Tire Size Calculator

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Stock Sizes

  • 255/75-16

Plus Sizes

  • 255/75-16

Accepts P-Metric and Inches
/ R
/ R
285/75r17 vs 285/70r18 Tire Comparison Side By Side
  285/75-17 285/70-18 Difference
Diameter inches (mm) 33.83 (859.3) 33.71 (856.2) -0.12 (-3.1) -0.4%
Width inches (mm) 11.22 (285) 11.22 (285) 0 (0) 0%
Circum. inches (mm) 106.28 (2699.57) 105.9 (2689.83) -0.38 (-9.74) -0.4%
Sidewall Height inches (mm) 8.42 (213.75) 7.85 (199.5) -0.56 (-14.25) -6.7%
Revolutions per mile (km) 596.15 (370.43) 598.31 (371.77) 2.16 (1.34) 0.4%

Speedometer Difference

Speedo Reading Actual Speed
20 mph (32.19 km/h)19.93 mph (32.07 km/h)
25 mph (40.23 km/h)24.91 mph (40.09 km/h)
30 mph (48.28 km/h)29.89 mph (48.11 km/h)
35 mph (56.33 km/h)34.87 mph (56.12 km/h)
40 mph (64.37 km/h)39.86 mph (64.14 km/h)
45 mph (72.42 km/h)44.84 mph (72.16 km/h)
50 mph (80.47 km/h)49.82 mph (80.18 km/h)
55 mph (88.51 km/h)54.8 mph (88.19 km/h)
60 mph (96.56 km/h)59.78 mph (96.21 km/h)
65 mph (104.61 km/h)64.77 mph (104.23 km/h)
70 mph (112.65 km/h)69.75 mph (112.25 km/h)
75 mph (120.7 km/h)74.73 mph (120.27 km/h)
80 mph (128.75 km/h)79.71 mph (128.28 km/h)
85 mph (136.79 km/h)84.69 mph (136.3 km/h)
90 mph (144.84 km/h)89.68 mph (144.32 km/h)
95 mph (152.89 km/h)94.66 mph (152.34 km/h)
100 mph (160.93 km/h)99.64 mph (160.35 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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