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E90/E91/E92/E93 (2006 - 2013)
The E9X is the 4th evolution of the BMW 3 series including a highly tuned twin turbo 335i variant pushing out 300hp and 300 ft. lbs. of torque. BMW continues to show that it sets the bar for true driving performance! -- View the E9X Wiki

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  #1  
Old 06-23-2014, 06:16 PM
john Dew john Dew is offline
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Mein Auto: 07 E90/09 Porsche Turbo
Sports Package Staggered Change to 17' all 4

Has anyone ever tried putting 17'' all around on a sports package?

I have the opportunity to change all 4 rims but wanted to make sure I could and wouldn't mess up the feel too much-

Willing to give a little so I can rotate and balance and have non run flats..

Thanks in advance
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  #2  
Old 06-24-2014, 02:44 AM
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Zooks527 Zooks527 is offline
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Sure, assuming you have stock brakes, you can do that on an E90 without any issues.
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Old 06-24-2014, 06:57 AM
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need4speed need4speed is offline
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I would think it would mess with the handling a fair amount. To me it would be like the people who buy the car, then want to put regular gas in it. If you wanted one with the sport pkg. (as God and BMW intended it) why change the tires. Get what you paid for, with the best sport pkg handling you can. N4S
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Old 06-24-2014, 06:29 PM
R608 R608 is offline
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Mein Auto: '06 325i 6MT Sport Pkg
17" refers to the diameter which is always the same at all four corners on these cars. I assume you really meant 8" vs. 8.5" width all around. I run a square setup for winter. It works just fine. Someone who tracks his/her car could say more definitively, but my understanding is these cars are set up to understeer at the limit. Logic says getting rid of the relatively wider rear tires should reduce rear grip and, therefore, the amount of understeer.
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Old 06-24-2014, 06:39 PM
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floydarogers floydarogers is offline
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Sport package is 18" staggared setup. Going to a 17" square will result in some loss of sharpness in steering (turn-in), and perhaps a bit of lateral grip due to the sidewalls bending a bit more and "rolling over". As mentioned, a square setup will reduce understeer, mostly due to an increase in oversteer from the narrower rears.

It should improve the ride (RFT or go-flat), and reduce any chance of sidewall bubbles from potholes, and reduce the chance of bent rims from curbs/potholes.
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Old 06-24-2014, 06:41 PM
R608 R608 is offline
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Quote:
Originally Posted by floydarogers View Post
Sport package is 18" staggared setup...
Depends on the model. Could be true for the OP, but if he just has the base N52 car like mine it's 17" wheels for the sport package and 16's w/o.
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Old 06-24-2014, 08:54 PM
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floydarogers floydarogers is offline
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Quote:
Originally Posted by R608 View Post
Depends on the model. Could be true for the OP, but if he just has the base N52 car like mine it's 17" wheels for the sport package and 16's w/o.
Considering that the OP has a Porsche Turbo, I think it's likely he has a 335i.
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Old 06-25-2014, 08:36 AM
EnjoyDrivingMN EnjoyDrivingMN is offline
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Thanks to OP - i just wanted to ask the very same question for my 2011 335ix coupe - the only difference is that i would stick to my 18" rims and just put 8" tires all around!!
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Old 06-25-2014, 08:53 AM
fdriller9 fdriller9 is offline
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It depends on what your goal is. Running a square setup can help reduce understeer, especially on the AWD models.

It also allows you to rotate tires front to back and vice versa with directional tires and criss cross front to back with non-directional tires.
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