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Old 12-29-2015, 02:52 PM   #1 (permalink)
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EV wheel/tire size advantages for range?

Wouldn't larger wheel/tire diameters have benefits for EV range, all other dimensions such as weight and width and LRR qualities being equal?

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Old 12-30-2015, 01:23 PM   #2 (permalink)
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Yes, and the evidence is the most efficient EV - the BMW i3 - uses the 19" 155 Bridgestone front and 19" 175 rear.
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Old 12-30-2015, 02:40 PM   #3 (permalink)
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Quote:
Originally Posted by NeilBlanchard View Post
Yes, and the evidence is the most efficient EV - the BMW i3 - uses the 19" 155 Bridgestone front and 19" 175 rear.
Thanks for that. When I hunted online I saw a lot of unconvincing answers... unconvincing because they did not seem to appreciate tne multiple variables involved. When I was building my ebike, the calculations for a larger power-wheel showed higher speeds and ranges with the same motor. I still chose a smaller wheel because I did not want more speed, got my range through battery sizing, and wanted more torque at lower speeds than I would get with a bigger wheel (hill climbing was a big priority).

When I started ecomodding my civic 5 years ago, it was with the idea that it might be my last ICE. Cool OEM EVs are starting to appear on the used market... I start dreaming.
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See my car's mod & maintenance thread and my electric bicycle's thread for ongoing projects. I will rebuild Black and Green over decades as parts die, until it becomes a different car of roughly the same shape and color. My minimum fuel economy goal is 55 mpg while averaging posted speed limits. I generally top 60 mpg. See also my Honda manual transmission specs thread.



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Old 12-30-2015, 05:21 PM   #4 (permalink)
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What about "stop and go" where a lot of ev's spend much of their urban life?
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Old 12-30-2015, 06:29 PM   #5 (permalink)
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Originally Posted by MobilOne View Post
What about "stop and go" where a lot of ev's spend much of their urban life?
The key is to keep weight down at least as low as the OEM wheel/tire combo. Tires are not all the same weight. Another thing to keep in mind is how far from the hub the weight is. The further from the hub, the greater the effect on rotational mass when a car is accelerating or decelerating. Thinner, taller, lighter wheel/tire combos would be the way to go... hence BMW 19" 155mm wheel/tire combos on the i3.

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See my car's mod & maintenance thread and my electric bicycle's thread for ongoing projects. I will rebuild Black and Green over decades as parts die, until it becomes a different car of roughly the same shape and color. My minimum fuel economy goal is 55 mpg while averaging posted speed limits. I generally top 60 mpg. See also my Honda manual transmission specs thread.




Last edited by California98Civic; 12-30-2015 at 06:30 PM.. Reason: typos
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