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16 to 15 holies = speedometer difference?

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Old Aug 27, 2020 | 10:42 AM
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frankiev
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16 to 15 holies = speedometer difference?

Im going from 205 55 16s to 205 55 15s any math wizards know how much my speedo will be off ?
 
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Old Aug 27, 2020 | 10:54 AM
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I like the calculator on this site:
https://www.wheel-size.com/calc/

Plug in your starting wheel and tire package, plug in the comparison package, and it tells you the differences.
 
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Old Aug 27, 2020 | 10:59 AM
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Speedo will run 4.2% faster in the 205/55/15
compared to 205/55/16. Difference of
about 2.5 mph at 60 mph.
Those 16s are a bit taller than stock, and
those 15s are slightly shorter.
 
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Old Aug 27, 2020 | 11:41 AM
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frankiev
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Thank you
 
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