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XBimmers | BMW X3 Forum BMW X3 and X4 Forums | F25 (2011 - 2017) | F26 (2014 - Current) First Generation BMW X4 (F26) General Forum Help - Larger Tire Diameter & Width over Stock on 20" M40i?

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      01-30-2019, 01:54 PM   #1
geob
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Help - Larger Tire Diameter & Width over Stock on 20" M40i?

Hi Guys,

I am newer to the club with my 2017 X4 M40i.
Photos will come. lol

Anyway I have been searching and researching trying to determine something that hopefully someone can help with.

I currently have stock 20" M40i staggered wheels/tires.
MPSS run flats
245/40ZR20 (stock wheel 20x8.5 ?)
275/35ZR20 (stock wheel 20x10 ?)

I am in Southern NJ and leaning towards getting UHPAS tires as opposed to a whole new set of wheels and tires for winter. If snow is too bad/deep (hasn't happened much lately) I stay home. That's the plan anyway. lol

Trying to decide on M.A/S 3+ vs C.DWS06. Size may be the determining factor.

I think a slightly larger diameter would accomplish a couple desirable things (again it's an M40i).
I would also do a slightly wider front and rear while I am at it.
Then get spacers as/if needed.

- Look better by filling in left/right/height wheel wells better, esp since I'm not wanting to lower or change springs

- Give a slightly more comfortable/softer ride. Yes I know at the expense of aggressive cornering/turning, etc esp with the DWS06. I don't track it, etc so will be fine with that.

So my main questions are:

1 - Any one experience any of the above and care to share comments/feedback on my thoughts about them?

2 - Will going from M.PSS RF to M.A/S 3+ NRF (stock size) be a little softer/comfortable or are they similar?
They are both considered and reviewed as "firm", but not sure how much firmer ones is compared to the other, if at all). Hopefully someone has direct experience.

3 - Anyone know the max diameter for a tires that will fit with stock M40i (not lowered, etc)?

Stock is about 27.6 and other options are about + 1.1 to 1.7

STOCK M.PSS
245/40ZR20 (27.7d x 9.6w)
275/35ZR20 (27.6d x 10.8w)

4 - Anyone know the max width can fit on stock wheels (spacers will be used as needed to push out a little closer to fender regardless)

STOCK WHEELS (I believe):
20x8.5 Front
20x10 Rear

I gather 285 and possibly 295 should be fine.

I am having a hard time finding a slightly taller/diameter and slightly wider (rear fronts have more options) in the C.DWS06 or M.A/S 3+. And seems these 2 are the ones to get, over all the other brands/models as far as I am reading for my area. Nothing is ever easy. lol

Thank you all in advance for you input/advice!!
Geo
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      01-31-2019, 08:01 AM   #2
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How about 275/40/20 front and 305/35/20 rear?
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      02-04-2019, 11:06 PM   #3
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"Will going from M.PSS RF to M.A/S 3+ NRF (stock size) be a little softer/comfortable or are they similar"


Your M.PSS are not RF - they are conventional tires - and very good.

I see very limited clearance around the stock 20"
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      02-07-2019, 11:03 AM   #4
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Thank you for the replies and comments.

I made a mistake as DBU mentioned the 20" staggered Michelin Pilot Super Sports that came on my M40i are not run flats, even though it did not come with a spare. Some how I managed to think the BMW used these as run-flats stock on this setup.

Anyway the main AS tires I am interested in do not offer slightly taller and wider sizes for these wheels. Seems I have to a tougher decision to make. lol

I don't necessarily "need" wider rears, but the stock 275 seems a little stretched on there compared to the stock 245 fronts.
stock 245 on 8.5 inch wheel = 29mm total tire "overhang"
stock 275 on 10 inch wheel = 21mm total tire "overhang"
285 on 10 inch rear wheel = 31mm total tire "overhang" which is much closer to the front (not as stretched).

So far I am leaning towards the M. PS A/S 3+. Which I read should be a little softer then the M.PSS in same size and certainly better for my weather. In the stock size front and a 285 rear.

Thx again!
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      02-11-2019, 10:38 AM   #5
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Call Tire Rack and get their opinion.

My X4 came with staggered 19" Michelin Primacy ZP. The tires have ~12K and with the little snow/ice we had the other week, I slid to a stop 3x on the way home (rain at work, snow/ice close I got to home) and almost wrecked the car. I aways use Michelin but these tires are horrible!

Prior to this, I was considering moving to the PS A/Z3+ that most people like but will talk to TR about using the Premier LTX that I previously ran on my X5. EDIT: Premier LTX not an option for my X4.

I primarily drive the M2 in summer and really need the X4 to be able to do it's thing in winter, even though, like you, I will work from home when it snows.

Last edited by omasou; 02-22-2019 at 09:30 AM..
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      02-17-2019, 11:40 PM   #6
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I would stick with BMW's recommended size option as anything bigger will just be more weight unless you can specifically find accurate test in improvement.
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      02-28-2019, 09:31 AM   #7
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Thanks Guys!

Thanks for all the replies guys.

Appreciate it!

I've learned more and narrowed it down further and more the likely going with these:

Michelin Pilot Sport A/S 3+
245/40 ZR 20 99Y
285/35 ZR 20 100W

Now my problem is whomever did tires last time cranked a lug bolt that is impossible to remove.

Large tire shop spent 30mins on it with all the guys and actually broke a snap-on adapter trying the Extractor with breaker bar.

I'm not looking forward to drilling it out, which I see is the only option. Replacing a hub is a lot cheaper then effing up my wheel.

Thx...
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      03-04-2019, 04:22 PM   #8
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Quote:
Originally Posted by geob View Post
Thanks for all the replies guys.

Appreciate it!

I've learned more and narrowed it down further and more the likely going with these:

Michelin Pilot Sport A/S 3+
245/40 ZR 20 99Y
285/35 ZR 20 100W

Now my problem is whomever did tires last time cranked a lug bolt that is impossible to remove.

Large tire shop spent 30mins on it with all the guys and actually broke a snap-on adapter trying the Extractor with breaker bar.

I'm not looking forward to drilling it out, which I see is the only option. Replacing a hub is a lot cheaper then effing up my wheel.

Thx...
Geo

I'd be concerned that the RPM (Revs per Mile) are different for those two tire sizes. It may mess up your transfer case in the long run if the RPM don't match.
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