Tire Size Calculator

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Stock Sizes

  • 255/75-16

Plus Sizes

  • 255/75-16

Accepts P-Metric and Inches
/ R
/ R
285/45r18 vs 245/50r18 Tire Comparison Side By Side
  285/45-18 245/50-18 Difference
Diameter inches (mm) 28.1 (713.7) 27.65 (702.2) -0.45 (-11.5) -1.6%
Width inches (mm) 11.22 (285) 9.65 (245) -1.57 (-40) -14%
Circum. inches (mm) 88.27 (2242.15) 86.85 (2206.03) -1.42 (-36.13) -1.6%
Sidewall Height inches (mm) 5.05 (128.25) 4.82 (122.5) -0.23 (-5.75) -4.5%
Revolutions per mile (km) 717.77 (446) 729.52 (453.3) 11.75 (7.3) 1.6%

Speedometer Difference

Speedo Reading Actual Speed
20 mph (32.19 km/h)19.68 mph (31.67 km/h)
25 mph (40.23 km/h)24.6 mph (39.59 km/h)
30 mph (48.28 km/h)29.52 mph (47.5 km/h)
35 mph (56.33 km/h)34.44 mph (55.42 km/h)
40 mph (64.37 km/h)39.36 mph (63.34 km/h)
45 mph (72.42 km/h)44.27 mph (71.25 km/h)
50 mph (80.47 km/h)49.19 mph (79.17 km/h)
55 mph (88.51 km/h)54.11 mph (87.09 km/h)
60 mph (96.56 km/h)59.03 mph (95 km/h)
65 mph (104.61 km/h)63.95 mph (102.92 km/h)
70 mph (112.65 km/h)68.87 mph (110.84 km/h)
75 mph (120.7 km/h)73.79 mph (118.76 km/h)
80 mph (128.75 km/h)78.71 mph (126.67 km/h)
85 mph (136.79 km/h)83.63 mph (134.59 km/h)
90 mph (144.84 km/h)88.55 mph (142.51 km/h)
95 mph (152.89 km/h)93.47 mph (150.42 km/h)
100 mph (160.93 km/h)98.39 mph (158.34 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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