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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 tire size for square setup?



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      10-10-2013, 08:31 PM   #1
tomtom11
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what tire size for square setup?

Hello everyone, this is my current setup.


Tires
Front: 235/35/19
Rear: 265/30/19



Rims
Front: 19x8.5/ET-35
Rear: 19x9.5/ET-33

i want to get a square tire setup but feel there would be too much lip exposed if i put 235/35/19 on my rears. putting 265/30/19 on the front wont work because it will rub since i am lowered on Bilestein sport shocks and H&R sport springs. is there an in between that would not rub the front and not have too much lip on the rear and be within the rolling diameter spec? thank you

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      10-11-2013, 01:58 PM   #2
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As far as wheel sizing goes, I've seen people run 19x9.5 ET33 front with 235/35/19 tires, but if you go wider you might need to do some fender work up front. Definitely isn't recommended!
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      10-11-2013, 06:17 PM   #3
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Originally Posted by VMRWheels View Post
As far as wheel sizing goes, I've seen people run 19x9.5 ET33 front with 235/35/19 tires, but if you go wider you might need to do some fender work up front. Definitely isn't recommended!
is there a 245/30/19 or something like that ?
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      10-11-2013, 08:05 PM   #4
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245/30/19s exist, however that size is not common.
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      10-11-2013, 09:30 PM   #5
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sorry for the questions but is there a reason i should get the narrower tires if i could go with 245 without rubbing issues?
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      10-11-2013, 09:40 PM   #6
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what about 245/35/19
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      10-12-2013, 12:16 AM   #7
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Originally Posted by tomtom11 View Post
sorry for the questions but is there a reason i should get the narrower tires if i could go with 245 without rubbing issues?
There's no reason you couldn't use use a 245/35/19 up front with 9.5 et33 you could also use 9.5 et 20-22 in the rear with the same size tire.
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      10-12-2013, 12:56 AM   #8
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Wait. Are you wanting to put square tires on your staggered wheels?
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      10-13-2013, 10:34 PM   #9
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Quote:
Originally Posted by VTECaddict
Wait. Are you wanting to put square tires on your staggered wheels?
Yeah. I was thinking about keeping my current rims and getting a square tire setup. That's why I think the 235's will show way too much lip for me on the rear wheels. Will I get the handling benefits of a square tire setup even if my rims are staggered?
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      10-14-2013, 09:29 AM   #10
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Originally Posted by tomtom11 View Post
Yeah. I was thinking about keeping my current rims and getting a square tire setup. That's why I think the 235's will show way too much lip for me on the rear wheels. Will I get the handling benefits of a square tire setup even if my rims are staggered?
Unless you wnat to change the wheels I would keep it as is.
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      10-14-2013, 10:39 PM   #11
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Unless you wnat to change the wheels I would keep it as is.
is there a reason for that? i assumed the handling benefits ie. less understeer comes from a square tire setup regardless of the wheel dimmensions
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      10-14-2013, 11:09 PM   #12
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Originally Posted by tomtom11 View Post
is there a reason for that? i assumed the handling benefits ie. less understeer comes from a square tire setup regardless of the wheel dimmensions
What about the difference in handling caused by having a slightly stretched rear tire compared to no stretch in the front? IMO there's not much difference between square and staggered, but if you want square you should have a square set of wheels.
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      10-14-2013, 11:31 PM   #13
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Stick with staggered tires for staggered wheels. Not only is it going to look really bad, but handling would be weird since there will be more sidewall flex in the front due to less stretch.

What are you doing that you're noticing and wanting to reduce understeer?
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      10-16-2013, 07:11 PM   #14
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ok thank you guys. would going with 245/35/19 275/30/19 setup work?
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      10-16-2013, 07:28 PM   #15
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Quote:
Originally Posted by tomtom11 View Post
ok thank you guys. would going with 245/35/19 275/30/19 setup work?
235/35 Front, 275/30 rear would be best because they match wheel diameter and won't affect your speedo readings, unless you don't care.

Since all of your power is in the rear, you need more rubber in the back. Skinny tires up front (although I wouldn't consider 235 skinny) help with turn in dynamics to lessen understeer under power IMO. Understeer is a result of too much power going into a turn that causes the front tires to lose grip at the limits of adhesion. More tread doesn't necessarily eliminate nor minimize understeer if you are going into a turn too hot. Trail braking and threshold braking has more to do with good turn-in rather than tread width up front.

Use the best combo of tire sizes and mind your turn ins into a turn and you will be successful, regardless of tire brand... to an extent.
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