F30POST
F30POST
2012-2015 BMW 3-Series and 4-Series Forum
BMW Garage BMW Meets Register Search Today's Posts Mark Forums Read
BMW 3-Series and 4-Series Forum (F30 / F32) | F30POST > Technical Forums > xDrive All-Wheel Drive Discussions > Xdrive tire sizing question
ARMA SPEED
Post Reply
 
Thread Tools Search this Thread
      05-21-2020, 11:21 PM   #1
Modphoto
First Lieutenant
526
Rep
303
Posts

Drives: 2018 330i M sport wagon
Join Date: Aug 2015
Location: Costa Mesa

iTrader: (1)

Xdrive tire sizing question

So I'm picking up a set of OEM 437m wheels tomorrow and I have a question about tire sizes. Both options are within 1% of each other (front to rear) in overall diameter. What I want to know is does it matter how much taller the tires are then the stock ones. The sizes are listed below so let me know your thoughts. Both options have the same front which is 0.4" taller then the original tire. Option 1 is 0.3" taller and option 2 is 0.6" taller then the original rear. Will that be a problem or is the only controlling factor the front to rear ratio that needs to be within 1%? Which both of these options are.

Current:
Staggered 18" style 398 Orbit Grey wheels
Front 18 x 8 with 225/45/18
Rear 18 x 8.5 with 255/40/18

Option 1:
OEM 437m whels
Front 19 x 9 with 235/40/19
Rear 19 x 10 with 265/35/19
This option is -0.4%

Option 2:
OEM 437m whels
Front 19 x 9 with 235/40/19
Rear 19 x 10 with 275/35/19
This option is +0.8%

Thanks


Last edited by Modphoto; 05-22-2020 at 10:48 AM..
Appreciate 0
      05-22-2020, 01:29 AM   #2
alohasurftoad
Colonel
United_States
1632
Rep
2,877
Posts

Drives: 428i gran coupe
Join Date: Apr 2015
Location: hawaii

iTrader: (0)

option 2 is 0.8% front/rear diameter difference, fine for x-drive. a little more forward rake than option 1 but not much. a lil more understeer due to 40mm front/rear width stagger, but you may not notice or care.

personally, i like option 1. gaps are even, 30mm front/rear width stagger. more balanced appearance.

few have said you need to remain near the oem diameter of 26", however i've seen members run 0.8" over without issue. imo the 1% front/rear diameter difference is all that matters.
Appreciate 0
      05-22-2020, 10:46 AM   #3
Modphoto
First Lieutenant
526
Rep
303
Posts

Drives: 2018 330i M sport wagon
Join Date: Aug 2015
Location: Costa Mesa

iTrader: (1)

Quote:
Originally Posted by alohasurftoad View Post
option 2 is 0.8% front/rear diameter difference, fine for x-drive. a little more forward rake than option 1 but not much. a lil more understeer due to 40mm front/rear width stagger, but you may not notice or care.

personally, i like option 1. gaps are even, 30mm front/rear width stagger. more balanced appearance.

few have said you need to remain near the oem diameter of 26", however i've seen members run 0.8" over without issue. imo the 1% front/rear diameter difference is all that matters.
That's what my understanding as well. Thanks
Appreciate 1
      05-22-2020, 11:04 AM   #4
alohasurftoad
Colonel
United_States
1632
Rep
2,877
Posts

Drives: 428i gran coupe
Join Date: Apr 2015
Location: hawaii

iTrader: (0)

F30 x-drive, stock height,with 235/40-265/35 on OEM 437M.
https://f30.bimmerpost.com/forums/sh...&postcount=181

Best 437M thread. Many with x-drives. Read please read, if you have time.
https://f30.bimmerpost.com/forums/sh....php?t=1020367

option 3: 245/35-285/30, 0.4%, increased gap due to slightly smaller diameters, better if lowered.
https://f30.bimmerpost.com/forums/sh...&postcount=291

option 4: 255/35-265/35, 1%, reduced understeer
https://f30.bimmerpost.com/forums/sh...&postcount=265

Last edited by alohasurftoad; 05-22-2020 at 11:22 AM..
Appreciate 1
Modphoto525.50

      05-23-2020, 11:40 AM   #5
ryanf30
New Member
2
Rep
9
Posts

Drives: BMW 328i XDrive
Join Date: May 2020
Location: Connecticut

iTrader: (0)

recently purchased the 437M wheels for my 2014 BMW 328i XDrive .

The wheels came directly off an M4 with the OEM Specs
255/35/19 19x9 ET 29
275/35/19. 19x10. ET 40

I understand this will not work with the XDrive system so I decided to square the set and bought 2 more 255/35/19 to match the front

My question is, Am I safe with this set up? Not sure how much my offset has changed with moving down the rear size from 275/35/19 down to 255/35/19 . I've noticed my EPS seems to be heavy one second then lighter the next. Is this incompatible with the F30 X-Drive?

Notes-
Stock suspension
Not lowered

Any feedback would be greatly appreciated!
Appreciate 0
      05-23-2020, 08:22 PM   #6
Modphoto
First Lieutenant
526
Rep
303
Posts

Drives: 2018 330i M sport wagon
Join Date: Aug 2015
Location: Costa Mesa

iTrader: (1)

Quote:
Originally Posted by ryanf30 View Post
recently purchased the 437M wheels for my 2014 BMW 328i XDrive .

The wheels came directly off an M4 with the OEM Specs
255/35/19 19x9 ET 29
275/35/19. 19x10. ET 40

I understand this will not work with the XDrive system so I decided to square the set and bought 2 more 255/35/19 to match the front

My question is, Am I safe with this set up? Not sure how much my offset has changed with moving down the rear size from 275/35/19 down to 255/35/19 . I've noticed my EPS seems to be heavy one second then lighter the next. Is this incompatible with the F30 X-Drive?

Notes-
Stock suspension
Not lowered

Any feedback would be greatly appreciated!


The only issue I see is your rear tire will look stretched on a 10" wheel compared to the front. Other then appearance I don't see any issues with your setup.
Appreciate 0
Post Reply

Bookmarks

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 03:10 AM.




f30post
Powered by vBulletin® Version 3.8.11
Copyright ©2000 - 2020, vBulletin Solutions Inc.
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