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BMW 3-Series (E90 E92) Forum > E90 / E92 / E93 3-series Technical Forums > Wheels and Tires Forum Sponsored by The Tire Rack > Wheel size e90. Better size?



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      11-26-2011, 05:33 AM   #1
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Wheel size e90. Better size?

For handling, stock ish look:

18 x 8.5. 35 et square

Or


18x8.5 35 front
And
18x9.5 45

Thanks

Spacer required?Ysize ok?
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      11-27-2011, 06:24 PM   #2
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235 and 265 staggered tyre setup is a logical choice for a 335i. For the 18x9.5 ET45, you might want to use a spacer, especially if your car is E90 sedan from 2008 or earlier.
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      11-27-2011, 08:56 PM   #3
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Would those wheels be the correct size for the stock 235 (or is it 225?) and 265 rubber, or are the wheels slightly too wide - better 8 and 9"?

And for the 45 offset on the 9.5 - how much of a spacer to keep a good look consistent with the fronts?

Are there any negatives with using spacers?

Thanks
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      11-27-2011, 09:09 PM   #4
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8.5 and 9.5 are the most popular sizes for 235 and 265 rubber. You can drop to 8.0 and 9.0 which will give the rims a bit more protection. Both rim sizes are suitable. If you want to keep the stock sized 225 and 255 rubber, then the 8" and 9" rims are a better fit. Some rims may not be strong enough for runflats, so you should ask the vendor about that.

The spacer size depends on whether you have coupe or sedan and the model year in the case of e90 sedan.
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      11-27-2011, 09:52 PM   #5
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Very helpful. 2008 sedan, btw

Setting cosmetics aside, for street use only, for handling, which is preferred between stock sizes of 18" 225/255 and 18" 235/265 discussed?

Tire selections equally available as well?
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      11-28-2011, 01:03 AM   #6
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The 2008 sedan is the pre-facelift model so you would be better to have rear wheels with less than +45mm offset. 30 to 33 would be ideal. Otherwise you could fit a 15mm spacer. The most common problem with spacers is removing them once they get rusted onto the hub. Its better to get wheels with the right offset instead of using spacers, as there is a small possibility that the spacer will cause the wheel to be slightly off-center.
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      11-28-2011, 03:45 AM   #7
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What offset calculation should I aim for?

Is front Size: 18x8.5, 38mm Offset and rear 18x9, 45mm Offset better?
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      11-28-2011, 04:55 AM   #8
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For 235 front tyres, I would aim for ET32~ET35. For 265 rear tyres, I'd aim for ET30~ET33. For 255 rear tyres you could just subtract 5mm to make it ET25~ET28 to end up with the same rear fender clearance. OTOH, if you want a properly aggressive fitment, then you can use lower offsets provided you aren't scared of fender rolling and camber adjustment.
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      11-29-2011, 12:18 PM   #9
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Thanks!

Down to 3 options two of which are expensive forged wheels, and the third which is bargain price, rotary forged. All are 18" but around 20lbs each so light. To replace the stock wheels. Looking for a relatively stock not aggressive look, and don't want to worry about fender rolling, etc so clearance important.

I prefer not to have spacers but would consider them.

Which is the best sizing? And if the forged ones are, is it so much better? thanks, 2008 e90

Option 1 (inexpensive, rotary forged, 18", 20lbs)
front Size: 18x8.5, 38mm Offset
rear 18x9, 45mm Offset

Option 2 (bbs, forged, 20lbs 18", expensive)
18x 8" 35 offset
18x9.5 40 offset

Option 3 (bbs, forged, 20lbs, 18", expensive)
18x8.5" 38 offset
18x9.0" 45 offset

Which is best clearance, not requiring spacers?

thanks,
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      11-29-2011, 03:59 PM   #10
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None of these options look to be perfect offsets for MY08 E90 (assuming your car has build date up to 8/2008). I think the sizes you found are the ones recommended for the LCI facelift model with 2009 model year onwards (like the one in my avatar).

There is a difference between 18x9 ET45 and 18x9.5 ET40. They 18x9.5 ET40 will have a bigger fender gap than you need, but its ok. For the the 18x9 ET45, the outside rim will appear sunken in by an additional 11mm, which is easily noticible. I think if you ask around, you would find the BBS wheels with a 35mm offset which would look better without spacers. Also you can go to the BBS website and download their application guide.
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      11-29-2011, 10:15 PM   #11
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I'm running (bbs, forged, 20lbs 18", expensive) in 18x8.5 ET38 and 18x9.5 ET33 on an LCI e90, if that helps.
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