BMW Garage BMW Meets Register Search Today's Posts Mark Forums Read
M2 Technical Topics > Wheels / Tires -- Sponsored by The Tire Rack > Increasing tire size from 245/265 to 255/275: any cons ?

Post Reply
 
Thread Tools Search this Thread
      01-07-2017, 04:01 PM   #23
ashburyn54
Captain
ashburyn54's Avatar
599
Rep
810
Posts

Drives: f87 M2
Join Date: Jun 2014
Location: dayton

iTrader: (0)

Quote:
Originally Posted by Pyrat 2 View Post
Quote:
Originally Posted by ashburyn54 View Post
-3 camber up front? If that's the case you can run a 275/30, a 265 won't be an issue. Suspension is H&R sports. 12mm spacers up front and 7mm out back on stock wheels. No camber plates yet so stock camber. Tire brand is Bridgestone, they are winters so the tread adds some height I assume.

When I have my wheels built it'll be close to those specs. 19x10 square et 32-36, haven't decided yet but I'll be running them with the spacers since they won't have centercaps, the turner hub-extenders hide the hub rust when running Open lug racing wheels.

So final specs with spacers will be right around 19x10 et 22-25 front and et 28 rear. I still have a little room out back with this setup and camber plates up front would give me 5mm or so of extra wiggle room.
Thanks! Helpful.
Wanting 265/35 instead of 275/30 because I'm looking for some extra rubber between the ground and the wheel. My concern has been rubbing with the fender liner in front near the inlet duct. Clearance is very tight even with the stock wheels when they are turned and I want to make sure that the larger diameter doesn't rub there. I'm not concerned about inner rub with the strut or outer rub with the fender (because of my camber).
I too will be going with the Turner extenders. My wheel on order are 35 offset and was looking at either the 7.5 to 10mm extenders giving me a 27.5 or 25 offset. My rear offset will be 35 with a 265 or 275/35-19 tire.
Yeah you may get a little, very minor rub on the front liner with the 35. It's so close I'm sure it would come down to tire brands and sizing. I have to be at full lock on winter 265/35's to rub just a hair, I have to try to hear it and it hasn't worn through the plastic at all. If I wasn't running a spacer it wouldn't rub the front liner at all. Those specs with a spacer are 19x9 265/35r19 et19. So with a 10" wheel it will be very close.

You should be well clear of the outside fender, the next and biggest concern would be the strut. I believe Active Auto's build had BC racing 18x10 et 35 square with a 275/35. In order for them to clear the strut with camber plates they used a 12mm spacer up front and the rear was fine. I believe they ran 2.3-2.5 degrees up front

I'm thinking anything in the 10" et 22-24 region is going to be perfect. The higher that offset the lower the chance you have of rubbing the front duct but you'll have a higher chance of running into strut issues. We probably have a 2-5mm margin for error running 19's with a 35 series sidewall.
Appreciate 1
Pyrat 21244.00

      03-04-2017, 09:08 AM   #24
Bmwbb
Private First Class
24
Rep
103
Posts

Drives: M2
Join Date: May 2016
Location: Hong Kong

iTrader: (0)

Just wondering will 255/35/19 and 285/35/19 fit the 437m wheel?
Appreciate 0
      03-04-2017, 12:02 PM   #25
SupraSaiyan
Private First Class
40
Rep
137
Posts

Drives: 2008 M3 6MT Stripper AW/Black
Join Date: Mar 2016
Location: Vancouver

iTrader: (0)

Quote:
Originally Posted by Bmwbb View Post
Just wondering will 255/35/19 and 285/35/19 fit the 437m wheel?
Yes they will fit the 437M wheels. I would even go 265 up front. However depending on your suspension setup, you could rub on the rear.
Appreciate 0
      02-20-2018, 04:04 AM   #26
pmilani
Private
pmilani's Avatar
Italy
38
Rep
52
Posts

Drives: M3 CS (LRG)
Join Date: Jun 2016
Location: Italy

iTrader: (0)

Garage List
2018 BMW M3 CS  [0.00]
Increasing tire size from 245/265 to 2552/275: any cons ?

hi, I wanna switch from stock to Michelin Pilot Sport Cup 2 for the warm season.
Can I fit a 255/35+275/35 (all 19") set? any issues to be aware of?
AFAICS that size is still within the ideal range for the stock 437M wheel sizes: https://tiresize.com/tires/Michelin/...port-Cup-2.htm
Appreciate 0
      02-20-2018, 06:26 AM   #27
Deutsches Blut
Private First Class
Canada
82
Rep
138
Posts

Drives: 2012 335i E92 M Sport / 2008 C
Join Date: Jun 2016
Location: Kitchener

iTrader: (0)

Quote:
Originally Posted by pmilani View Post
hi, I wanna switch from stock to Michelin Pilot Sport Cup 2 for the warm season.
Can I fit a 255/35+275/35 (all 19") set? any issues to be aware of?
AFAICS that size is still within the ideal range for the stock 437M wheel sizes: https://tiresize.com/tires/Michelin/...port-Cup-2.htm
I run those sizes with no issues. Stock suspension.
Appreciate 7
pmilani38.00
M2Tom1.50
mikeahso397.00
Robin_NL5069.50

      02-20-2018, 12:27 PM   #28
MagnusT
Lieutenant
MagnusT's Avatar
Sweden
353
Rep
508
Posts

Drives: BMW M2
Join Date: Jun 2016
Location: Stockholm

iTrader: (0)

Ran those sizes without any problems too.
Appreciate 2
pmilani38.00

      02-23-2018, 07:50 PM   #29
M-Supra
First Lieutenant
M-Supra's Avatar
375
Rep
332
Posts

Drives: 2018 M2, 2JZ-M5
Join Date: Mar 2010
Location: Atlanta

iTrader: (0)

Quote:
Originally Posted by pmilani View Post
hi, I wanna switch from stock to Michelin Pilot Sport Cup 2 for the warm season.
Can I fit a 255/35+275/35 (all 19") set? any issues to be aware of?
AFAICS that size is still within the ideal range for the stock 437M wheel sizes: https://tiresize.com/tires/Michelin/...port-Cup-2.htm
Go with 275/30-19 and 295/30-19 MPS 4S or Kumho PS91 if you want her to stick and rubber to last a bit longer.
Attached Images
 

Last edited by M-Supra; 02-23-2018 at 08:01 PM..
Appreciate 0
      02-28-2018, 03:23 PM   #30
gsrbri
Lieutenant
United_States
454
Rep
485
Posts

Drives: F87 6MT
Join Date: Jul 2011
Location: Boston, MA

iTrader: (0)

Quote:
Originally Posted by pmilani View Post
hi, I wanna switch from stock to Michelin Pilot Sport Cup 2 for the warm season.
Can I fit a 255/35+275/35 (all 19") set? any issues to be aware of?
AFAICS that size is still within the ideal range for the stock 437M wheel sizes: https://tiresize.com/tires/Michelin/...port-Cup-2.htm
That is the stock M4 set up and the 437M wheels are exactly the same.
Appreciate 0
      03-01-2018, 09:48 AM   #31
maliderosF87
Private
36
Rep
76
Posts

Drives: F87
Join Date: Jun 2017
Location: Athens

iTrader: (0)

Would also like to know if upgrading to 255F/275R will negatively affect the car in term's of safety electronics (ESP,ABS etc etc)
Appreciate 0
      03-01-2018, 10:44 AM   #32
pmilani
Private
pmilani's Avatar
Italy
38
Rep
52
Posts

Drives: M3 CS (LRG)
Join Date: Jun 2016
Location: Italy

iTrader: (0)

Garage List
2018 BMW M3 CS  [0.00]
Quote:
Originally Posted by maliderosF87 View Post
Would also like to know if upgrading to 255F/275R will negatively affect the car in term's of safety electronics (ESP,ABS etc etc)
Interesting question, more like I'm curious on how the nannies behavior is programmed. Observing that when I run 245/45/18 during winter, the car sure has a slightly different behavior but nannies still work fine. Especially in comfort mode where the corrective actions kick in early, it doesn't feel different.

Is the nannies response adaptive by nature, such as they just are reacting on sensor inputs and that would be generic enough that it works on any wheel/tire?
Appreciate 0
      03-02-2018, 11:14 AM   #33
alscks0414
Major
alscks0414's Avatar
Canada
616
Rep
1,204
Posts

Drives: MY18 X3 M40i, MY18 M3 ZCP
Join Date: Apr 2017
Location: Toronto

iTrader: (0)

Hey guys,

All vehicles regardless of makes, do develope their electronic measures of cars based on their manufactured spec.

LSD, suspension, engine throttle, and other ECU controlled features will be basically working as "what manufacter intended" when you are keeping all things as state as it came.

Tire sizes will be one of the component as well.
However, remember that a lot of different model vehicles do offer different wheel sizes but they will relatively change their tire sidewall profile so that rolling diameter of vehicle will not differ much. They set about 1 % (or less)of difference of rolling diameter will not alter the driving characteristic of one vehicle and will not give much stress on ECU controls and other physical components. (Same thing goes for AWD, xDrive. If you wish to go with staggered wheels + tires setup front and rear, engineers recommend you to stay within 1 % difference of rolling diameter front and back).

If you do go over this 1 % boundary, you could potentially run into "different driving characteristic from what manufacturer initially intended".
All makes do spend tons of hours to develop their car and when it comes to sports cars that requires precisely measured values and input, they will spend more time for research to decide what they will do before any vehicle released for sale. But, of course, they are not perfect.. resulting recalls and extensive repairs, etc.

Going back to the topic, 245/35/19F + 265/35/19R and 255/35/19F + 275/35/19R does make their different in rolling diameter about 1.07 % front and 1.05 % at the rear. And I would not consider this as "major difference" for ECU control measures and driving dynamics.

Name:  Capture.PNG
Views: 2883
Size:  5.4 KB

Cheers
Appreciate 9
pmilani38.00
Spare°226.00
Altra181.00
ddk632534.50
Artemis12005.00
ried619.00

      03-02-2018, 01:48 PM   #34
pmilani
Private
pmilani's Avatar
Italy
38
Rep
52
Posts

Drives: M3 CS (LRG)
Join Date: Jun 2016
Location: Italy

iTrader: (0)

Garage List
2018 BMW M3 CS  [0.00]
Quote:
Originally Posted by alscks0414 View Post
Going back to the topic, 245/35/19F + 265/35/19R and 255/35/19F + 275/35/19R does make their different in rolling diameter about 1.07 % front and 1.05 % at the rear. And I would not consider this as "major difference" for ECU control measures and driving dynamics.
Great answer and explanation! Appreciated!
Appreciate 0
      03-02-2018, 03:17 PM   #35
M2joey
First Lieutenant
M2joey's Avatar
226
Rep
340
Posts

Drives: M2, 335is , CBR100RR
Join Date: Feb 2017
Location: Ashburn, VA

iTrader: (0)

Quote:
Originally Posted by pmilani View Post
Interesting question, more like I'm curious on how the nannies behavior is programmed. Observing that when I run 245/45/18 during winter, the car sure has a slightly different behavior but nannies still work fine. Especially in comfort mode where the corrective actions kick in early, it doesn't feel different.

Is the nannies response adaptive by nature, such as they just are reacting on sensor inputs and that would be generic enough that it works on any wheel/tire?
I have run a number of sizes on the track in 2017, in all conditions, and lots of skid pad time. I can at least say I have not experiences any issues. Then again, I also run DSC completely off. Pretty sure it is a non-issue aside from seeing the most accurate MPH, distance, etc.
Appreciate 0
      03-02-2018, 07:39 PM   #36
F87_LCI
Lieutenant Colonel
F87_LCI's Avatar
1741
Rep
1,729
Posts

Drives: 2018 LBB F87
Join Date: Mar 2007
Location: North

iTrader: (1)

Quote:
Originally Posted by alscks0414 View Post
Going back to the topic, 245/35/19F + 265/35/19R and 255/35/19F + 275/35/19R does make their different in rolling diameter about 1.07 % front and 1.05 % at the rear. And I would not consider this as "major difference" for ECU control measures and driving dynamics.

Attachment 1778804

Cheers
Any chance you feel like running the same analysis for 265/35/19 front, 285/30/19 rear??
Appreciate 0
      03-02-2018, 08:17 PM   #37
alscks0414
Major
alscks0414's Avatar
Canada
616
Rep
1,204
Posts

Drives: MY18 X3 M40i, MY18 M3 ZCP
Join Date: Apr 2017
Location: Toronto

iTrader: (0)

Sorry i dont have access to my computer right now. I am at my shop.

I did make some hand writing (sorry my writingis pretty bad) for the same analysis requested.

So the difference is 2.22 % between the stock rear roiling diameter to ur intended size spec.

But please be aware this calculation only to measure how u will be close to the setting from the manufacturer. Does not mean that u will not enjoy different setting with different tire sizes.

Some engineer could argue that 1 % difference is too small to judge the boundary to calculate whether it will give stress to the electronic and mechanical features controlling vehicle driving dynamics.
Attached Images
  
Appreciate 2
pz6192319.50
Spare°226.00

      03-07-2018, 09:20 AM   #38
MagnusT
Lieutenant
MagnusT's Avatar
Sweden
353
Rep
508
Posts

Drives: BMW M2
Join Date: Jun 2016
Location: Stockholm

iTrader: (0)

I did some calculations/comparisons of balance between front and rear diameters on stock wheels and BMWs own winter wheel setups. The original BMW winter wheels come in two variants, staggered and non staggered. Both with considerably smaller rolling diameters than the stock wheels. And considerable differences in balance front / rear diameters with staggered and non staggered.

So what I got out of my calculations was that the electronic systems in the M2, according to BMW themselves, can handle quite large changes. And how large these changes were okay to be.
Appreciate 1
      03-08-2018, 07:16 PM   #39
alscks0414
Major
alscks0414's Avatar
Canada
616
Rep
1,204
Posts

Drives: MY18 X3 M40i, MY18 M3 ZCP
Join Date: Apr 2017
Location: Toronto

iTrader: (0)

Quote:
Originally Posted by MagnusT View Post
I did some calculations/comparisons of balance between front and rear diameters on stock wheels and BMWs own winter wheel setups. The original BMW winter wheels come in two variants, staggered and non staggered. Both with considerably smaller rolling diameters than the stock wheels. And considerable differences in balance front / rear diameters with staggered and non staggered.

So what I got out of my calculations was that the electronic systems in the M2, according to BMW themselves, can handle quite large changes. And how large these changes were okay to be.
Wheel and tire sizes and driving will come to pretty much personal preference.

However, LSD and transfer case for AWD vehicles will suffer mechanically if change is significant.
Appreciate 0
      03-09-2018, 07:27 AM   #40
The Prodigy
Private
40
Rep
63
Posts

Drives: M2
Join Date: Jan 2016
Location: Germany

iTrader: (0)

Can I run those sizes on the 437m wheel AND 10mm spacers on each wheel?
Appreciate 0
      03-09-2018, 01:47 PM   #41
Mpower113
Enlisted Member
48
Rep
45
Posts

Drives: 16' M2
Join Date: Apr 2016
Location: LA

iTrader: (0)

Apologies for bringing up and old thread. Didn't want to start a new one as this has been discussed extensively.

Anyone here running 255 front 275 here on stock suspension? If so, any noticeable changes or handling dynamics? Any rubbing issues? Dis you prefer the stock wheel sizing? Trying to get as much info before i size up.
Appreciate 1
      03-12-2018, 04:53 AM   #42
Doji desu
Private
79
Rep
60
Posts

Drives: LBB M2 DCT w/- sunroof
Join Date: Mar 2016
Location: Australia

iTrader: (0)

Just fitted PS4S in 255/275 on stock wheels with stock suspension. No rub or any detrimental effects which is what others have mentioned. I guarantee the green Michelins have more grip than the Contis they replaced which were still very legal. Good riddance to bad rubbish as my Gran would say!

Edit: I bought the tyres online and one of the approved fitting stations was a local BMW dealer though not the one I bought the car from. When I picked up the car the service rep said you do know these are bigger than standard and I said yes, I ordered them that size. No other comment.

The invoice has written:

"TYRES FITTED TO VEHICLE LARGER THAN ORIGINALLY EQUIPPED. ****** BMW CANNOT BE HELD LIABLE FOR ANY DEVIATIONS IN DISPLAYED SPEED, ABS, OR DSC OPERATION."

Arse covering much. Wonder what they would have done if I went 275/30 and 295/30 as others on here have done?

Last edited by Doji desu; 03-12-2018 at 06:09 PM..
Appreciate 0
      03-23-2018, 01:44 PM   #43
bimmer4life24
Lieutenant
bimmer4life24's Avatar
United_States
231
Rep
534
Posts

Drives: 2018 M2
Join Date: Jan 2010
Location: Chicago

iTrader: (1)

OP did you make a decision on what tire sizes you will be going with? I'm also debating OEM sizes vs 255-275. Interested to know the better option.
Appreciate 0
      03-23-2018, 01:51 PM   #44
alscks0414
Major
alscks0414's Avatar
Canada
616
Rep
1,204
Posts

Drives: MY18 X3 M40i, MY18 M3 ZCP
Join Date: Apr 2017
Location: Toronto

iTrader: (0)

Quote:
Originally Posted by bimmer4life24 View Post
OP did you make a decision on what tire sizes you will be going with? I'm also debating OEM sizes vs 255-275. Interested to know the better option.
I went with 255/275 but not on OE 437M but HRE FF04.
Will be fitting them on next Sat with Ohlins R&T and GC Camberplates.
Appreciate 1
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 01:15 AM.




m2
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