BMW X3 Forum
BMW X3 Forum
Welcome to the ultimate BMW X3 community.
BMW Garage BMW Meets Register Search Today's Posts Mark Forums Read
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?

Post Reply
 
Thread Tools Search this Thread
      01-30-2019, 02:54 PM   #1
geob
Registered
0
Rep
2
Posts

Drives: 2017 X4 M40i
Join Date: Jan 2019
Location: Southern New Jersey

iTrader: (0)

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
Appreciate 0
      01-31-2019, 09:01 AM   #2
hardparker
BMX3er
131
Rep
312
Posts

Drives: 2014 X3 M Sport
Join Date: Jan 2017
Location: Albuquerque

iTrader: (1)

Garage List
2013 BMW X1  [0.00]
2014 BMW X3  [0.00]
How about 275/40/20 front and 305/35/20 rear?
__________________
F25 X3 35i M Sport | Pure Stage 2 turbo + inlet | UR de-catted DP | VRSF Race IC | FTP full pipes | BM3 PTF tuned | JB4 stacked | E30 mix | EOS PI | Stage 2 LPFP | WMI | Oil cooler | X5 50i brakes
Appreciate 0
      02-05-2019, 12:06 AM   #3
DBU
Captain
DBU's Avatar
United_States
53
Rep
175
Posts

Drives: 2017 X4 M40i - Clacier Silver
Join Date: Sep 2012
Location: Orange County, California

iTrader: (0)

"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"
__________________
His: '17 X4 M40i - Glacier Silver - fully loaded (except cold weather stuff - not necessary in SoCal -
Hers: '15 X4 2.8i - Glacier Silver - loaded M-Sport
Appreciate 0
      02-07-2019, 12:03 PM   #4
geob
Registered
0
Rep
2
Posts

Drives: 2017 X4 M40i
Join Date: Jan 2019
Location: Southern New Jersey

iTrader: (0)

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!
Geo
Appreciate 0
      02-11-2019, 11:38 AM   #5
omasou
Major
omasou's Avatar
United_States
709
Rep
1,403
Posts

Drives: BMW F87 M2 & F26 X4 M40i
Join Date: Apr 2016
Location: PA

iTrader: (0)

Garage List
2017 BMW M2  [0.00]
2018 BMW X4 M40i  [0.00]
Call Tire Rack and get their opinion.

My X4 came with staggered 19" Michelin Primacy ZP. The tire 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 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; 02-11-2019 at 12:06 PM.
Appreciate 0
      02-18-2019, 12:40 AM   #6
FSociety
2020 X3M/X4M Coming Soon
FSociety's Avatar
No_Country
2849
Rep
6,630
Posts

Drives: X4 M40i / F80 M3 ZCP
Join Date: Apr 2012
Location: NYC NJ CT PA FL

iTrader: (3)

Garage List
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.
__________________
F80 ZCP | bootmod3 | Pending: CTS Turbo DP/CP| Dragy TuneOnly FullTank Times
60-130mph:
F80Paul Stg1+ E85 6.7s | HCP E60 7.3 | HCP E40 7.5 | E30 OTS 7.8s | Stg1 93 8.9s | Stock 11.1

X4 M40i CTSTurbo DP/FMIC BM3 Stg2 93oct 4.1s 0-60 | 12.4@110mph 1/4m
Appreciate 0
Post Reply

Bookmarks

Tags
a/s 3+, a/s3+, as3, diameter, dws06, m40i, pss, tires, wheels, width

Thread Tools Search this Thread
Search this Thread:

Advanced Search

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off


All times are GMT -5. The time now is 07:24 AM.




xbimmers
Powered by vBulletin® Version 3.7.0
Copyright ©2000 - 2019, Jelsoft Enterprises Ltd.
1Addicts.com, BIMMERPOST.com, E90Post.com, F30Post.com, M3Post.com, ZPost.com, 5Post.com, 6Post.com, 7Post.com, XBimmers.com logo and trademark are properties of BIMMERPOST