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The attached document shows details about the U.S. version of the Pro, Pro-S and AWD versions. The most notable thing to me was the appearance of the 19 inch wheels in the non-gradient models. It is not just a smaller version of the Gradient wheel. It is a different design.
 

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I am interested in how the 19-in wheels affect efficiency!

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I am interested in how the 19-in wheels affect efficiency!

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Everything I have read suggests that smaller/lighter wheels increase EV range. There was a study done with a Tesla Model 3 that showed 20 inch wheels had a 40 mile decrease in range over 18 inch wheels. One issue is the weight of the wheel; the other is that larger wheels have a higher rolling resistance ( it takes more energy to get the wheels rolling(.
 

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I am interested in how the 19-in wheels affect efficiency!
I expect a 5-10 mile increase in range, depending on speed. Somebody will do some good tests of this since VW is not giving us that data.
 

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ID.4 FE GW
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One issue is the weight of the wheel; the other is that larger wheels have a higher rolling resistance ( it takes more energy to get the wheels rolling(.
"Rolling resistance" usually refers to the coefficient of friction between the tire and the road, independent of the non-tire components of the wheel.

A high moment of inertia will require "more energy to get the wheels rolling." That is a function of the wheel's mass, radius / diameter, and the radial distribution of the mass. One thing to keep in mind that a high moment of inertia will also keep the car coasting longer, and some (but not all) of a wheel's rotational energy can be captured via regenerative braking.
 

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I'm looking forward to seeing the black/brown combination in the PRO S Gradient. Hopefully we will see some pictures in the near future as they begin to be delivered.
 

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ID.4 1st Edition White / Lunar Grey
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"Rolling resistance" usually refers to the coefficient of friction between the tire and the road, independent of the non-tire components of the wheel.
In addition, a larger wheel necessitates a lower aspect ratio tire, and generally speaking these slim sidewalks require higher inflation pressures to prevent damage. They're not allowed to deform as much (which is why people complain of harsh rides) . As such, they have improved rolling resistance — but not by a wide enough margin to make up for the weight penalty of the larger wheel.

Of course anyone can over inflate their tires on 18" wheels and achieve much of the same effect while decreasing comfort and handling.
 

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Thanks, but I'm actually looking for a quantitative answer. I realize that's likely not available as yet, but i will be looking!

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Maybe that is why the Pro is EPA rated to get 10 more miles?
Yes the smaller wheels are the biggest part of that, and the Pro weighs 110 pounds less which gains a few miles range.
 
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In cars that have optional wheel sizes, generally the tire's outside diameter is the same for 18", 19", or 20" wheels. The thickness of the sidewalls is less on the larger wheels, of course. The heavier weight of the larger diameter wheels results in more unsprung weight, and add to that the stiffer sidewalls of the lower profile tires, and you get a harsher ride. Braking and range can be impacted, too. I have seen a test that compared 18", 19", and 20" wheels on VW GTI's, and the 18" gave the best ride comfort, but the 19" wheels gave the best overall result of the three in handling and ride.
 

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ID.4 Pro S Gradient AWD pre-ordered 9/23/2020
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I think the shirt answer is yes, the smaller 19” wheels that will be standard do (marginally) affect range in a positive way. The Pro was just EPA-rated at 260 miles of range. I’m sure the slightly lower overall weight, and the smaller 19” wheels are part of that minor difference in rated range.
 

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In cars that have optional wheel sizes, generally the tire's outside diameter is the same for 18", 19", or 20" wheels. The thickness of the sidewalls is less on the larger wheels, of course. The heavier weight of the larger diameter wheels results in more unsprung weight, and add to that the stiffer sidewalls of the lower profile tires, and you get a harsher ride. Braking and range can be impacted, too. I have seen a test that compared 18", 19", and 20" wheels on VW GTI's, and the 18" gave the best ride comfort, but the 19" wheels gave the best overall result of the three in handling and ride.
So, are the lower profile 20" wheels likely to stop the car faster? Or is it mostly dependent on the tires , i.e., the 20" Bridgestone Alenza vs. the 19" Hankook Kinergy AS x ev that come on the Pro and Pro S (w/o gradient)?
 

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So, are the lower profile 20" wheels likely to stop the car faster? Or is it mostly dependent on the tires , i.e., the 20" Bridgestone Alenza vs. the 19" Hankook Kinergy AS x ev that come on the Pro and Pro S (w/o gradient)?
Here was a comparison Car & Driver did in 2010 with a Golf - they tried sizes from 15" - 19" (while trying to keep the same tire as much as possible).


2848
 

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Here was a comparison Car & Driver did in 2010 with a Golf - they tried sizes from 15" - 19" (while trying to keep the same tire as much as possible).


View attachment 2848
The issue I see with this comparison is that not only does the rim/sidewall change but the tire width does, as well. As such, the performance and braking improves with the wider tires (more rubber on the road, so better traction). The comparison needed is a test with a change in rim/sidewall while keeping the tire width the same (235 front width, 255 rear).
 

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The issue I see with this comparison is that not only does the rim/sidewall change but the tire width does, as well. As such, the performance and braking improves with the wider tires (more rubber on the road, so better traction). The comparison needed is a test with a change in rim/sidewall while keeping the tire width the same (235 front width, 255 rear).
I agree. Soon people on here will get both 19 and 20's and can swap. That would be a good test to compare both range, handling and comfort of each tire/wheel on the same stretch of road where you usually drive. Or 2 people on here go for a test drive together to compare their 19s and 20s to each other.
 

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I can't imagine why the dynamics would be different from basically every other test of this nature: 20s better handling, rougher ride, shorter range; 19s more compliant handling, softer ride, longer range
 

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The attached document shows details about the U.S. version of the Pro, Pro-S and AWD versions. The most notable thing to me was the appearance of the 19 inch wheels in the non-gradient models. It is not just a smaller version of the Gradient wheel. It is a different design.
I think so.
 
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