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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 > Square setup E90 335 max tire size on 18x8.5



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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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      10-10-2008, 06:53 PM   #1
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Square setup E90 335 max tire size on 18x8.5

I keep going back and forth and changing my mind about whether to go with 17x8.5 wheels (Kosei) on 245-40-17 all around, or to spend a little more
and go with 18x8.5 wheels (I like the SSR's) .. Not sure what tire size would fit all around on stock suspension, no camber, and no spacers
I know 235-40-18 would work, but would any bigger size also work?
Maybe 245-35-18 all around?

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      10-11-2008, 09:50 PM   #2
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245/40/18 will work, possibly 255/35/18 which has a smaller diameter ( 25.03 vs 25.7) but more width. 265/35/18 rubs some up front from reports.
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      10-12-2008, 01:42 PM   #3
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I would also recommend 245 all around- go for it.
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      10-13-2008, 12:44 AM   #4
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245-40 or 245-35?
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      10-13-2008, 01:23 AM   #5
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Just curious, why do a square setup?
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      10-13-2008, 01:45 AM   #6
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Quote:
Originally Posted by Bimmer Loyalist View Post
Just curious, why do a square setup?
Allows for maximum contact patch and will less likely roll on the tire shoulder during cornering. In general, wider is better in Autocross.
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      10-13-2008, 02:15 AM   #7
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Quote:
Originally Posted by Bimmer Loyalist View Post
Just curious, why do a square setup?
Your kidding, right?

You have over 5,000 posts.
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      10-13-2008, 12:08 PM   #8
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Quote:
Originally Posted by Bimmer Loyalist View Post
Just curious, why do a square setup?
I will assume you are serious and answer the question:

1. Staggered setup from the factory is a passive safety feature that induces understeer (considered easier and safer to handle than oversteer)
2. Stagerred is ALL SHOW AND NO GO
3. I cannot get this car to rotate the way I want it to on the track, so I need to dial the understeer out
4. Square setup means you can rotate the wheels and get the tires to last longer
5. Less unedersteer also means fronts will live much longer

Back to my question guys: 245/40 or 245/35 all around (18')
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      10-13-2008, 01:26 PM   #9
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255/35/18 if you are looking for more rubber (width). I plan to do that with my 330i. My answer would depend on what type of rubber I was looking for and the sizes available in that rubber.

Regards,

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      10-13-2008, 01:32 PM   #10
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That's the rear stock size!! Those don't fit at the front, do they ?
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      10-13-2008, 06:19 PM   #11
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ya, i want to know too, does the stock rear size fit the front?
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      10-13-2008, 06:36 PM   #12
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they do fit...I test fitted 18x9 +35 with 265/35/18 for the front and surprisingly no rub even on full turn, might rub over bumps though. I'll do 255/35/18 all around when I get my next track set up.
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      10-13-2008, 07:47 PM   #13
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Quote:
Originally Posted by Gen_E92 View Post
they do fit...I test fitted 18x9 +35 with 265/35/18 for the front and surprisingly no rub even on full turn, might rub over bumps though. I'll do 255/35/18 all around when I get my next track set up.
+1. 255/35/18 fit fine up front.

I run 265/35/18 18x9 ET25 up front with lots of negative camber using a camber plate for the autocross...otherwise 255/35/18 with "stock-like" camber settings work without any issues.
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      10-13-2008, 09:39 PM   #14
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Quote:
Originally Posted by Bimmer Loyalist View Post
Just curious, why do a square setup?

Staggered with bigger tires in back is good for drag racing if you have a rear wheel drive or for the looks.

Driving on a track, we need more width up front to counter-act the understeer present, and also reducing the rear width helps that too.

I have an Xi which stock has even more understeer than the rear wheel cars (can't get power oversteer as you drive the front wheels too)
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      10-14-2008, 09:03 AM   #15
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Quote:
Originally Posted by Ramos View Post
I will assume you are serious and answer the question:

1. Staggered setup from the factory is a passive safety feature that induces understeer (considered easier and safer to handle than oversteer)
2. Stagerred is ALL SHOW AND NO GO
3. I cannot get this car to rotate the way I want it to on the track, so I need to dial the understeer out
4. Square setup means you can rotate the wheels and get the tires to last longer
5. Less unedersteer also means fronts will live much longer

Back to my question guys: 245/40 or 245/35 all around (18')
Those are all true, unless you have a coil-over set-up with adjustable sway bars and can dial in the suspension the way you want it to handle. I'm running staggered for my track set-up and the car is completely neutral because that's the way I set it up. I can dial in over steer if I choose also with my adjustments. An LSD would help with rotation on my car as well

That being said: I'm running 245/35 up front with NO rubbing issues at all. My car is pretty low also. I would think you could run either a 35 or 40 series with a 245 section width. You could also run a 255/35 all around. I don't think you'll have an issue with rubbing up front as I know several people running that tire without issues.
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      10-14-2008, 10:59 AM   #16
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I would go with 245-40-18 myself, but 35 would work also.

Someone I know went with set-up and really likes to way the car feels on the track now btw! Think this is what you are looking for!
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      10-14-2008, 11:22 AM   #17
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245/40 is also cheaper tire wise.. The DUnlop Star Specs come in that size but not in the 245/35.. Good tire for $182 = good deal
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      10-14-2008, 11:35 AM   #18
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Quote:
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245/40 is also cheaper tire wise.. The DUnlop Star Specs come in that size but not in the 245/35.. Good tire for $182 = good deal
Actually I think he is running a Dunlop tire ?!?!? Not sure!
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      10-14-2008, 12:02 PM   #19
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The Dunlop Star Specs are a great tire, they also run fairly wide for the size. I'd consider their 245/40/18 tires as big as some manufacturer's 255 tires.
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      10-14-2008, 12:17 PM   #20
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Quote:
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The Dunlop Star Specs are a great tire, they also run fairly wide for the size. I'd consider their 245/40/18 tires as big as some manufacturer's 255 tires.
So which size would you recommend for no rubbing on stock suspension?
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      10-14-2008, 12:55 PM   #21
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For maximum grip, 255/35/18 would work all around. Just be sure to get the proper offset wheels.
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      10-15-2008, 09:35 PM   #22
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What is the proper offset?

I can look here : http://www.1010tires.com/WheelOffsetCalculator.asp
And I can see what the differences are between offsets/sizes, but what I'm looking for is a set of limits. I.E. you can go X mm more in or Y mm more out, before you have any problems.

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