Tire Size Calculator

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Stock Sizes

  • 255/75-16

Plus Sizes

  • 255/75-16

Accepts P-Metric and Inches
/ R
/ R
35/12.5r18 vs 285/75r18 Tire Comparison Side By Side
  35/12.5-18 285/75-18 Difference
Diameter inches (mm) 35.03 (889.68) 34.83 (884.7) -0.2 (-4.98) -0.6%
Width inches (mm) 12.52 (318) 11.22 (285) -1.3 (-33) -10.4%
Circum. inches (mm) 110.04 (2795.01) 109.42 (2779.37) -0.62 (-15.65) -0.6%
Sidewall Height inches (mm) 8.51 (216.24) 8.42 (213.75) -0.1 (-2.49) -1.2%
Revolutions per mile (km) 575.79 (357.78) 579.03 (359.79) 3.24 (2.01) 0.6%

Speedometer Difference

Speedo Reading Actual Speed
20 mph (32.19 km/h)19.89 mph (32.01 km/h)
25 mph (40.23 km/h)24.86 mph (40.01 km/h)
30 mph (48.28 km/h)29.83 mph (48.01 km/h)
35 mph (56.33 km/h)34.8 mph (56.01 km/h)
40 mph (64.37 km/h)39.78 mph (64.01 km/h)
45 mph (72.42 km/h)44.75 mph (72.02 km/h)
50 mph (80.47 km/h)49.72 mph (80.02 km/h)
55 mph (88.51 km/h)54.69 mph (88.02 km/h)
60 mph (96.56 km/h)59.66 mph (96.02 km/h)
65 mph (104.61 km/h)64.64 mph (104.02 km/h)
70 mph (112.65 km/h)69.61 mph (112.02 km/h)
75 mph (120.7 km/h)74.58 mph (120.03 km/h)
80 mph (128.75 km/h)79.55 mph (128.03 km/h)
85 mph (136.79 km/h)84.52 mph (136.03 km/h)
90 mph (144.84 km/h)89.5 mph (144.03 km/h)
95 mph (152.89 km/h)94.47 mph (152.03 km/h)
100 mph (160.93 km/h)99.44 mph (160.03 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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