[07e92]

Hankook just releases an EV friendly tire, iON evo AS SUV, https://www.hankooktire.com/us/en/tire/ion/evo-as.html, but it does not have size 275/40/22, can we put 285/35/22 instead?
https://www.tacomaworld.com/tirecalc...0r22-285-35r22

[Young04]

Originally Posted by 07e92

Hankook just releases an EV friendly tire, iON evo AS SUV, but it does not have size 275/40/22, can we put 285/35/22 instead?
https://www.tacomaworld.com/tirecalc...0r22-285-35r22

Your speedo will be off, but BMW tends to overstate the speed. With this new size, the indicated speed will be closer to the actual speed.

You will also lose some sidewall, which will negatively impact ride quality and make your tires/wheels more prone to pothole damage. 99mm of sidewall is closer to what you see in true performance SUVs.

But yes, as long as you stick with a square set, it can be done with any major issues.

[Pictor]

Here's a good way to visualize the difference in tire size. https://tiresize.com/comparison/

[VirtualGuitars]

Originally Posted by Young04

Your speedo will be off, but BMW tends to overstate the speed. With this new size, the indicated speed will be closer to the actual speed.

Of course the faster you go, the more “off” it will be since it’s exponential…

[Young04]

Originally Posted by VirtualGuitars

Of course the faster you go, the more “off” it will be since it’s exponential…

Yes, but even at 100mph, it's only 2.6mph off. My speedo is about 2 or 3mph fast at 60mph (as have been most of my BMWs). If I were the OP, I'd be more concerned about increasing susceptibility to pothole damage. The OEM tires don't have a ton of sidewall (110mm). I can't drive around with reckless abandon as I do in my Wrangler, but I don't have to be super careful to avoid potholes either. With 99mm of sidewall and the "extra" weight of an EV, I'd probably be about as cautious around potholes as I was in my M4. Defeats one of the reasons for getting an SUV.

[VirtualGuitars]

Originally Posted by Young04

Yes, but even at 100mph, it's only 2.6mph off. My speedo is about 2 or 3mph fast at 60mph (as have been most of my BMWs). If I were the OP, I'd be more concerned about increasing susceptibility to pothole damage. The OEM tires don't have a ton of sidewall (110mm). I can't drive around with reckless abandon as I do in my Wrangler, but I don't have to be super careful to avoid potholes either. With 99mm of sidewall and the "extra" weight of an EV, I'd probably be about as cautious around potholes as I was in my M4. Defeats one of the reasons for getting an SUV.

Almost every vehicle I have owned has been off by about 2 to 3 mph at 60 mph (BMW, GMC, Jeep). It’s more like 3 to 4 mph off at 90 mph. Of course I’m comparing this with GPS on my radar detector. It’s been pretty consistent from vehicle to vehicle.

I don’t know why vehicle manufactures don’t move to a GPS primary and speedo secondary (when GPS is unavailable).

[Paladin1]

It's a legal requirement in the EU for the speedometer to NOT indicate less the actual speed (i.e., to read 60 kph when you're actually going 65 kph), with stiff fines for noncompliance. German manufacturers have historically set the speedometer to read 2-3 kph over the actual.

[NomoTesla]

My 22" wheels from BMW leave plenty more sidewall compared to the 21" wheels on my Model S. I don't have any pothole fears at all in my iX w/ 22s. I also believe the type of tire has less impact on ride quality with the air suspension.

[VirtualGuitars]

Originally Posted by Paladin1

It's a legal requirement in the EU for the speedometer to NOT indicate less the actual speed (i.e., to read 60 kph when you're actually going 65 kph), with stiff fines for noncompliance. German manufacturers have historically set the speedometer to read 2-3 kph over the actual.

It appears that most of the vehicle manufacturers do this. Almost every vehicle I’ve owned rates the speed a little bit faster than actual speed.

[ricerboi]

So there are a couple issues here:

1. Load rating of the Hankook 285/35R22 is 106V vs our OE 275/40R22 which is generally 107. It's a very small issue.

2. Overall grip. I see why you went with a +0 for increased grip, but the Hankook compound will barely be enough for their testbed vehicles (a bunch of Hyundais and an i-pace). It will be sub-par for an iX50 and just plain unsafe for the M60.

3. Tire wear. I'm not sure if you're trying to save money by going Hankook and a shorter/wider tire, but it's going to wear a LOT faster than you think.

4. Ride comfort: I'm running a 285/45R22 for exactly this reason. I want more sidewall for comfort (it helps on crappy SoCal roads) and 285 width for increased lateral grip. Your iX is really going to suffer on ride comfort on a 285/35R22, even with air suspension. If you're in NorCal, your wheels will get destroyed pretty quickly as your roads up north aren't much better than ours down here.

5. Speedometer accuracy (as mentioned above). Speedo reports 3-4% faster than actual on stock tire sizes. You're planning on running 285/35R22 which is 2.6% shorter than 275/40R22 so that will compound. Effectively, you're capping your max speed from a speedometer reading of 125mph-130mph down at least 5.6% so you're capped out at a real speed of 118mph-123mph. (Cue the speed limit nannies.)

My recommendation: Go with Non-EV specific tires and give up maybe 5-10% range and save half the money on them, but also double the tread life. Good choices are Continental DWS and Michelin Pilot All-Season 4 for All-Seasons, and Michelin Pilot Sport 4S for something more sporty (non-winter) that you can run 275/40R22 in.

Or stick with OEM.

To each their own.

[NomoTesla]

I don't know if they fit the iX, but Michelin Primacies were always wonderful on my Model S. They also lasted over 30,000 miles on my P85 RWD.

[ricerboi]

Originally Posted by NomoTesla

I don't know if they fit the iX, but Michelin Primacies were always wonderful on my Model S. They also lasted over 30,000 miles on my P85 RWD.

I believe there may be an SUV version of the Primacy. The general problem with running passenger car-focused tires on SUVs is loading. A lot of muscle car tire sizes work with CUV’s like the 275/40R20 Front + 315/35R20 combo on my F15 X5 that also works on a Camaro. However, the passenger-car construction tires will probably last 30-40% less mileage on the CUV because although it will safely handle the weight of the CUV, the compound/construction isn’t optimized.

Everyone drives their car differently and has different needs (value/grip/comfort/noise/range/tire life) and it’s nice to have choices!