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 285/70r17 Tire Comparison Side By Side
  305/70-16 285/70-17 Difference
Diameter inches (mm) 32.81 (833.4) 32.71 (830.8) -0.1 (-2.6) -0.3%
Width inches (mm) 12.01 (305) 11.22 (285) -0.79 (-20) -6.6%
Circum. inches (mm) 103.08 (2618.2) 102.76 (2610.04) -0.32 (-8.17) -0.3%
Sidewall Height inches (mm) 8.41 (213.5) 7.85 (199.5) -0.55 (-14) -6.6%
Revolutions per mile (km) 614.67 (381.94) 616.6 (383.14) 1.92 (1.2) 0.3%

Speedometer Difference

Speedo Reading Actual Speed
20 mph (32.19 km/h)19.94 mph (32.09 km/h)
25 mph (40.23 km/h)24.92 mph (40.11 km/h)
30 mph (48.28 km/h)29.91 mph (48.13 km/h)
35 mph (56.33 km/h)34.89 mph (56.15 km/h)
40 mph (64.37 km/h)39.88 mph (64.17 km/h)
45 mph (72.42 km/h)44.86 mph (72.19 km/h)
50 mph (80.47 km/h)49.84 mph (80.22 km/h)
55 mph (88.51 km/h)54.83 mph (88.24 km/h)
60 mph (96.56 km/h)59.81 mph (96.26 km/h)
65 mph (104.61 km/h)64.8 mph (104.28 km/h)
70 mph (112.65 km/h)69.78 mph (112.3 km/h)
75 mph (120.7 km/h)74.77 mph (120.32 km/h)
80 mph (128.75 km/h)79.75 mph (128.35 km/h)
85 mph (136.79 km/h)84.73 mph (136.37 km/h)
90 mph (144.84 km/h)89.72 mph (144.39 km/h)
95 mph (152.89 km/h)94.7 mph (152.41 km/h)
100 mph (160.93 km/h)99.69 mph (160.43 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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