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(.

 

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.

 

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.

 

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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Here is an old 59 post thread about this same brochure:
ID.4 Trim Differentiation

 

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)?

 

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.

 

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

 

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.