Quote:
Originally Posted by tjlazer
Well in most cases the tire diameter is smaller. Like with a 305/30/19, it's smaller than a 285/35/19. Over 2 inches smaller! Throws off the speedometer too.
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a switch from a 285/35/19 to a 305/30/19 will create a 2.4% increase in speedo reading. so when you speedo reads 60, you're actually going 58.5. Nothing major.
and the difference is no where near 2 inches...
.............285 305
Sidewall 3.9" 3.6"
Diameter 26.9" 26.2"