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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 > Questions about tire sizes and alignment



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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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      12-27-2012, 06:35 PM   #1
thenewrick
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Questions about tire sizes and alignment

Howdy. I just bought some Axis Rev wheels in 18x8.5 and 18x9.5 sizes.

Do I need to use any type of spacers or extra hardware? I'm looking for form<function.

What tire sizes would be all around best? I was looking at Pilot Super Sport tires in sizes 225/40/18 and 255/35/18. Do those sound perfect or is there a better size?

I was planning on getting an alignment as well with the new setup. I wanted something essentially stock but with a hint of added sportiness.

On my Subaru that meant a little positive caster and a little negative camber but I'm clueless on the BMW.
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      12-27-2012, 06:43 PM   #2
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Without offsets we can't say if you'll need spacers for the wheels to sit flush or not.
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      12-27-2012, 06:46 PM   #3
thenewrick
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Here's a link to the wheels.

http://www.tirerack.com/wheels/Wheel...All&sort=Brand

Offset is 35 and 40

I was hoping to avoid the style where the wheel lip extends far past the tire. Just looking for a stockish setup with a hint of sportiness
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      12-27-2012, 06:49 PM   #4
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Those are going to look pretty sunk in with the smaller rim and higher offsets you purchased. I would recommend spacers for the new set up to get a better look
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      12-27-2012, 06:53 PM   #5
thenewrick
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So the spacer would push the wheel away from the car and essentially give it a wider base for more stable handling? What is the most conservative setup with spacers you think? I only have about 1/2 inch of gap in the rear so I can't do anything that would jeopardize my wheels rubbing. I'm going for function>form
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      12-27-2012, 07:27 PM   #6
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Those offsets are fine. Don't listen to all the hellaflush stance homos that will tell you to keep pushing the limits.

I would use 225/40 and 255/35. As for alignment I use the stock settings for nice, even tire wear.
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      12-27-2012, 07:36 PM   #7
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If I were trying to get a tiny bit more handling response would I just want a hint of extra negative camber all around?

I thought spacers helped with handling and don't look hellaflush if you get small ones?
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      12-27-2012, 08:37 PM   #8
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I think a 235/40/18, 265/35/18 will look/perform better on a 8.5 and 9.5.
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      12-30-2012, 11:17 AM   #9
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Can't comment on the offsets, but recently put snow tires on 18"x8.5"/18"x9.5" Avant Garde M359 wheels for my 335is, which I believe has the same suspension and brakes as the sport package 335i. Went with 235/40/18 and 265/35/18 tires. After a week of normal driving on smooth and rough roads have not experienced any rubbing. The fitment is a little more flush than stock without looking too Fast n' Furious in the company parking lot.
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      12-30-2012, 02:06 PM   #10
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I'm leaning towards 235/40 265/35 now. I don't want any exposed wheel lip. Hopefully they fit nicely! I only have about a half inch of gap in the rear currently with my 18x8.5 255/35 setup. I hope the bigger wheels and tires fit!
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      01-07-2013, 02:35 AM   #11
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Quote:
Originally Posted by VMRWheels View Post
I think a 235/40/18, 265/35/18 will look/perform better on a 8.5 and 9.5.
For the longest time, everyone listed tire sizes to be used with the staggered wheel setup (8.5 & 9.5) as 225/40 & 255/35 - Tire Rack STILL lists these as the recommended sizes...

Why are vendors now listing the 235/40 & 265/35 as the sizes to use?
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