Tire Size Calculator

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Stock Sizes

  • 255/75-16

Plus Sizes

  • 255/75-16

Accepts P-Metric and Inches
/ R
/ R
395/85r20 vs 285/75r16 Tire Comparison Side By Side
  395/85-20 285/75-16 Difference
Diameter inches (mm) 46.44 (1179.5) 32.83 (833.9) -13.61 (-345.6) -29.3%
Width inches (mm) 15.55 (395) 11.22 (285) -4.33 (-110) -27.8%
Circum. inches (mm) 145.89 (3705.51) 103.14 (2619.77) -42.75 (-1085.73) -29.3%
Sidewall Height inches (mm) 13.22 (335.75) 8.42 (213.75) -4.8 (-122) -36.3%
Revolutions per mile (km) 434.31 (269.87) 614.31 (381.71) 180 (111.84) 41.4%

Speedometer Difference

Speedo Reading Actual Speed
20 mph (32.19 km/h)14.14 mph (22.76 km/h)
25 mph (40.23 km/h)17.67 mph (28.44 km/h)
30 mph (48.28 km/h)21.21 mph (34.13 km/h)
35 mph (56.33 km/h)24.74 mph (39.82 km/h)
40 mph (64.37 km/h)28.28 mph (45.51 km/h)
45 mph (72.42 km/h)31.81 mph (51.2 km/h)
50 mph (80.47 km/h)35.35 mph (56.89 km/h)
55 mph (88.51 km/h)38.88 mph (62.58 km/h)
60 mph (96.56 km/h)42.42 mph (68.27 km/h)
65 mph (104.61 km/h)45.95 mph (73.96 km/h)
70 mph (112.65 km/h)49.49 mph (79.65 km/h)
75 mph (120.7 km/h)53.02 mph (85.33 km/h)
80 mph (128.75 km/h)56.56 mph (91.02 km/h)
85 mph (136.79 km/h)60.09 mph (96.71 km/h)
90 mph (144.84 km/h)63.63 mph (102.4 km/h)
95 mph (152.89 km/h)67.16 mph (108.09 km/h)
100 mph (160.93 km/h)70.7 mph (113.78 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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