01-23-2013, 06:12 AM | #1 |
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Anybody changed their tire size on 19' rim?
My X3 MSport rides a little bit stiff and bouncy. I'm planning to change the tires to non RFT and changing the tires size as well. Currently, i have the 245x45x19 an would like to put a 235x55x19. I appreciate if you could give me some insights.
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01-23-2013, 10:55 AM | #2 |
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Tire change
I agree that a non run flat tire with a higher aspect ratio is really the way to go. The question is do you agree with BMW.CA who advise you not to change tire size.
Frankly, I do not believe that the small change in aspect ratio will have any significant impact on the X3, maybe a slight measure of change on the speedometer. But thats it. |
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01-23-2013, 12:42 PM | #3 |
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You could change to non-run flats without any issues but I wouldn't change the aspect ratio on the tires. All of the electronics systems like stability control are calibrated to a specific tires size so you could run into problems. In fact I read a post on one of these forums where some changes the tires/rim with a different size than recommended and he was getting chassis stabilization errors. The problem went away when he put the original tires back on.
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01-23-2013, 04:27 PM | #4 | |
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01-23-2013, 04:46 PM | #5 |
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If the F25 is as tire sensitive as the E83, I'd certainly be careful of changing tire profiles, particularly if you run a staggered setup.
There have been a lot of transfer box issues and drivetrain 'bunching' problems here in the UK in the E83, even changing from OEM 'star' approved tires. Usually gets back to wrong tire matching, even if using generic sizes. HighlandPete |
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01-23-2013, 04:51 PM | #6 |
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Agree with comments here. Could have problems in going from 245/45/19 to 235/55/19. That is a 5.4% increase in tire diameter (38mm or 1.5") and besides the speedo error (speedo will read 5.4% low) may have problems with clearances and the cars electronics. In fact - don't know what your local laws are, but here in Australia the change would be illegal.
Tony |
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01-23-2013, 04:59 PM | #7 | |
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01-23-2013, 08:10 PM | #8 |
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Really appreciate the advice and insights on this tread. Now I'm stuck in my decision to either maintain the tire size and just go to a non RFT or change the tires size to a 235x50x19 which is about 3.5 ratio which is below the 5 (max ratio). Is there really a change in ride (not stiff and bumpy) when using a non RFT?
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01-24-2013, 09:43 AM | #9 | |
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