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BMW 3-Series (E90 E92) Forum > E90 / E92 / E93 3-series Technical Forums > All-Wheel-Drive (Xi / xDrive) Talk > XI tire size - room for error?



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      09-17-2008, 09:58 PM   #1
Save Bluth
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XI tire size - room for error?

I'm a new owner of an XI coupe. Browsing this forum, I seem to recall a discussion about staying dead on the overall wheel/tire size for the XI. I am generally aware that a car (speedo) is calibrated to the wheel/tire size. But, is there a reason that the XI would be more sensitive to this?

Here's why I ask: I have the stock 17's and am looking to go to 18's. I'm not a huge fan of super thin/low profile rubber. I've seen pictures of cars that have a different look - a more "bulbous" tire, if that makes sense. Obviously, I'm not talking about SUV size - hopefully someone will know what I'm talking about. I'll try to find a picture a post a link.

It just seems like I'd have to go to a larger overall diameter to get the look I want with an 18. Thoughts? Thanks.
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      09-18-2008, 02:05 PM   #2
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The difference in the diameter F-R needs to be close for the X-drive to properly control the wheels. You should search the wheel/tire forums for details. Posting there will probably get a better response.
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      09-18-2008, 02:08 PM   #3
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ive used 235/35/19 front and 265/30/19 rear for 10,000 miles with no issue.

i'm also currently using 245/40/18 front and 275/35/18 rear with no issues.
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      09-18-2008, 03:05 PM   #4
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i'm running 235/35/19's all around to be safe...many people have no problems going staggered but i rather not take a chance on a $40K car...i wouldn've give a shit if it was my old car lol
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      09-19-2008, 10:05 PM   #5
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Quote:
Originally Posted by phozenstone View Post
i'm running 235/35/19's all around to be safe...
same here, running 235/35/19's all around, but i'm thinking next set i'm going to go with 245/40/19s...
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      09-20-2008, 12:39 AM   #6
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Quote:
Originally Posted by uhaulball View Post
ive used 235/35/19 front and 265/30/19 rear for 10,000 miles with no issue.
me 2


use this tool and it'll help you a lot... i hear youre not supposed to go over a 2% difference either up or down.

http://www.1010tires.com/TireSizeCalculator.asp
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      09-20-2008, 02:24 AM   #7
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Quote:
Originally Posted by Save Bluth View Post
staying dead on the overall wheel/tire size for the XI. I am generally aware that a car (speedo) is calibrated to the wheel/tire size. But, is there a reason that the XI would be more sensitive to this?.
This isn't just for a Xi BMW. it is for all AWD cars. you must stay within the same circumference/rotating diameter so the differentials do not suffer premature wear and failure.

The spec is different for each manufacturer. For Subaru (one of the tighter specs I believe) all four tires have to be within 2/32" circumference

IMHO, it is safest to use the OE size. If you want to switch size, stick to the same size for all (ie don't stagger) and also use the same brand for all tires. The reason for this is that tires of different brand may have different physical dimensions even if they have the same stated size, or a mathematically equivalent size
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      09-20-2008, 11:21 AM   #8
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Quote:
Originally Posted by Nick Nazareno View Post
This isn't just for a Xi BMW. it is for all AWD cars. you must stay within the same circumference/rotating diameter so the differentials do not suffer premature wear and failure.

The spec is different for each manufacturer. For Subaru (one of the tighter specs I believe) all four tires have to be within 2/32" circumference

IMHO, it is safest to use the OE size. If you want to switch size, stick to the same size for all (ie don't stagger) and also use the same brand for all tires. The reason for this is that tires of different brand may have different physical dimensions even if they have the same stated size, or a mathematically equivalent size
staggering has nothing to do with it...

if it did do you think BMW would sell xi's with ZSP wheels?
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      09-21-2008, 03:04 PM   #9
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XI tire size

I'm running 245 35 19's at all 4 corners with H&R coilovers with a significant drop. I have had no issues the past six months since the install.
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      09-21-2008, 06:34 PM   #10
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Quote:
Originally Posted by Nick Nazareno View Post
This isn't just for a Xi BMW. it is for all AWD cars. you must stay within the same circumference/rotating diameter so the differentials do not suffer premature wear and failure.
This is wrong, as I've told you before. It varies from manufacturer to manufacturer, depending on the AWD system used.
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      09-21-2008, 09:19 PM   #11
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Quote:
Originally Posted by Lassaxi View Post
This is wrong, as I've told you before. It varies from manufacturer to manufacturer, depending on the AWD system used.
exactly... like i said. if it made a difference, bmw wouldn't stagger the zsp wheel set up on xi's
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      09-21-2008, 09:49 PM   #12
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The only key thing that all AWD systems require are matching the outside diameter between front and rear wheels unless that system is calibrated for different diamters. Staggering affects only the width which has nothing to do with the how the differentials and or clutch systems work. Porsche & BMW AWD systems come from the factory with staggered sets. The key is closely matching the outside diamter only. My porsche has 225/45/17 front and 255/40/17 rear. My 335Xi has 235/35/19 front and 275/30/19 rear. Both sets are near identical in outside diameter.
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      09-22-2008, 12:55 AM   #13
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Quote:
exactly... like i said. if it made a difference, bmw wouldn't stagger the zsp wheel set up on xi's
stagger is fine if the overall diameters are the same. 225/45/17 and 255/40/17 is an example of stagger that maintains the overall diameter. some of the staggers people discuss do not have matching overall diameter

Quote:
Originally Posted by Lassaxi View Post
This is wrong, as I've told you before. It varies from manufacturer to manufacturer, depending on the AWD system used.
Yes, I recall you posting that but I never saw the tech to back up your claim that E90 AWD doesn't require matched overall diameter of the tires.
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      10-06-2008, 01:54 PM   #14
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Why would anyone want to stagger their tires with an AWD setup unless they want to purposely, degrade the driving quality of their BMW????

Stupid.
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      10-06-2008, 03:23 PM   #15
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umm bmw staggers it on the zzp package for the 335xi so i dont get your point
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      10-06-2008, 04:41 PM   #16
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wtf, BMW staggers all their M cars. Are we all on the same page here.

Stagger will still help an AWD car. But it also depends how the car is setup, ie tending to understeer of oversteer
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      10-06-2008, 09:18 PM   #17
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Quote:
Originally Posted by FastLane View Post
Why would anyone want to stagger their tires with an AWD setup unless they want to purposely, degrade the driving quality of their BMW????

Stupid.
It didn't degrade mine and it is the way BMW delivers the car with the sports package.
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      10-06-2008, 09:20 PM   #18
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Quote:
Originally Posted by Lassaxi View Post
This is wrong, as I've told you before. It varies from manufacturer to manufacturer, depending on the AWD system used.
I don't know of any AWD car that doesn't do this. Which one's are you referring to? Porsche as an example matches rotating diameter - at least mine does.
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      10-07-2008, 03:01 PM   #19
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Quote:
Originally Posted by Nikolas View Post
The only key thing that all AWD systems require are matching the outside diameter between front and rear wheels unless that system is calibrated for different diamters. Staggering affects only the width which has nothing to do with the how the differentials and or clutch systems work. Porsche & BMW AWD systems come from the factory with staggered sets. The key is closely matching the outside diamter only. My porsche has 225/45/17 front and 255/40/17 rear. My 335Xi has 235/35/19 front and 275/30/19 rear. Both sets are near identical in outside diameter.
I have a e90 335xi.

I am thinking about getting a set of rims and tires with that same configuration .

What rims do you have? What are your offsets?

Any clearance / rubbing issues?

Thanks
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      10-07-2008, 04:29 PM   #20
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I have Miro M6 et 35 rear & 33 front. They fit fine with no rubbing.
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      10-08-2008, 12:36 PM   #21
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Quote:
Originally Posted by Nikolas View Post
I have Miro M6 et 35 rear & 33 front. They fit fine with no rubbing.
Thanks for the response.

Are you sure it is not et 33 rear and 35 front. This seems to be the most popular offset.

I assume you also have the sedan? I heard that some coupes were having rubbing issues with 275 and 33 offset in the back.

Last edited by neejkoob; 10-08-2008 at 02:54 PM.
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      10-08-2008, 01:00 PM   #22
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Don't run a staggered set in an Xi unless you can make the F/R tire circumference within 1% of each other. Failing that you risk burning out your transfer case clutch pack becasue of the F/R axle speed difference.

See this one:

http://www.e90post.com/forums/showth...42#post3248942

Also see this one, pay attention to posting #20 and 22:

http://www.e90post.com/forums/showth...t=differential
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