17 inch rims to 15 inch rims, the highway mpg increases almost 5mpg

Also on the new Prius, dropping from the “ premium model” with 19 inch rims to the base model of 17 inch rims, you also get a 5 mpg highway gain.

I was just wondering what would happen if you down size another 2 inches, and maybe even get an even lighter alloy rim

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Old 10-12-2023, 05:15 PM   #12 (permalink)
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The Volt rides pretty close to the ground,

195/65r15 Ecopias might improve fuel economy (less undercarriage drag)

But the you would get hung up on every bump.
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Old 10-12-2023, 06:08 PM   #13 (permalink)
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https://en.wikipedia.org › wiki › Speed_bump
Speed bump - Wikipedia
Speed bumps (also called traffic thresholds, ... speed humps have a traverse distance of about 3.7 to 4.3 m (12 to 14 ft) and span the width of the road. The height of each hump ranges from 8 to 10 cm (3 to 4 in). ... The Department for Transport defines the regulations for the design and use of road humps.
Anything more is offroad.

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