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E90/E91/E92/E93 (2006 - 2013)
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  #1  
Old 07-24-2014, 02:23 PM
portum89 portum89 is offline
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Quick Wheel help!!! Newbie to BMW's

I currently have a 2006 325xi, i came across a set of wheels on craigslist of a set of 162's for sale for $350. The wheel dimensions are "225/45R18 and the rear tires are 255/40R18'" would that work on my car? I just bought it, it has warranty on it. I understand that AWD systems work mostly on equal tires. I've done research and found some people running this setup, infact the guy selling them has a 08 328xi. Any help is useful, pardon my ignorance if it is much of a newbie question, but i got tired of looking on forums and not finding an exact answer. Thanks!
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  #2  
Old 07-24-2014, 02:27 PM
portum89 portum89 is offline
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Forgot to mention it comes with Blizzak winter tires on 3 of them, 1 got a hole on the sidewall.
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Old 07-24-2014, 02:35 PM
Porando Porando is offline
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2006 325xi with sport suspension uses staggered setup: 225/45-17 (F) and 255/40-17 (R).. To use 18" wheels tires would have to be 225/40-18 (F) and 255/35-18 (R)
If you have 225/45R18 and the rear tires are 255/40R18 - they are not correct.
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Old 07-24-2014, 02:44 PM
portum89 portum89 is offline
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Quote:
Originally Posted by Porando View Post
2006 325xi with sport suspension uses staggered setup: 225/45-17 (F) and 255/40-17 (R).. To use 18" wheels tires would have to be 225/40-18 (F) and 255/35-18 (R)
If you have 225/45R18 and the rear tires are 255/40R18 - they are not correct.
Thanks for the reply! I get it, It is standard suspension, not sport suspension. So im assuming they would not work they way they are. Perhaps they would, but possibly mess up my AWD system.
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Old 07-24-2014, 03:06 PM
fdriller9 fdriller9 is offline
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As long as the rolling diameters of the front and rear are within 1% of each other, it's fine.

There are many tire calculators available online for free that you can enter the tire seizes and wheel diameter to find the rolling diameter difference.
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Old 07-24-2014, 03:06 PM
fdriller9 fdriller9 is offline
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As long as the rolling diameters of the front and rear are within 1% of each other, it's fine.

There are many tire calculators available online for free that you can enter the tire seizes and wheel diameter to find the rolling diameter difference.
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Old 07-24-2014, 03:12 PM
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Zeichen311 Zeichen311 is offline
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The suspension you have doesn't matter. Porando was actually referring to the tire/wheel sizes fitted with the sport package, which also included the sport suspension. Regardless, as noted, those tires are the wrong size. They might be OK for RWD but you would have to check the exact specifications for the tire model to determine if the combination of sizes was safe for use with AWD.

For xDrive it is important to have the overall diameter (really, the revolutions per mile) of all four tire assemblies within about 1% of each other. The factory-specified staggered fitments assure that. The transfer case can be damaged by the constant strain of accommodating mismatched front & rear tire sizes.


Edit: ... And while I was correcting my phone's typos, fdriller posted the same thing.
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Last edited by Zeichen311; 07-24-2014 at 03:16 PM.
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Old 07-24-2014, 04:04 PM
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tturedraider tturedraider is offline
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Regarding just the wheels, those will fit your car just fine.
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Old 07-24-2014, 04:44 PM
portum89 portum89 is offline
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Yes they will fit, but i would not want any problems with the AWD system really. I am currently searching how to do the diameter calculation to see if it is within 1%. I really like the wheel design on the 162's and would love to rock them, but wouldnt put my xdrive in geopardy for it either.
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Old 07-24-2014, 04:54 PM
portum89 portum89 is offline
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Yeah i got like 4.40% while doing the calculation from stock to the 162's for rolling diameter. Perhaps i should wait for other wheels, or could even find different tires to lower the percentage.
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Old 07-24-2014, 05:38 PM
portum89 portum89 is offline
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Got it figured out! thanks a lot guys! those wheels were coming with a 4.4% difference in rolling diameter. Unless the guys is intersted on selling the rims only, then i would look into buying them, if not, i can just wait for another offer, or save up for a good set that wont affect my Xdrive. Thanks again!
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Old 07-24-2014, 08:13 PM
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Zeichen311 Zeichen311 is offline
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Quote:
Originally Posted by portum89 View Post
Got it figured out! thanks a lot guys! those wheels were coming with a 4.4% difference in rolling diameter. Unless the guys is intersted on selling the rims only, then i would look into buying them, if not, i can just wait for another offer, or save up for a good set that wont affect my Xdrive. Thanks again!
You're talking about a set of Style 162s, with tires, for $350? That's about the price of one brand-new bare wheel. If you want them, buy them and scrap the bloody tires!

As tturedraider said, the wheels are not a problem. Just mount the correct tire sizes and you'll be fine. The 18x8" wheels go on the front with 225/40R18 tires. The 18x8.5" wheels go on the back, with 255/35R18 tires. This is the OE staggered fitment for RWD and AWD cars and will not harm the transfer case.
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  #13  
Old 07-28-2014, 11:00 AM
portum89 portum89 is offline
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quick update, i ended up buying the wheels. I am going to go to my tire shop to get the right wheels on it, hoping i can get in some trade in value for the ones it comes with, and the ones i currently have on the 16's. Thanks again
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