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 295/85r15 Tire Comparison Side By Side
  395/85-20 295/85-15 Difference
Diameter inches (mm) 46.44 (1179.5) 34.74 (882.5) -11.69 (-297) -25.2%
Width inches (mm) 15.55 (395) 11.61 (295) -3.94 (-100) -25.3%
Circum. inches (mm) 145.89 (3705.51) 109.15 (2772.46) -36.73 (-933.05) -25.2%
Sidewall Height inches (mm) 13.22 (335.75) 9.87 (250.75) -3.35 (-85) -25.3%
Revolutions per mile (km) 434.31 (269.87) 580.48 (360.69) 146.16 (90.82) 33.7%

Speedometer Difference

Speedo Reading Actual Speed
20 mph (32.19 km/h)14.96 mph (24.08 km/h)
25 mph (40.23 km/h)18.7 mph (30.1 km/h)
30 mph (48.28 km/h)22.45 mph (36.12 km/h)
35 mph (56.33 km/h)26.19 mph (42.14 km/h)
40 mph (64.37 km/h)29.93 mph (48.16 km/h)
45 mph (72.42 km/h)33.67 mph (54.18 km/h)
50 mph (80.47 km/h)37.41 mph (60.21 km/h)
55 mph (88.51 km/h)41.15 mph (66.23 km/h)
60 mph (96.56 km/h)44.89 mph (72.25 km/h)
65 mph (104.61 km/h)48.63 mph (78.27 km/h)
70 mph (112.65 km/h)52.37 mph (84.29 km/h)
75 mph (120.7 km/h)56.11 mph (90.31 km/h)
80 mph (128.75 km/h)59.86 mph (96.33 km/h)
85 mph (136.79 km/h)63.6 mph (102.35 km/h)
90 mph (144.84 km/h)67.34 mph (108.37 km/h)
95 mph (152.89 km/h)71.08 mph (114.39 km/h)
100 mph (160.93 km/h)74.82 mph (120.41 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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