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3-Series (E46, E90) Chat relating to the BMW 3-Series from 1999 to Current. Models include: BMW 316i, BMW 318i, BMW 318Ci, BMW 320i, BMW 323i, BMW 325i, BMW 330i, BMW 328 Ci, BMW 328i, BMW 325i/xi, BMW 330Ci, BMW 320d, BMW 330d, BMW 335d.

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Old 08-19-2011, 02:41 PM   #1 (permalink)
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Issues with 18'' rims on '04 325i 4DR

Greetings to all,

About 3 years ago I decided to upgrade my OEM rims so I purchased a set of M3 style 18'' rims on EAS and slapped on (4) 235/40 R18 YOKOHAMA AVID W4S XL. The road noice on them was terrible even after the first year but I decided to bite the bullet untill it's time for new ones.

My issue is that I've been doing certain maintenance on my vehicle given it has 100K miles (control arms, engine mounts, transmission mounts) and my mechanic is saying that I should not have gone up to 18" and that I should switch back to 16"/17" and that this is the cause of the recent maintenance I've had to do. So my questions are:

1) Has any body had issues with 18'' on their cars? Is there some modification that needs to be done?

2) What tire size is the best consevative selection? I'm thinking of switching to 225/40 R18 Nexen N3000 ZR

Thanks!
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Old 08-19-2011, 02:46 PM   #2 (permalink)
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Simple... Just maintain the OVERALL diameter of the wheel/tyre combo as of standard !
You may have an offset issue... If the wheels stand out further then you will cause extra wear on the bushes etc... HTH
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Old 08-19-2011, 03:18 PM   #3 (permalink)
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Sorry, but what exactly do you mean by "maintaining the OVERALL diameter of the wheel/tyre combo as of standard"? Thanks!
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Old 08-19-2011, 04:28 PM   #4 (permalink)
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Measure top-to bottom of your standard tyre/wheel combo!! And do not deviate! \\\If you do deviate then this will throw-out the clocks...
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Old 08-19-2011, 06:11 PM   #5 (permalink)
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go big 19inch and leave your worries behind baby! i aint got no issues on either of my rides.
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Old 08-20-2011, 07:22 AM   #6 (permalink)
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Have a look at this site. You want to maintain the rolling diameter of the tyres, so as you go up through the rim & tyre sizes, you need to reduce the profile size, which in turn impacts on the ride quality through reduced tyre wall flex to absorb bumps.
Custom rims, wheel tire packages for your ride - RIMSnTIRES.com
Enter the details of your original tyres and wheels and compare them to the tyres that you are considering. Try and keep the tyre diameter figure as close to original as you can by fiddling around with the width and profile numbers, you want to be within 3 - 5% if possible
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Old 08-20-2011, 09:52 AM   #7 (permalink)
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good info Brettski
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Old 08-20-2011, 07:57 PM   #8 (permalink)
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Wow! Those converters are pretty helpful! I found one that shows my current size (235/40 R18) compared to the stock OEM has a percent difference of 5.998% and the ones I'm looking to purchase (225/40 R18) has a difference of 4.818% so it looks like I'll be getting the latter.

Thanks to all for your input! You guys rock!

Cheers!
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Old 08-21-2011, 06:57 AM   #9 (permalink)
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Glad it helped you out.

Put some photos up when you've got it all sorted.
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