Different Diameter Tires on Front and Rear Axel?

[tlen]

I recently ordered snow tires and new wheels for my MYP as well as the MPP 1.75" lift kit. (a similar set up to what is discussed in this thread).

I got slightly wider and larger diameter for the rear axel vs the front axel (255/60R19 rear vs. 245/55R19 front), mostly for aesthetic reasons. I'd like as large tires as possible. Other threads here suggested not exceeding a certain diameter for the front tires to avoid rubbing, but rubbing shouldn't be an issue for tires on the rear axel.

However, after ordering, it occurred to me that I don't know much about the drive system on Teslas. Other threads seem to suggest that having non-stock diameter wheels could affect the Speedometer, among other systems.

So my question is: has anyone tried different diameter tires on the different axels? Were there any issues with the set up? Or, would anyone anticipate issues with the setup?

 

[Watts_Up]

Using tiresize.com comparison there is a 4.5% diameter change.
I wonder if this might confuse the Traction Control.
Maybe the TC will try to slow down a wheel using a brake?

Imperial values



Metric values

 

[Watts_Up]

I believe that the front wheel have a size limitation
because of the front suspension knuckle bolt above the tire axial.

I wonder if a rear 265/50R/19 (-0.7%) or 255/55/R19 (+1.4%) would be preferable than a rear 255/60R19?

Alternate tires size

 

[TomB985]

There's no mechanical reason why you can't run different-diameter tires. The drive systems aren't physically linked like conventional ICE-powered cars, so you can't burn out clutches by turning at different speeds.

The Model Y Performance comes with staggered factory wheels with different diameters. The rears are 0.6" taller than the fronts. Watts_Up makes a good point about clearance and possible TCS confusion, but I don't think a 4% difference alone would do it. If they clear, I'm guessing it would be fine.

 

[Watts_Up]

@TomB985 you might be right, the issue with Traction Control
would be for different tire size on the same axial, like with a spare tire.

Also when taking a curb, every wheel turn at a different speed.
Only when one wheel starts spinning,, the TC then trigger the front motor.
I wish there was a way to lock the axial when driving on a muddy road or snow.

Also it is not possible to manually to have the front motor running.
I wonder when the car preheat the battery before going to a supercharger,
if the front motor is engage because its noise if very noticeable.
I believe that the Hyundai EVs are going into 4 wheel drive in towing mode.

 

[TomB985]

My RWD Model 3 would "buzz" the motor when preheating the battery, and it didn't have a front motor to play with. I've never noticed any strange noises from mine when accelerating hard, so I don't think the front motor is inherently noisy. One of these days, I'll get another OBD pigtail to actually see what's going on.

 

[MYHUN]

I am new on the forum, any update on this topic? I have a MY LR 2023 as well a M32019 and I am interested to put larger diameter tire on the back for winter to get the most ground clearance. I have currently 245/50/19 on all tires, but I do not like that the rear tire looks small compared the space available around the chassis. I am wondering to upgrade it to a 255/55/19 on the rear. That would give 35mm ~1.4 inch difference in diameter between front and rear tires. Any idea, if that will not kill my MY? Anybody has similar size difference between front and rear? I know the speedometer will show less than actual speed, but 2-3km/h it is not significant.

 

[dafish]

Lore on this forum says a greater than 1% mismatch sets of errors. I’m not clear the significance of same

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[MYHUN]

I know the MYP has half inch difference between front and rear, so that is beyond 1% already, unless I am wrong. Which track have you read that statement? Thanks.

 

[dafish]

Lord only knows where on this forum I saw that.

MYP is under 1/4“ as I recall. Within 1%. plenty of tire size calculators around, feel free to look. Or not

 

[MYHUN]

Lord only knows where on this forum I saw that.

MYP is under 1/4“ as I recall. Within 1%. plenty of tire size calculators around, feel free to look. Or not

I have red around and indeed, it might be a good idea not to play with it after all. Thanks for the quick response.