Tire Size Calculator

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Stock Sizes

  • 255/75-16

Plus Sizes

  • 255/75-16

Accepts P-Metric and Inches
/ R
/ R
305/70r16 vs 285/75r16 Tire Comparison Side By Side
  305/70-16 285/75-16 Difference
Diameter inches (mm) 32.81 (833.4) 32.83 (833.9) 0.02 (0.5) 0.1%
Width inches (mm) 12.01 (305) 11.22 (285) -0.79 (-20) -6.6%
Circum. inches (mm) 103.08 (2618.2) 103.14 (2619.77) 0.06 (1.57) 0.1%
Sidewall Height inches (mm) 8.41 (213.5) 8.42 (213.75) 0.01 (0.25) 0.1%
Revolutions per mile (km) 614.67 (381.94) 614.31 (381.71) -0.37 (-0.23) -0.1%

Speedometer Difference

Speedo Reading Actual Speed
20 mph (32.19 km/h)20.01 mph (32.21 km/h)
25 mph (40.23 km/h)25.01 mph (40.26 km/h)
30 mph (48.28 km/h)30.02 mph (48.31 km/h)
35 mph (56.33 km/h)35.02 mph (56.36 km/h)
40 mph (64.37 km/h)40.02 mph (64.41 km/h)
45 mph (72.42 km/h)45.03 mph (72.46 km/h)
50 mph (80.47 km/h)50.03 mph (80.52 km/h)
55 mph (88.51 km/h)55.03 mph (88.57 km/h)
60 mph (96.56 km/h)60.04 mph (96.62 km/h)
65 mph (104.61 km/h)65.04 mph (104.67 km/h)
70 mph (112.65 km/h)70.04 mph (112.72 km/h)
75 mph (120.7 km/h)75.04 mph (120.77 km/h)
80 mph (128.75 km/h)80.05 mph (128.83 km/h)
85 mph (136.79 km/h)85.05 mph (136.88 km/h)
90 mph (144.84 km/h)90.05 mph (144.93 km/h)
95 mph (152.89 km/h)95.06 mph (152.98 km/h)
100 mph (160.93 km/h)100.06 mph (161.03 km/h)

Gear Ratio / RPMs for New Tire (@ 65 mph)
2.35 2.73 2.94 3.07 3.21 3.31 3.42 3.55 3.73 3.91 4.11 4.27 4.56 4.88 5.13 5.29 5.38 5.71 6.17 7.17
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