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BMW 3-Series (E90 E92) Forum > E90 / E92 / E93 3-series Technical Forums > All-Wheel-Drive (Xi / xDrive) Talk > Need Help...with wheels.



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      04-20-2009, 07:36 PM   #1
Julyzon
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Need Help...with wheels.

Sorry, I have read other post on this but I want to make sure.
Will these wheels be ok, or do I have to get new tires. I have a 2008 335xi with 17's.

19x8.5 front, 19x10 back
245/35/19 front, 275/30/19 rear

Thanks in advance.
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      04-20-2009, 08:19 PM   #2
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That tire combo is no good.

The difference in the rotating diameter is at 1%. The maximum difference for an Xi vehicle is 1%.

Running right on the high end of the limit is a risk in my opinion.

The best set of wheels are

235/35/19 Front
275/30/19 Rear

The rotating diameter difference with this set is only 0.1% which is pretty much 0% difference. Much safer.
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      04-20-2009, 08:41 PM   #3
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I am actually running 245/35/19 both front and rear with no problems at all. I din't lower my car though.
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      04-20-2009, 08:44 PM   #4
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Quote:
Originally Posted by IU328xi View Post
I am actually running 245/35/19 both front and rear with no problems at all. I din't lower my car though.
Yea.. you are driving non-staggered which is fine.

However OP is putting a staggered setup on his car which means having a rotating diameter difference between fronts and rears of no more than 1% (high end) is allowed.
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      04-21-2009, 09:00 AM   #5
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depending on offset and suspension setup, 275s may rub in the rear. This is the reason many go with 235/35 up front and 265/30 in the rears
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      04-23-2009, 05:47 AM   #6
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Ok, I am currently using this setup and there is no rub because I am on stock suspension. Im really trying not to buy new tires if not needed. What would be the affects if I continue to use this setup?

Thanks again.
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      04-23-2009, 12:30 PM   #7
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Well with that set up you are at 1.01% differance. since that is right at the maxium limit, you will be putting a little more stress on the transfer case, and might trigger a DSC fault. I would really recommend to get a set of 235/35R19 for the front. Then you will have a .08% difference.
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      04-23-2009, 01:58 PM   #8
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You do have an increase risk of blowing the AWD transfer case.
Keeping the difference below 1% is fine by BMW. I guess the margin of error they set was 1%.
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