Tire Size Calculator

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Stock Sizes

  • 255/75-16

Plus Sizes

  • 255/75-16

Accepts P-Metric and Inches
/ R
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395/85r20 vs 285/85r20 Tire Comparison Side By Side
  395/85-20 285/85-20 Difference
Diameter inches (mm) 46.44 (1179.5) 39.07 (992.5) -7.36 (-187) -15.9%
Width inches (mm) 15.55 (395) 11.22 (285) -4.33 (-110) -27.8%
Circum. inches (mm) 145.89 (3705.51) 122.76 (3118.03) -23.13 (-587.48) -15.9%
Sidewall Height inches (mm) 13.22 (335.75) 9.54 (242.25) -3.68 (-93.5) -27.8%
Revolutions per mile (km) 434.31 (269.87) 516.14 (320.71) 81.83 (50.85) 18.8%

Speedometer Difference

Speedo Reading Actual Speed
20 mph (32.19 km/h)16.83 mph (27.08 km/h)
25 mph (40.23 km/h)21.04 mph (33.85 km/h)
30 mph (48.28 km/h)25.24 mph (40.63 km/h)
35 mph (56.33 km/h)29.45 mph (47.4 km/h)
40 mph (64.37 km/h)33.66 mph (54.17 km/h)
45 mph (72.42 km/h)37.87 mph (60.94 km/h)
50 mph (80.47 km/h)42.07 mph (67.71 km/h)
55 mph (88.51 km/h)46.28 mph (74.48 km/h)
60 mph (96.56 km/h)50.49 mph (81.25 km/h)
65 mph (104.61 km/h)54.69 mph (88.02 km/h)
70 mph (112.65 km/h)58.9 mph (94.79 km/h)
75 mph (120.7 km/h)63.11 mph (101.56 km/h)
80 mph (128.75 km/h)67.32 mph (108.34 km/h)
85 mph (136.79 km/h)71.52 mph (115.11 km/h)
90 mph (144.84 km/h)75.73 mph (121.88 km/h)
95 mph (152.89 km/h)79.94 mph (128.65 km/h)
100 mph (160.93 km/h)84.15 mph (135.42 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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