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      05-21-2019, 11:39 AM   #1
nvestr
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MIchelin Pilot Sport 4S for the 21" rims - thoughts?

Hi all -

Picking up my M40i this weekend with the 21 inchers and am already planning a tire purchase for when the OEM's start running low. I don't like being restricted to Alenza's and the Pirelli PZero's.

I want to get non-runflats. I am currently looking at Michelin PS4S, which I have had on my C43 AMG and loved!

I have not seen anybody on this forum use them with the 21 inchers so I'm thinking either I missed it or there's a reason I'm missing.

OEM REAR Specs :

275/35R21
Diameter : 28.6"
Width : 10.8"
Wheel : 21" x 9-11"
Sidewall : 3.8"
Circum. : 89.7"
Revs/Mile : 706


The Michelin Pilot Sport 4S is available in this size so easy peasy.

OEM Front Specs :

245/40R21
Diameter : 28.7"
Width : 9.6"
Wheel : 21" x 8-9.5"
Sidewall : 3.9"
Circum. : 90.2"
Revs/Mile : 703


The closest PS4S I can find would be this one :


255/35R21
Diameter : 28.0"
Width : 10.0"
Wheel : 21" x 8.5-10"
Sidewall : 3.5"
Circum. : 88.0"
Revs/Mile : 720


I feel like the 0.7" diameter and 17 rev/mile difference is not huge enough to cause problems or am I mistaken?

Thoughts?
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      05-21-2019, 01:55 PM   #2
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Quote:
Originally Posted by nvestr View Post
I feel like the 0.7" diameter and 17 rev/mile difference is not huge enough to cause problems or am I mistaken?

Thoughts?
That seems fairly large to me. I don't know if X-Drive is still as sensitive as it used to be but I would try to keep the diameters as close as possible.
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      05-21-2019, 02:10 PM   #3
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That would be over a 2% difference so out of tolerance for the xdrive.

I've been waiting for the front to come out in OEM size so I can swap to them too
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      05-21-2019, 04:21 PM   #4
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This question comes up every so often. There is a reason this hasn't been done in the previous 2 years the vehicle has been available. Tire options for 21" are extremely limited, as in maybe 2-3 choices only (and 2 of them are OEM options).

0.7" is too much difference to make the PS4S work.

Also pay attention to load factor.

If you want more options look into 20" rims.
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      05-22-2019, 08:26 AM   #5
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Thanks guys - so is 2% difference the official max oversize you can go in terms of diameter?
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      05-22-2019, 08:33 AM   #6
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How wide are the rear rims? Could one squeeze out a 295/30R21 that would give the rears the same diameter as the fronts suggested above. Slightly off from factory but atleast both axles would have same rolling diameter (isn't that the issue with xDrive)?
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      05-22-2019, 08:41 AM   #7
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I would agree with the previous comment about the Load factor.

Using regular passenger car tires on SUV is not always great.
Need to be XL in load factor and stiffer side walls. Plus super low profiles are difficult to deal with on a SUV.
I would prefer at least 40. and for cars they don't make many 20, 21" with 40 or 45 profiles

Maybe specific light SUV tires?
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      05-22-2019, 08:58 AM   #8
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Quote:
Originally Posted by Ilyam5 View Post
I would agree with the previous comment about the Load factor.

Using regular passenger car tires on SUV is not always great.
Need to be XL in load factor and stiffer side walls. Plus super low profiles are difficult to deal with on a SUV.
I would prefer at least 40. and for cars they don't make many 20, 21" with 40 or 45 profiles

Maybe specific light SUV tires?
The 40 or 45 is not an indicator of absolute sidewall height. It is number that relates to the tire width. Basically on a 295 wide tire, you would multiply 295 by 0.3 (for a 30) to get a sidewall height of 88.5mm. The original tire, you would multiply 275 by .35 to get a sidewall height of 96.5mm... 8mm is not a huge difference but you are right that it would be a lower profile than stock...

Good point on load ratings, I guess I figured that the X3 was very sporty and not overly heavy compared to some big cars that run PS4S from the factory... I guess if you plan on towing stuff it changes things...
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      05-22-2019, 09:01 AM   #9
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I just checked and the PS4S are mostly all XL rated (at least the sizes I am looking at). Also, the MB E63S AMG weighs 4500 lbs and comes with PS4S tires. The M40i weighs 4200 lbs so don't see load being an issue unless you tow...
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      05-22-2019, 09:38 AM   #10
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[QUOTE=nvestr;24817084]
Quote:
Originally Posted by Ilyam5 View Post

Good point on load ratings, I guess I figured that the X3 was very sporty and not overly heavy compared to some big cars that run PS4S from the factory... I guess if you plan on towing stuff it changes things...
If I recall correctly, most tire stores will not sell a tire that does not meet the vehicles load rating requirements- liability issue I surmise. I ran across this issue in the process of buying tires for my E39 sedan at Discount Tires a few years ago.

Last edited by Wgosma; 05-22-2019 at 10:05 AM..
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      05-22-2019, 10:06 AM   #11
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Agreed but I am not sure it does not meet the load rating. OEM Bridgestone Alenza in 275/35R21 has a 103 rating with XL load range and max weight of 1929 lbs. The PS4S in 295/30R21 has a 102 rating with XL load range and max weight of 1874 lbs.

Not sure what the sticker in the door says? If it says 103, then I guess this is problematic...
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      05-22-2019, 10:43 AM   #12
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Quote:
Originally Posted by nvestr View Post
Agreed but I am not sure it does not meet the load rating. OEM Bridgestone Alenza in 275/35R21 has a 103 rating with XL load range and max weight of 1929 lbs. The PS4S in 295/30R21 has a 102 rating with XL load range and max weight of 1874 lbs.

Not sure what the sticker in the door says? If it says 103, then I guess this is problematic...
Quote:
Originally Posted by nvestr View Post
Agreed but I am not sure it does not meet the load rating. OEM Bridgestone Alenza in 275/35R21 has a 103 rating with XL load range and max weight of 1929 lbs. The PS4S in 295/30R21 has a 102 rating with XL load range and max weight of 1874 lbs.

Not sure what the sticker in the door says? If it says 103, then I guess this is problematic...
Maybe contact a tire retailer- they should know, right(?)
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      05-22-2019, 01:11 PM   #13
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Quote:
Originally Posted by Wgosma View Post
Maybe contact a tire retailer- they should know, right(?)
I think they won't install a tire that has less than the load rating indicated on your door jamb... At least that's what I've understood. Can someone tell me what's on the door jamb if it's not too much trouble?
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      05-23-2019, 12:43 AM   #14
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Quote:
Originally Posted by nvestr View Post
Agreed but I am not sure it does not meet the load rating. OEM Bridgestone Alenza in 275/35R21 has a 103 rating with XL load range and max weight of 1929 lbs. The PS4S in 295/30R21 has a 102 rating with XL load range and max weight of 1874 lbs.

Not sure what the sticker in the door says? If it says 103, then I guess this is problematic...
X3M tyre sizes might be the better option, if you can get the tyres (haven't seen them yet).
That's a PS4S in 255/40R21 front and 265/40R21 rear. I think that's a 1% difference but if it's good enough for the X3M then surely it's good enough for us?
(255/45R20 front and 265/45R20 rear on the non-comp X3M)
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      05-23-2019, 09:27 AM   #15
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Quote:
Originally Posted by verysideways View Post
X3M tyre sizes might be the better option, if you can get the tyres (haven't seen them yet).
That's a PS4S in 255/40R21 front and 265/40R21 rear. I think that's a 1% difference but if it's good enough for the X3M then surely it's good enough for us?
(255/45R20 front and 265/45R20 rear on the non-comp X3M)
Interesting! While that makes the fronts wider and the rears narrower than the M40i, it certainly does sound promising.

It looks like those are brand new tire sizes for the PS4S though, as I can't seem to find stock anywhere. I did find them on one website and they showed a price of $590 (Canadian) for one tire, but out of stock. Hopefully that is not what they will really cost lol. Guessing it's because they are so new.

Thanks for this!
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      05-23-2019, 12:02 PM   #16
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Quote:
Originally Posted by Louda0801 View Post
That would be over a 2% difference so out of tolerance for the xdrive.

I've been waiting for the front to come out in OEM size so I can swap to them too
I believe that difference matters when only one axle is changing size, correct?

if you leave the rears the same but reduce the font wheels diameter by 2% the transfer case will see it.

What if all the sizes on all 4 corners are reduced equally.

lets say one goes from
275/45/20 to
275/40/20

1 inch diameter difference but on all 4 corners - theoretically it should not matter.

I did it to my wife's 440xi and winter tires and no issues
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      05-23-2019, 12:12 PM   #17
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Quote:
Originally Posted by Ilyam5 View Post
I believe that difference matters when only one axle is changing size, correct?

if you leave the rears the same but reduce the font wheels diameter by 2% the transfer case will see it.

What if all the sizes on all 4 corners are reduced equally.

lets say one goes from
275/45/20 to
275/40/20

1 inch diameter difference but on all 4 corners - theoretically it should not matter.

I did it to my wife's 440xi and winter tires and no issues
Exactly what I was proposing above (post #6), which would mean using different from stock sizes for both fronts AND rears in the case of the 21's. That being said, waiting for the X3M sizes seems even more interesting.
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      05-23-2019, 03:27 PM   #18
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You cannot exceed 1% difference in overall diameter.
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      05-23-2019, 10:51 PM   #19
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Quote:
Originally Posted by Pray for Mojo View Post
You cannot exceed 1% difference in overall diameter.
From axle to axle. Yes. But not if you change all 4 corners
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      05-24-2019, 02:06 AM   #20
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Quote:
Originally Posted by Ilyam5 View Post
From axle to axle. Yes. But not if you change all 4 corners
You aren't supposed to exceed 1% with xdrive regardless of axle.
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      05-24-2019, 06:05 AM   #21
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Quote:
Originally Posted by Pray for Mojo View Post
You aren't supposed to exceed 1% with xdrive regardless of axle.
Explain to me the mechanics of it. What is the logic?

I see nothing but a speedometer reading effected

Last edited by Ilyam5; 05-24-2019 at 09:13 AM..
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      05-24-2019, 08:31 AM   #22
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My understanding, like Ilyam5, is that your rear diameter cannot be more than 1% different from your front diameter, or vice versa. If you change both equally, it should be fine except for speedo reading. Not all OEM tire configurations on the X3 have the exact same diameter.
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