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X3 F25 (2011 - current)
The latest X3 brings some added style and some new features to the BMW SUV family. Talk about the new F25 now!

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  #1  
Old 05-18-2011, 11:18 AM
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harplayr harplayr is offline
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Mein Auto: 2011 BMW X3 28i
Is going from 17" to 18" worth it?

I have a 28i without sports package or dynamic handling package.
It has the standard 17Ē wheels.

Weíve been having some very windy days (25mph +) and Iíve noticed it makes the car slightly wobbly at least when compared to my previous BMW's.

Iím wondering if going to an 18 inch wheel with the resulting lower profile sidewall would help this in any respect, or is what Iím feeling just a result of the suspension. I donít want to go larger than 18Ē as I still want to keep ride quality a priority (we have terrible roads here).

Can I expect the dealer to give me something on trade in on my original set of wheels (approx 200 miles on them)?
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  #2  
Old 05-18-2011, 03:36 PM
Cactus Cactus is offline
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Mein Auto: 2011 X3 2.8i
Quote:
Originally Posted by harplayr View Post
I have a 28i without sports package or dynamic handling package.
It has the standard 17Ē wheels.

Weíve been having some very windy days (25mph +) and Iíve noticed it makes the car slightly wobbly at least when compared to my previous BMW's.

Iím wondering if going to an 18 inch wheel with the resulting lower profile sidewall would help this in any respect, or is what Iím feeling just a result of the suspension. I donít want to go larger than 18Ē as I still want to keep ride quality a priority (we have terrible roads here).

Can I expect the dealer to give me something on trade in on my original set of wheels (approx 200 miles on them)?
I would attribute the wobbly feel to the fact that the vehicle is alot taller than a car. It is natural for trucks and SUV's to be a little more "tippy".

If you do go with 18" wheels, I would be interested in your stock 17" wheels for winter tires.
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  #3  
Old 05-18-2011, 03:47 PM
Glen E Glen E is offline
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it should not make a diff and no, he won't give you anything for your wheels....
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  #4  
Old 05-18-2011, 05:00 PM
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harplayr harplayr is offline
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Quote:
Originally Posted by Cactus View Post
I would attribute the wobbly feel to the fact that the vehicle is alot taller than a car. It is natural for trucks and SUV's to be a little more "tippy".

If you do go with 18" wheels, I would be interested in your stock 17" wheels for winter tires.
As far as the wobbly feel, Iím comparing it to my previous generation X3 that I traded in and not a car.
I know that it had a much stiffer suspension, but Iím looking for a happy medium.

Overall Iím very pleased with the F25ís ride quality, and in most conditions am fine with the handling but I was looking for just a little bit more side to side stiffness for those very windy days. I was wondering if by going to a slightly lower profile tire if it would provide any measurable improvement in that regard without sacrificing too much of the ride quality.
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Get your facts first, and then you can distort them as much as you please. (Mark Twain)

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  #5  
Old 05-18-2011, 05:14 PM
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AzNMpower32 AzNMpower32 is offline
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No, a larger wheel size won't affect stability. The DHP and sports suspension (not available in North America) would hunker things down a bit.
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  #6  
Old 05-18-2011, 05:31 PM
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harplayr harplayr is offline
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Originally Posted by AzNMpower32 View Post
No, a larger wheel size won't affect stability. The DHP and sports suspension (not available in North America) would hunker things down a bit.
I was going on the theory that tires can have an impact on handling and that larger profile tires would have a little more play laterally than smaller profile tires. I may try putting a couple of extra pounds of air in them to see if that has any impact.

As far as getting different options, thatís a non-starter. The car has already been built.
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If time heals all wounds, why do zombies have such poor complexions?

Get your facts first, and then you can distort them as much as you please. (Mark Twain)

any spelling or gramitical errors on my part are just glitches that appear to those that are not pproperly keyed into my code generator. If this occurs, pleas PM me for an updated deKription key.
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Old 05-18-2011, 05:40 PM
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AzNMpower32 AzNMpower32 is offline
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The Variable Steering (also part of DHP) probably would also help. I felt the electric steering in the X3 was a bit lifeless and overboosted, which can contribute to a bit less driver confidence even in a straight line.

The difference in sidewall and flex is really not going to show up until you corner really hard and start squealing the tires. You'd be going from a 55- to a 50 sidewall aspect ratio, hardly a change. The base versions in Europe get a more comfortable ride with non-RF and P225/60R17 tires as standard. Going from those tires to the 18" might elicit a more noticeable change.
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  #8  
Old 05-19-2011, 07:41 AM
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harplayr harplayr is offline
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Mein Auto: 2011 BMW X3 28i
I increased tire pressure from the recommended 32psi all around to 35psi all around and it did seem to improve handling a bit, a little more "connected" feeling and didn't impact ride quality noticeably.
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If time heals all wounds, why do zombies have such poor complexions?

Get your facts first, and then you can distort them as much as you please. (Mark Twain)

any spelling or gramitical errors on my part are just glitches that appear to those that are not pproperly keyed into my code generator. If this occurs, pleas PM me for an updated deKription key.

Last edited by harplayr; 05-19-2011 at 07:43 AM.
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