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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 should I get?



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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.
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         New Wheel Width  inches                  New Wheel Offset  mm.
 
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      04-05-2012, 04:15 PM   #1
vasillalov
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What size tires should I get?

Hi folks,

My 3pc wheels will be shipping tomorrow and I will be looking to purchase new summer tires for them.

Wheel specs:
Front: 18x9 et 30
Rear: 18x10 et 25

Car: 2008 335i E90 pre-lci with sport suspension. No suspension mods currently.

Goal:
1. No stretching
2. No rubbing
3. Optimal thread width for track use.


So far I've come up with the following specs for tires:

Front: 245x40x18
Rear: 265x35x18 although I think I should be able to fit 275s in there...

Thoughts, ideas, suggestions are highly appreciated.
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      04-05-2012, 04:17 PM   #2
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245 up front. 275 out back.
Not sure on profile but I would have to guess without doing some math that a 245/35 and a 275/30 would be good.
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      04-05-2012, 04:18 PM   #3
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245 front
275 rear
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      04-05-2012, 04:30 PM   #4
vasillalov
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Ok, so I was close,

245F and 275R sounds doable indeed.

What's the recommended profile for these? Wouldn't going down from 45 to 40 and 35 to 30 profile make them super stiff?
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      04-05-2012, 04:40 PM   #5
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That's a pretty aggressive rear wheel. You will need to roll your fenders if you want to fit a 275 tire.
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      04-05-2012, 04:43 PM   #6
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Quote:
Originally Posted by Wes. View Post
That's a pretty aggressive rear wheel. You will need to roll your fenders if you want to fit a 275 tire.
...now you are scaring me. LOL I don't want to roll fenders at all.

I might put the wheels on first without tires and check things out before I order tires.

How do I go about finding out what size tire I would need once I test fit the wheels?
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      04-05-2012, 04:51 PM   #7
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Quote:
Originally Posted by vasillalov View Post
How do I go about finding out what size tire I would need once I test fit the wheels?
I think you're approaching this problem the wrong way. You've already said that you don't want to stretch your tires, don't want to rub, and want something good for the track.

For you, it's a matter of what are the right tires for the wheels, and how can you work your car around that setup. Working tires around a type of wheel is how stanced guys end up with their tires.

If you don't want to roll your fenders, I think you will need less aggressive wheels.

Edit: Just noticed that you have an E90. I think there might be a little more clearance on the E90 than on the E92, but it would be nice for an E90 owner to chime in and give us a definite answer.
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      04-05-2012, 05:12 PM   #8
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Thanks, yeah the E90 pre-lci has more clearance indeed.
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      04-07-2012, 12:08 AM   #9
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245/40/18 in the front and get as much negative camber as you can - definitely knock out the "alignment" pins.

275/35/18 in the rear will need a healthy fender roll / minor pull. Stick to 265/35/18 if you don't want to do that.
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      04-07-2012, 01:28 AM   #10
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pre-lci e90 on stock suspension shouldnt need a fender roll to fit 275's... but i just saw that your rears are going to be +25... you'll be okay with 265's no problem.
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      04-07-2012, 09:03 AM   #11
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Thanks for everyone who replied. I chose the wheels specs based on my earlier thread here:

http://www.e90post.com/forums/showthread.php?t=589058

and particularly the recommendation from Gavin@MMW. So I am hoping that those tire specs will work.
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