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      09-27-2015, 02:26 PM   #1
grboggs
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Wheel Size

With the swapping of the wheel sizes that I read about, doesn't
that effect your speedometer read outs. I see a lot of guys will go from a 17 inch to a 19 inch. How does that effect the speedometer?
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      09-27-2015, 02:41 PM   #2
paris1
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As log as you adjust the tire section width with the increase/decrease in wheel size so that the resulting overall diameter of the tire remains the same, the speedo/odo calibration will not be affected.
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      09-27-2015, 03:46 PM   #3
grboggs
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Wow, so you would have to go with a much lower profile tire to lets say go with a 18 or 19 inch wheel. I can't imagine how rough a ride that would be.
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      09-27-2015, 05:05 PM   #4
paris1
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Yep, that's always the disadvantage of upsizing wheels and that's why some Z4s with 19s have ended up with cracked wheels, especially when combined with more inherently rough riding run flat tires.
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      09-28-2015, 08:07 AM   #5
Squddie
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Quote:
Originally Posted by grboggs View Post
Wow, so you would have to go with a much lower profile tire to lets say go with a 18 or 19 inch wheel. I can't imagine how rough a ride that would be.
Yeah but it adds steering/turning precision.

And lower profile good tires run softer than the higher profile runflat nonsense.
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      09-28-2015, 08:13 AM   #6
rking117
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You can also have the ECU programmed with the new wheel size and it will auto correct for the size. Plus if you decide to not get the ECU updated i have seen where some vehicles (like my 3er) will throw a cruise control malfunction. Simply adding the new tire size fixed it.
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