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 35/12.5r20 Tire Comparison Side By Side
  395/85-20 35/12.5-20 Difference
Diameter inches (mm) 46.44 (1179.5) 35.02 (889.6) -11.41 (-289.9) -24.6%
Width inches (mm) 15.55 (395) 12.52 (318) -3.03 (-77) -19.5%
Circum. inches (mm) 145.89 (3705.51) 110.03 (2794.76) -35.86 (-910.75) -24.6%
Sidewall Height inches (mm) 13.22 (335.75) 7.51 (190.8) -5.71 (-144.95) -43.2%
Revolutions per mile (km) 434.31 (269.87) 575.84 (357.81) 141.53 (87.94) 32.6%

Speedometer Difference

Speedo Reading Actual Speed
20 mph (32.19 km/h)15.08 mph (24.28 km/h)
25 mph (40.23 km/h)18.86 mph (30.34 km/h)
30 mph (48.28 km/h)22.63 mph (36.41 km/h)
35 mph (56.33 km/h)26.4 mph (42.48 km/h)
40 mph (64.37 km/h)30.17 mph (48.55 km/h)
45 mph (72.42 km/h)33.94 mph (54.62 km/h)
50 mph (80.47 km/h)37.71 mph (60.69 km/h)
55 mph (88.51 km/h)41.48 mph (66.76 km/h)
60 mph (96.56 km/h)45.25 mph (72.83 km/h)
65 mph (104.61 km/h)49.02 mph (78.9 km/h)
70 mph (112.65 km/h)52.8 mph (84.97 km/h)
75 mph (120.7 km/h)56.57 mph (91.03 km/h)
80 mph (128.75 km/h)60.34 mph (97.1 km/h)
85 mph (136.79 km/h)64.11 mph (103.17 km/h)
90 mph (144.84 km/h)67.88 mph (109.24 km/h)
95 mph (152.89 km/h)71.65 mph (115.31 km/h)
100 mph (160.93 km/h)75.42 mph (121.38 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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