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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 > What size tires for 18.5/18.9?



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Wheel offset calculator courtesy of BimmerPost.com. You may use this calculator to calculate what tire sizes you might need if you upgrade your tires, or what wheel sizes/offsets are compatible with your car.
    Current Wheel Width  inches             Current Wheel Offset  mm.
         New Wheel Width  inches                  New Wheel Offset  mm.
 
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ORIGINAL TIRES
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NEW TIRES
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Based on your stock wheel setup, your new wheel will have:
Original Tires Diameter (in.)
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  Difference in diameter (in.)
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      01-03-2013, 09:55 PM   #1
aph335i
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Just ordered me some 18x8.5 et 35 18x9.5 et 35 wheels for my 09 335i coupe. Tirerack suggest 225/40 fronts and 255/35 rears. Can I go any wider than this since I have those extra .5's and without creating any alignment issues? What is the widest I can go safely?
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      01-04-2013, 10:14 AM   #2
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235 front and 265 rear are the standard wider options.
you can check this forum for exact aspect ratio for 18'' wheels.
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      01-08-2013, 01:28 PM   #3
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Does the sidewall remain same? So it would be 235/40-18 and 265/35-18 yeah? Also, if I wanted a 255 rear would I need to get a 225 front? If there any benefit to have the -10mm or am
I better off with the wider set?
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      01-08-2013, 01:47 PM   #4
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Quote:
Originally Posted by aph335i View Post
Does the sidewall remain same? So it would be 235/40-18 and 265/35-18 yeah?
Yes that's correct.
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      01-08-2013, 01:49 PM   #5
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Quote:
Originally Posted by MonacoBlueE90
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Originally Posted by aph335i View Post
Does the sidewall remain same? So it would be 235/40-18 and 265/35-18 yeah?
Yes that's correct.
Cool. As far as comfort and smoothness, would I want 235/265 or the 225/255 ? Or will it be the same? Obviously I'll get better traction with the wider set?
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      01-08-2013, 01:59 PM   #6
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Cool. As far as comfort and smoothness, would I want 235/265 or the 225/255 ? Or will it be the same? Obviously I'll get better traction with the wider set?
With wider tyre setup you get better protection for the wheels. It also might be little bit more comfortable,because more rubber, but also tyre brand/rubber stiffness affects to that.
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      01-08-2013, 02:14 PM   #7
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Yeah I'm going to get the hankook Ventus v12 evos. They seem well balanced between comfy and performance.
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      01-08-2013, 02:48 PM   #8
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on 19x8.5/19x9.5 I am able to fit 245/275. Would this not be the case with 18" wheels? Widths are the same.
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      01-08-2013, 02:50 PM   #9
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Originally Posted by R 4 5 T 4 M 4 N
on 19x8.5/19x9.5 I am able to fit 245/275. Would this not be the case with 18" wheels? Widths are the same.
It's possible. But I want to keep a decent sidewall for pothole protection. That's why I chose 18s. If I wider then I'd have to go smaller sidewall.
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      01-08-2013, 04:06 PM   #10
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Quote:
Originally Posted by aph335i View Post
Just ordered me some 18x8.5 et 35 18x9.5 et 35 wheels for my 09 335i coupe. Tirerack suggest 225/40 fronts and 255/35 rears. Can I go any wider than this since I have those extra .5's and without creating any alignment issues? What is the widest I can go safely?
245f and 265r or 255f and 275r
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      01-08-2013, 07:18 PM   #11
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Quote:
Originally Posted by NokTurNaL 330i
Quote:
Originally Posted by aph335i View Post
Just ordered me some 18x8.5 et 35 18x9.5 et 35 wheels for my 09 335i coupe. Tirerack suggest 225/40 fronts and 255/35 rears. Can I go any wider than this since I have those extra .5's and without creating any alignment issues? What is the widest I can go safely?
245f and 265r or 255f and 275r
Doesn't 245F and 265R create some kind of ratio being off? I thought if I choose 265 rear then I need to have 235 front. And if I chose 255 rear, id need 225 front? Am I wrong?
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      01-08-2013, 11:51 PM   #12
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Originally Posted by aph335i View Post
Doesn't 245F and 265R create some kind of ratio being off? I thought if I choose 265 rear then I need to have 235 front. And if I chose 255 rear, id need 225 front? Am I wrong?
Yeap wrong. Use the calc on top if you want and search-read-learn.

245 on 8.5 and 265 on 9.5 max. Wider rubber = higher grip.
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      01-09-2013, 03:04 PM   #13
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Quote:
Originally Posted by NokTurNaL 330i
Quote:
Originally Posted by aph335i View Post
Doesn't 245F and 265R create some kind of ratio being off? I thought if I choose 265 rear then I need to have 235 front. And if I chose 255 rear, id need 225 front? Am I wrong?
Yeap wrong. Use the calc on top if you want and search-read-learn.

245 on 8.5 and 265 on 9.5 max. Wider rubber = higher grip.
Are you sure? Can anyone else confirm this? I'm 100% I want to have the 265/35-18 rear. What front do I need? And when you suggest 245... Is it 245/40-18?
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      01-10-2013, 01:47 AM   #14
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235 r40 front
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      01-10-2013, 10:39 AM   #15
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Originally Posted by neilvosko
235 r40 front
Is this the final answer? I'm
Looking at 235/40 & 265/35?
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      01-10-2013, 12:17 PM   #16
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yep that's it. .1 inch difference in diameter
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