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Wheel gap reduction--without lowering?
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10-11-2009, 04:22 AM | #1 |
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Wheel gap reduction--without lowering?
I know this has been covered before, but I don't see why this wouldn't work.
As with most xdrive owners that have stock suspension, I can fit four fingers in the gap from the top of the tire to the fender. My car currently has 225/45/17s (63.43 centimeter diameter) all around. I want to upgrade the wheels to 19s, but also increase the diameter in order to fill some of the wheel gap without lowering. This would mean picking a higher profile tire for the new wheels, but still maintaining 1% or less for the rolling diameter. With the setup of 235/45/19 (69.41 centimeter diameter) front and 265/40/19 rear the front wheel gap alone would be reduced by 2.4 inches (6 centimeter increase in diameter over stock). This combination also allows the rolling diameter to be 0.1% Why wouldn't this work? Am I missing something? That seems like a major decrease in wheel gap without having to drop. I don't think that the 2.4 inch increased diameter in the rear would cause it to rub. Any thoughts?
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10-11-2009, 04:27 AM | #2 | |
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No 265/40/19 tires
Quote:
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2011 E92 M3 DCT/AW/Black Extended/Premium/Convenience/Enhanced audio/19" VMR wheels MODs:[B] OEM BMW CF rear spoiler/OEM BMW CF front splitters/OEM CF mirror covers/M Performance exhaust/H
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10-11-2009, 09:21 AM | #3 |
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Not a good idea.
Your speedometer and odometer will be off by over 8% and the dealership will - correctly - deny warranty service on suspension and drivetrain bits. On second thought, the dealer may deny any warranty service because of the odometer issue. |
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10-13-2009, 11:27 AM | #5 |
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How do you figure?
What calculation are you using? Here is an example: Running 235 45 18s up front and 265 40 18s rear there is only 0.1% difference in the speedometer based on the calculated rolling radius. That is almost perfect, although it isn't what BMW would recommend. This setup would also take 1.4 inches from the front wheel gap.
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2011 E92 M3 DCT/AW/Black Extended/Premium/Convenience/Enhanced audio/19" VMR wheels MODs:[B] OEM BMW CF rear spoiler/OEM BMW CF front splitters/OEM CF mirror covers/M Performance exhaust/H
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10-13-2009, 01:08 PM | #6 |
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Tires that much larger than stock are not a good idea for numerous reasons. I would also suggest getting the car checked out as a 4 finger gap would be 3 inches by my hand and is twice the gap of my stock car. I realize it is more than the stock RWD by a MASSIVE 1/2 inch but let's not make it seem like a SUV.
In all seriousness do a suspension change if the gap is not to your liking. Not only will it fix the visual but it will make the car more fun to drive.
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10-13-2009, 01:48 PM | #7 | |
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Simple - go to the wheel and tire forum and plug in your two tire sizes. BTW, in your first post you talked about going to a 265/40/19 tire. That would result in a 8.6% difference from stock. If the size difference is minimal, then why do you think that wheel gap would be reduced? Please re-read your original post and plug the numbers into the calculator. |
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10-13-2009, 02:01 PM | #8 | |
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Quote:
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2011 E92 M3 DCT/AW/Black Extended/Premium/Convenience/Enhanced audio/19" VMR wheels MODs:[B] OEM BMW CF rear spoiler/OEM BMW CF front splitters/OEM CF mirror covers/M Performance exhaust/H
Last edited by Dereleek; 10-13-2009 at 02:02 PM.. Reason: Left out information |
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10-14-2009, 11:49 PM | #9 |
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not going to work, you seem to not realize that the more rubber you add to the top to close the gap, the more rubber will be on the bottom between the rim and the road.
you're GAP will not decrease without shorter springs. Your ride height (ground clearance) will also skyrocket and make the car handle like shit. |
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10-15-2009, 01:17 AM | #10 |
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10-15-2009, 10:14 AM | #11 | |
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I know you want to "mind the gap" but this isn't the way to do it. |
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10-15-2009, 11:01 AM | #12 |
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Just stack as many obese people as you can into the vehicle, one in the trunk, and you are all set!
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10-15-2009, 01:09 PM | #13 | |
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Personally I don't think doing what the OP is proposing will do anything bad mechanically and it may just set the speedo at a more accurate speed. Currently they read high as it is. |
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10-15-2009, 01:26 PM | #14 |
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forget it...
now I'm fucking confused |
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10-15-2009, 02:06 PM | #15 | |
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I'm looking around for one size larger now the RFT's are almost gone. On the rear i have 255, so one size larger is pretty exactly one more 1" in diameter. With M suspension it is lowered 20mm, so i would loose 12mm of the lowering. Yes affects speedo readings by 4% or so, but the thing is off by much more than that anyway on even brandnew tyres. Someone in Germany did it with TUV approval - can't find the posting |
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