Tire Size Calculator

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Stock Sizes

  • 255/75-16

Plus Sizes

  • 255/75-16

Accepts P-Metric and Inches
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35/12.5r20 vs 275/60r20 Tire Comparison Side By Side
  35/12.5-20 275/60-20 Difference
Diameter inches (mm) 35.02 (889.6) 32.99 (838) -2.03 (-51.6) -5.8%
Width inches (mm) 12.52 (318) 10.83 (275) -1.69 (-43) -13.5%
Circum. inches (mm) 110.03 (2794.76) 103.65 (2632.65) -6.38 (-162.11) -5.8%
Sidewall Height inches (mm) 7.51 (190.8) 6.5 (165) -1.02 (-25.8) -13.5%
Revolutions per mile (km) 575.84 (357.81) 611.3 (379.84) 35.46 (22.03) 6.2%

Speedometer Difference

Speedo Reading Actual Speed
20 mph (32.19 km/h)18.84 mph (30.32 km/h)
25 mph (40.23 km/h)23.55 mph (37.9 km/h)
30 mph (48.28 km/h)28.26 mph (45.48 km/h)
35 mph (56.33 km/h)32.97 mph (53.06 km/h)
40 mph (64.37 km/h)37.68 mph (60.64 km/h)
45 mph (72.42 km/h)42.39 mph (68.22 km/h)
50 mph (80.47 km/h)47.1 mph (75.8 km/h)
55 mph (88.51 km/h)51.81 mph (83.38 km/h)
60 mph (96.56 km/h)56.52 mph (90.96 km/h)
65 mph (104.61 km/h)61.23 mph (98.54 km/h)
70 mph (112.65 km/h)65.94 mph (106.12 km/h)
75 mph (120.7 km/h)70.65 mph (113.7 km/h)
80 mph (128.75 km/h)75.36 mph (121.28 km/h)
85 mph (136.79 km/h)80.07 mph (128.86 km/h)
90 mph (144.84 km/h)84.78 mph (136.44 km/h)
95 mph (152.89 km/h)89.49 mph (144.02 km/h)
100 mph (160.93 km/h)94.2 mph (151.6 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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