Speed adjustment
#12
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#13
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the overall circumference of a 245/40/18 and the 275/30/19 or 245/35/19 are pretty much the same, it's not going to affect your speedo readout...i would think your little 3rd party device that relies on whatever technology (gps etc) is off. Besides does 1-4 mph really matter?
I had the same 123's stock and have had the same 19" tires as well...there isn't a difference, and if so so slight that I could care less
I had the same 123's stock and have had the same 19" tires as well...there isn't a difference, and if so so slight that I could care less
#14
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My Ride: /// 2006 | 530I | Silver Gray Metallic | Sport / Prem / Navi / IPod | LCI EURO SPEC Tail's | LED Licence plate bulbs | LED side turn indicators | Roof Spoiler MORE TO COME!!!!
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The difference is of course not that important or noticeable. It however is always good to know. Like you guys said the larger the tire/rim combo the slower it should go. That's the reason I asked this to see if there was another underlying cause. Which seems like its common to have stock/OEM options on the 5'ers ranging from 17" to 19"...
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#15
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I think the general "rule of thumb" I have always heard still rings true: If the overall rolling diameter of the replacement wheel/tire combo is within 3% of stock there should be no noticeable difference or need to adjust the speedo.
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