defiancecp
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Re: range impact of wheels/tires

Mon Jul 25, 2011 5:36 pm

Actually, I think that's probably it - I had been thinking rolling resistance, but aerodynamic change makes more sense, and it does fit with the more severe loss on the interstate. I still plan on getting LRR tires next round anyway, as well as the sizing changes described above.

defiancecp
Posts: 367
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Re: range impact of wheels/tires

Thu Jul 28, 2011 8:26 am

Well, I thought I had found it this morning. Finally got time to check the pressures - 18-20psi all around!! wth??

Anyway, aired them up and off to work. Was a little pressed for time so I just went to 40 even all around; I'll be more picky about specifics later.

So far it seems like not much difference. Which surprised the heck out of me. I'm at 4.0 right now. still, it might have been a bit of improvement, since it was touching on 4.1 a bit; we'll see when I get a few miles on it. And I haven't checked the interstate mileage yet either.

Still, as soon as I saw the pressures I thought EUREKA! :) I'm shocked it didn't help more. Maybe I just had a bad-driving morning :)

LeafinThePark
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Re: range impact of wheels/tires

Thu Jul 28, 2011 8:42 am

As someone who has done more than a couple of triathlons and has a (unused) aerospace engineering degree, aerodynamics is much more of a factor here than weight. If you check out the tires bicyclist use on time trials, you will see either very deep 'dishes' or full disks. Even these wheels both tend to be heavier than standard spoked wheels, they result in less energy being wasted going down the road.

From a purely range perspective, the wheels should present a continuous surface...just get rid of any spokes/holes. Of course, this would probably look hideous.

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Last edited by LeafinThePark on Thu Jul 28, 2011 9:38 am, edited 1 time in total.
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LTLFTcomposite
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Re: range impact of wheels/tires

Thu Jul 28, 2011 9:30 am

drees wrote:Yeah - see those huge open spaces between the spokes of your new wheels? Those are perfect for sucking up and spitting out large volumes of air. Not good for aerodynamics.


Yeah but they are so money.

Civic hybrid wheels are like flat disks. Boring, but no doubt for a reason.
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TomT
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Re: range impact of wheels/tires

Thu Jul 28, 2011 10:03 am

If that didn't trigger a low tire pressure alert from the car, something is wrong. It is supposed to trigger at 30 pound (6 under the recommended inflation).

defiancecp wrote:Well, I thought I had found it this morning. Finally got time to check the pressures - 18-20psi all around!! wth??
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defiancecp
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Re: range impact of wheels/tires

Thu Jul 28, 2011 10:15 am

Really? Hm... They were definitely 18-20 psi all around, and didn't give the alert...

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aqn
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Re: range impact of wheels/tires

Thu Jul 28, 2011 11:17 am

Re. weight: we're not talking about just "weight". We're talking about weight in rotational components. Increase in rotational weight == an increase in moment of inertia == bad. How much worse? Don't know, but it's definitely not better!
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LEAFer
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Re: range impact of wheels/tires

Fri Jul 29, 2011 9:39 pm

mogur wrote:If that didn't trigger a low tire pressure alert from the car, something is wrong. It is supposed to trigger at 30 pound (6 under the recommended inflation).


defiancecp wrote:Really? Hm... They were definitely 18-20 psi all around, and didn't give the alert...

Or do they trigger if they (over a short period) lose 6 psi (or other preset amount) ?
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Dharma
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Re: range impact of wheels/tires

Thu Nov 10, 2011 1:48 pm

Nice my brother! Thank you for the informative information, while I hunt for a set of rims.

There is no reason these Leafs should't be as fun to look at as they are to drive. :D

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charlestonleafer
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Re: range impact of wheels/tires

Thu Nov 10, 2011 2:17 pm

I'm still wondering what the impact would be of replacing the wheels, with some lighter wheels, but keeping the same tires. There must be some calculations out there, not only for LEAFS, but for vehicles in general. If we could get some studies from another vehicle, at least we could get a starting point.
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