Not many aftermarket wheels are aerodynamic....you will have to choose wisely on this. Revolution per mile will be same.... if you choose proper size of tires.

 

So lets say that I purchased the 18in Wheels and tires for the SE (I won't since I don't think they are that attractive) but hypothetically, the car will recognize/re-learn the rotations per minute and adjust the mileage accordingly?

 

Being attractive is opposite from being efficient. For as long you choose same revolution per mile tires...there will be no error on speedometer or mileage count.
Fast EV are one of good aerodynamic wheels and they look great.
Here is example....you can also do murder out in black.

 

Thanks - appreciate the info. Those are nice looking (and efficient wheels). I'll see what else they have to offer.

 

On my Tesla S long range they deliver better efficiency than aerodynamic wheels from Tesla.

 

Interesting. I just looked on aftermarket ev website and there are no wheels listed for the IONIQ 6 yet. I did chat with them and they told me that they'd check with Fast Wheels tomorrow and that they didn't have the specs yet for the IONIQ 6 wheels.

 

The Ioniq 6 SE Wheels and Tires -
Wheels: 18 x 7.5 J Alloy, with a 51 mm offset (also sometimes called ET51) - OEM Part Number 52910-KL110
Tires: Hankook Ventus S2 AS or Nexen NFera Sport 225/55R18
Bolt Pattern for all wheels: 5 x 114.3

The SE 225/55R18: ------------- Diameter 27.7", Width 8.9", Sidewall Height 4.9", Circumference 87.1", Revolutions per Mile 727
The SEL/Limited 245/40R20: -- Diameter 27.7", Width 9.6", Sidewall Height 3.9", Circumference 87.0", Revolutions per Mile 728

The width of the SEL/Limited Wheel & Tire combo is 7.9% wider than the SE; thus more area pushing through the wind.
Rubber is about 1/2 the mass of aluminum, so more mass in the SEL/Limited Wheel & Tire combo.
More air churning in the SEL/Limited Wheel design.

Your Ioniq 6 will not know you have changed wheels and tires, as the Revolutions per Mile are essentially identical. Only you will know...

 

Thanks for the detail. I’m still not following - if I do change from the 20s to 18s, is my mileage going to increase? Meaning when I charge to 80% now I get about 258 miles. If I change to the 18s, am I going to see an increase in mileage when I charge to 80% with those wheels/tires?

 

Yes....entire Ioniq 6 is built around 18 wheel ...So aerodynamic properties will be much better than 20 inch wheels.

 

Real world test of mileage gain with smaller tires on Model Y - 11%

How much does wheel type affect range? Stunning results of Model Y Performance test

For a City Slicker, bigger tyres on a Model Y Performance are fine. If you plan on long distance driving, the energy wasted may be an issue.

thedriven.io

 

And difference between aero rims and normal rims is about 3%: Aero-Wheels from Tesla reduce consumption by three percent

So going from 20" to 18" is going to increase your range by quite a bit. Whether you opt for aero rims or not isn't that much of a concern. Most important factor is still the tire's width.

 

I'm not a fan of the SEL/LE wheels. My take is that the fractal look takes away from the smooth lines of the car. I wanted something more simple like a five spoke. After researching a bit, my local tire dealer thought that these would work well.
Kraze Wheels » 190 LUSSO

However, though they look pretty cool, they might be inefficient compared to the FAST EV ones shown above. I've definitely noticed that all of the new EV wheels are more "closed" on the face than traditional wheels (makes aerodynamic sense). Has anyone found any other options?

These are cool, but the branding is a little brash and they are discontinued.
TR9 | Black/Machined Face/Machined Lip | Touren

 

Hyundai would sell more RWD SEL’s if they gave customers the option to select the 18” tires because that would increase its range to 361 miles like the RWD SE. correct? If not, why?

 

 

https://www.reddit.com/r/Ioniq6/a/13cs2k4/fast_ev01_wheels/

 

I think 18" tyres will have a lower rolling resistance than 20". The super-low profile "sporty" tyres tend to be optimised for maximum grip & cornering, so are often a softer, grippier rubber which flexes a lot more as it contacts the tarmac, and wastes a lot more energy as heat in doing so. Harder rubber is more like steel tyres on a train, which lose virtually no energy as they rotate, but also don't have much grip at all.

Also the cross-sectional area inside the tyre is smaller, as it's a thinner tube in effect. So the air that gets circulated internally is being squeezed at the region of road-contact, and so gets pushed around a lot faster, again losing a bit more energy.

Simply put, 18" tyres are generally optimised for comfort & range over sportiness & grip.

The tyre mfrs are reputed to give te car mfrs a bigger discount on tyres if mfr uses the expensive low-proflie ones, so that may be a factor in H pushing the 20s over the 18s. Tyre mfr expects to clean up nicely when the car needs a new set of tyres down the road.

 

You posted this video on a different thread. I found it very interesting and it seems relevant here.

 

Alright then, I made the switch to the 18" wheels on the SEL. These are Niche Milans.

1) I like that the wheels are more minimal and allows the airfoil design aspect of the car to shine through.
2) I'll benefit from the 18" wheels that are less heavy and have less width wrt aerodynamics that provide for better performance.
3) The tires/wheel look is not as svelte, but it gives the car a retro/future aesthetic.
4) The larger tires will keep the wheel's from getting curb rash/rubbing when parking.

Here is a 1973 Porsche 911, which is the look I was kind of after.

I'll have to follow up to see what % range increase I see.

Cheers

 

looks like your new wheels have HUGE air gaps between the spokes. If that is the case, you won't be getting much/any improvement in range. The Factory 18" wheels are almost totally enclosed, there is little/no gap, just black paint, which accounts for the extra efficiency.

 

You missed some of the comments at the start of this tread. The wheels have less width so are more aerodynamic that way. Plus, I'm seeing better mileage because the wheels are less heavy and need less power to get up to speed. I'm seeing a 10%-12% increase in the KW/mi over the base SEL wheels.

 

There is a clip I have seen for the Fast wheels had the fill panels added and know difference was observed. Will try to find it, very interesting.

 

Found.

 

Consider giving low rolling resistance tires high priority to get the mileage improvement you’re looking for. “Green” tires and low noise very important for BEV, they are not cheap

 

i dont care about mileage. i want comfort. when these tires wear out, or maybe before, ima going to an 18" and tires with more sidewall so the ride is better. on our sonata, we went from 18's down to 17's, and the ride was much improved. in the old days, going to a larger wheel and a tire with less sidewall gave better steering response, but this is not a race car. it does not need more "sporty" handling. it needs quiet and smooth

 

And for many...range.