Tired of searching. What calculations are used to determine actual speed and mpg when running 285/75/16's? I know I need the speedo correction gear from Slee, but in the mean time I'd like to know what my numbers are.
"The most common size tire installed to gain extra clearance is 285/75R16. When the diameter of this tire is calculated, it comes to 32.8". The stock tire size is 275/70R16, which equated to a 31.2" diameter. So when installed the larger tires, your speedometer will read 57 mph when you are traveling 60 mph. Using the correction gear, your speedometer will read 58.9 mph."