Suspension Clearances for Wider / Taller tires

[KirillK]

OK, I did it!
Michelin Pilot 4 All Season, 265/40/R21 in the front, 295/35/R21 in the rear.
Before digging into this, I never noticed how much side walls on rear tires bigger then in the front Now front and tires are exactly same size from the side, and wide stance from the rear looks great. These tires don't have foam inside like stock tires, so they are slighly louder, but way softer on the highway, you feel less bumps.

Regarding TMPS - I went from 42 PSI on stock tires to 38 PSI on these ones. There are no TPMS warnings.
Regarding speedometer - I checked before, going 72 mph on the straight highway with a certified GPS speedometer, Tesla was showing 74 on the dash. I realized that it always showing larger numbers on dash than actual speed. Now when I go 74, it shows 74. So bigger tires lead to more precise speed readings

 

[jdk24]

OK, I did it!
Michelin Pilot 4 All Season, 265/40/R21 in the front, 295/35/R21 in the rear.
Before digging into this, I never noticed how much side walls on rear tires bigger then in the front Now front and tires are exactly same size from the side, and wide stance from the rear looks great. These tires don't have foam inside like stock tires, so they are slighly louder, but way softer on the highway, you feel less bumps.

Regarding TMPS - I went from 42 PSI on stock tires to 38 PSI on these ones. There are no TPMS warnings.
Regarding speedometer - I checked before, going 72 mph on the straight highway with a certified GPS speedometer, Tesla was showing 74 on the dash. I realized that it always showing larger numbers on dash than actual speed. Now when I go 74, it shows 74. So bigger tires lead to more precise speed readings

View attachment 729398

In regards to the speedometer, are you saying it auto adjusted the speed or are you saying with the stock tires the speedometer was off and now it's accurate?

 

[Quorky]

OK, I did it!
Michelin Pilot 4 All Season, 265/40/R21 in the front, 295/35/R21 in the rear.
Before digging into this, I never noticed how much side walls on rear tires bigger then in the front Now front and tires are exactly same size from the side, and wide stance from the rear looks great. These tires don't have foam inside like stock tires, so they are slighly louder, but way softer on the highway, you feel less bumps.

Regarding TMPS - I went from 42 PSI on stock tires to 38 PSI on these ones. There are no TPMS warnings.
Regarding speedometer - I checked before, going 72 mph on the straight highway with a certified GPS speedometer, Tesla was showing 74 on the dash. I realized that it always showing larger numbers on dash than actual speed. Now when I go 74, it shows 74. So bigger tires lead to more precise speed readings

View attachment 729398

Looks awesome. If you can post some more rear shots and check clearances, so others can see who are interested in the 295 setup vs the 285 that I and others have went with.

 

[Quorky]

In regards to the speedometer, are you saying it auto adjusted the speed or are you saying with the stock tires the speedometer was off and now it's accurate?

He is saying the latter, not the former. Tesla does NOT auto adjust the speedometer. Apparently, with these tires, the speedometer is closer to true, where it was off with original tires.

I wonder if this is an isolated case. Mine is off by the approximate amount that is forecasted with the radial differences.

 

[Leenlow]

Ok I've been researching here and on fb for hours and cant make up my mind on which size tires to buy since my MYP will be arriving next month. Can someone please explain the pros/cons of the front 265/40 & rear 285/40 vs the 275/35 or 265/40 fronts with the 295/35(rear)? We are a bigger couple and I don't want any issues with our heavy loads

 

[BrianMYP]

Did anyone end up trying the 295/40 R21 rears on an MYP? The 35s and the 285s are on backorder at TireRack, so I'm hoping to go with front 265/40 (sure of this) and rear 295/40 (not sure of this).

 

[DarthStar]

He is saying the latter, not the former. Tesla does NOT auto adjust the speedometer. Apparently, with these tires, the speedometer is closer to true, where it was off with original tires.

I wonder if this is an isolated case. Mine is off by the approximate amount that is forecasted with the radial differences.

My speedo was off by +1mph with the p-zeroes. No it is -2mph with the 265/285/40 set up.

 

[Jaspreet]

Did anyone end up trying the 295/40 R21 rears on an MYP? The 35s and the 285s are on backorder at TireRack, so I'm hoping to go with front 265/40 (sure of this) and rear 295/40 (not sure of this).

Can someone with the 295/35/21 take some more detailed pictures to see if there is any clearance issues to put a 295/40/21 tire on the rear.. just my only concern is the wheel well lip or any brackets on the side part that could rub.

 

[Quorky]

My speedo was off by +1mph with the p-zeroes. No it is -2mph with the 265/285/40 set up.

What's a good way to verify? Are the regular apps that track speedo based off GPS reliable? How precise are they?

 

[DarthStar]

What's a good way to verify? Are the regular apps that track speedo based off GPS reliable? How precise are they?

I used Waze, which uses GPS. I've found it to be fairly reliable with my other vehicles, but I can't vouch for it's +/- precision.

 

[Quorky]

I used Waze, which uses GPS. I've found it to be fairly reliable with my other vehicles, but I can't vouch for it's +/- precision.

Ok thanks. That's what I have used and continue to use for close enough estimate.

 

[DarthStar]

Ok thanks. That's what I have used and continue to use for close enough estimate.

Also checked against the radar "your speed" signs on the 5 in San Diego. Same result.

 

[KirillK]

I've got a call from Discount Tire this morning saying "Sorry man, we've put the wrong tires on your Tesla last week". So I wrote that I've put 265/40/R21 in the front, but I never actually checked the numbers on the sidewall myself So I ended up to 265/35/R21 in the front and 295/35/R21 in the rear.

Discount Tire offered me to return back so they can put 265/40/R21 instead, but I decided to keep the current setup because:
1. I'm pretty sure that 265/40/R21 will rub the wheel liner, the clearance will be too small (if any). There is no way to fix that with a heat gun - the liner doesn't flex, it is adjacent to metal elements of the body beneath it.
2. I like that speedometer is 100% accurate with 265/35/R21, comparing so stock 255/35/R21 whish was showing slighly higher numbers than actual speed.
3. Michelin Pilot 4 All Seasons in 265/35/R21 are very comfortable comparing to stock Pirellis and still protect the rim from curb rash. I don't think that extra sidewall of 265/40/R21 worth sacrificing two items above.

 

[BrianMYP]

@KirillK Thanks for sharing that info - I am going to go with the same config.

 

[Sixth]

Hey Quorky, I can’t believe this thread is still alive! So, I finally wore out my oem uberturbine rears.

265/40/21
285/40/21

Here is the thing though, I have a 2020 long range Y with Uberturbines. No rubbing at full lock

I used Atturo tires from my local American tire depot. $800 mounted and balanced. They are dead quiet at highway speeds. Even quieter then my 19” Continentals.

 

[Sixth]

Ok I've been researching here and on fb for hours and cant make up my mind on which size tires to buy since my MYP will be arriving next month. Can someone please explain the pros/cons of the front 265/40 & rear 285/40 vs the 275/35 or 265/40 fronts with the 295/35(rear)? We are a bigger couple and I don't want any issues with our heavy loads

More effective sidewall and wheel protection by going with a wider and taller tire. 285/40/21 for the rear increases the rolling diameter to 30” vs 28.6“ for the rear. Fronts to 28” to 29.3”. You’re also effectively letting the tire flex more since the tires are not stretched over the wheels.

 

[Jaspreet]

Hey Quorky, I can’t believe this thread is still alive! So, I finally wore out my oem uberturbine rears.

265/40/21
285/40/21

Here is the thing though, I have a 2020 long range Y with Uberturbines. No rubbing at full lock

I used Atturo tires from my local American tire depot. $800 mounted and balanced. They are dead quiet at highway speeds. Even quieter then my 19” Continentals.

Is there enough room and clearance in the rears for a 295/40 R21???

 

[mmatlock]

After hearing from others that these sizes are backordered at TireRack, DiscountTire, 1010 etc, I found and ordered the below from Walmart.com today to mount on the OEM 21" Uberturbines:

Front Michelin Pilot Sport AS 4 265/40/21, Manu model 43550
Rear Michelin Pilot Sport AS 4 285/40/21, Manu model 19360

I don't like the way Walmart.com listed the 265/40R21 product name without the XL rating but cross-referencing the model number (43550) they list, 1010 has it listed correctly as the 265/40ZR21 XL.

The 285 size sounds like it's been the hard one to find but somehow, Walmart has it on sale for $150 off per tire. That plus free shipping and a 90 day return policy seemed like a no-brainer.

[update: sounds like there might also be a Michelin $70 rebate? Save with the 2021 Michelin Winter Tire Sale | Michelin]

I guess I'll just stack them in my garage and haul them to KC on MYP pickup day and find a tire shop there to swap them onto the Ubers.

Thank you to @Quorky, @Maximus2002, @MJP.P3D- and all the others who diligently documented this setup, I think it's going to be a massive improvement over stock and will alleviate a lot of anxiety about potentially being forced to drive from KC to OKC in Dec/Jan on summer Pirellis.

 

[norcalbowler94]

so

After hearing from others that these sizes are backordered at TireRack, DiscountTire, 1010 etc, I found and ordered the below from Walmart.com today to mount on the OEM 21" Uberturbines:

Front Michelin Pilot Sport AS 4 265/40/21, Manu model 43550
Rear Michelin Pilot Sport AS 4 285/40/21, Manu model 19360

I don't like the way Walmart.com listed the 265/40R21 product name without the XL rating but cross-referencing the model number (43550) they list, 1010 has it listed correctly as the 265/40ZR21 XL.

The 285 size sounds like it's been the hard one to find but somehow, Walmart has it on sale for $150 off per tire. That plus free shipping and a 90 day return policy seemed like a no-brainer.

[update: sounds like there might also be a Michelin $70 rebate? Save with the 2021 Michelin Winter Tire Sale | Michelin]

I guess I'll just stack them in my garage and haul them to KC on MYP pickup day and find a tire shop there to swap them onto the Ubers.

Thank you to @Quorky, @Maximus2002, @MJP.P3D- and all the others who diligently documented this setup, I think it's going to be a massive improvement over stock and will alleviate a lot of anxiety about potentially being forced to drive from KC to OKC in Dec/Jan on summer Pirellis.

View attachment 734085

Sold out of the front tires..

Edit: Hmmm- maybe I was on the wrong size since they are not sold out now

Are you keeping the tires or will try to sell them? I was wondering if I did the same what would I do with the oem tires.

 

[mmatlock]

so

Sold out of the front tires..

Edit: Hmmm- maybe I was on the wrong size since they are not sold out now

Are you keeping the tires or will try to sell them? I was wondering if I did the same what would I do with the oem tires.

Ah, good news, better snag them.

I'm hoping to try to sell the Pirelli's. Not sure I can get much for them unless I can find someone in TX that wants to come pick them up. I'd guess shipping costs are prohibitive.