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There is not. It's a question of rolling resistance and lower profile tires just have more. Yay physics!Tesla says the performance tires with 22 inch rims lose 10-15% range. Would opting for different tires solve the issue?
I like the look of the bigger wheels. But I'm wondering if there is a workaround for the range loss.
I may be over-simplifying it, but imagine bouncing a solid rubber ball versus a steel ballbearing with a thin rubber coating. The solid rubber ball loses very little after each bounce, while the steel/rubber ball quickly comes to a stop. All that rubber is much more effective at storing and returning energy than the steel/rubber combination.I can't believe that this is true or "why" its true.
Aside from the weight...I can't imagine how there could be such a range loss.
The difference between a 19 inch rim and a 22 in rim ( 3 inches ) is like a rubber ball and a steel ball covered in rubber?I may be over-simplifying it, but imagine bouncing a solid rubber ball versus a steel ballbearing with a thin rubber coating. The solid rubber ball loses very little after each bounce, while the steel/rubber ball quickly comes to a stop. All that rubber is much more effective at storing and returning energy than the steel/rubber combination.
I would have expected that it was a matter of weight also. I'm having some wheels built for my new Tesla and I have the opportunity to select the weight of the wheel.My apologies,
I could be spreading misinformation (again). I've been trying to find the answer to this but it sounds like it's actually more about the mass of the wheel/tire combo that is the larger driver of the efficiency loss. So perhaps a lighter 22" wheel (than what Tesla offers) will actually be as efficient as the 20" OEM wheels.
My misinformation here is likely coming from the bicycle tire rolling resistance information I've been reading a lot about lately where larger volume, supple casing tires roll much more efficiently than smaller tires. Anyway...
Perhaps someone with more auto racing experience like @lolachampcar will chime in here and add some insight.
Cheers!
Edit: Here's one article I found that seems to back this up...
Effects of Upsized Wheels and Tires Tested - Tech Dept.
@Garlan Garner , in math and physics, it's sometimes easier to explain phenomena by considering the extremes. I'm not saying that 19" and 22" rims are like rubber and steel balls, but it's easier to see/understand the effect when you exaggerate the circumstances.The difference between a 19 inch rim and a 22 in rim ( 3 inches ) is like a rubber ball and a steel ball covered in rubber?
That's amazing. That's hard to believe, however I have nothing that says that you are wrong. Thanks for the information.
I agree with you concerning the weight.Yes, this primarily has to do with the overall mass of the wheel and tire combination. Metal wheels weigh more than rubber tires obviously and larger diameter wheels typically weigh more than smaller diameter ones. At steady state highway speeds, the weight difference doesn't have that much impact. However in stop and go or city traffic, the extra weight of the heavier wheels takes more energy to overcome the additional inertia. Also, it's not necessarily the total wheel weight, it is where the weight is distributed. Larger diameter wheels will have more weight further out of the wheel diameter. More weight further out = more inertia to start it rolling.
I would imagine a lighter forged 22" wheel compared to the OEM 22", would improve the range hit but will most likely never be as good as smaller diameter wheels. The sidewall stiffness of the 22" tires, with shorter sidewalls, also will play into the equation, but I believe the weight has the most significant impact.
I wish I liked the look of dark rims.@Garlan Garner , in math and physics, it's sometimes easier to explain phenomena by considering the extremes. I'm not saying that 19" and 22" rims are like rubber and steel balls, but it's easier to see/understand the effect when you exaggerate the circumstances.
A better analogy would be two 6" rubber balls, one with an inner 2" steel ball and the other with an inner 4" steel ball. Problem is, that this image isn't as easy to predict the outcome.
Anyway, I'm not saying that the elastic forces is the major contributor to the efficiency loss, but it definitely will play a part. As @goneskiian has indicated, weight probably plays more of a factor, and as @Zaphod correctly states, weight distribution is critical. I have a set of Cobalt RIMs (Crank Brothers) on my mountain bike that take advantage of weight distribution by having most of the weight near the axle. Makes a huge difference.
There are also benefits with going with 22" wheels like stiffness and handling.
Anyway, I'm waiting for a reasonably priced carbon rim to come to market.
So which is better? Weight toward the center or weight towards the outer?It's not just the weight but also the location of the weight. Even in a 22 vs 20 rim, there's more mass further away from the center of the axle in a 22" rim + tire than a 20" rim + tire. Wheel design might also come into play with the slipstream design being more efficient, causing less air turbulence than the 22" turbines.
Center. The rotational inertia increases as the square of the radial distance from the center, but the mass needs to go up too considering the increased circumference and the metal being of similar thickness, so now you are talking about a cubic relationship. So, if the wheel was just a rim with no spokes, it would be (22/20)^3 = 33% more inertia for the outer part of the rim.So which is better? Weight toward the center or weight towards the outer?
I agree that the narrower the tire the lest resistance, however.....I need grip in the rain. Right?I think to minimize losses you would want to get as light of a wheel and tire and possible (the tire being more important to save weight due to the way higher inertia required to get the weigh spinning and to slow it down the further away from the hub that it is). Also keeping the tire as narrow as possible would minimize frontal area and rolling resistance vs. the same tire in wider cross section. That is what the i8 has really narrow tires for a Sports car.
I agree that the narrower the tire the lest resistance, however.....I need grip in the rain. Right?
That's absolutely gorgeous.
We offer a line of forged wheels that are lighter than the 20" and 22" OEM wheels which incorporates the use of OEM components such as center caps, lug nuts, and tires. No need to fiddle with aftermarket hardware.
The wheel weight savings can range from 2% to 25% on all 22" MX series wheels.
22" Forged Wheels Archives - TSportline.com - Tesla Model S & Model X Accessories