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 275/45r18 Tire Comparison Side By Side
  285/45-18 275/45-18 Difference
Diameter inches (mm) 28.1 (713.7) 27.74 (704.7) -0.35 (-9) -1.3%
Width inches (mm) 11.22 (285) 10.83 (275) -0.39 (-10) -3.5%
Circum. inches (mm) 88.27 (2242.15) 87.16 (2213.88) -1.11 (-28.27) -1.3%
Sidewall Height inches (mm) 5.05 (128.25) 4.87 (123.75) -0.18 (-4.5) -3.5%
Revolutions per mile (km) 717.77 (446) 726.93 (451.69) 9.17 (5.7) 1.3%

Speedometer Difference

Speedo Reading Actual Speed
20 mph (32.19 km/h)19.75 mph (31.78 km/h)
25 mph (40.23 km/h)24.68 mph (39.73 km/h)
30 mph (48.28 km/h)29.62 mph (47.67 km/h)
35 mph (56.33 km/h)34.56 mph (55.62 km/h)
40 mph (64.37 km/h)39.5 mph (63.56 km/h)
45 mph (72.42 km/h)44.43 mph (71.51 km/h)
50 mph (80.47 km/h)49.37 mph (79.45 km/h)
55 mph (88.51 km/h)54.31 mph (87.4 km/h)
60 mph (96.56 km/h)59.24 mph (95.34 km/h)
65 mph (104.61 km/h)64.18 mph (103.29 km/h)
70 mph (112.65 km/h)69.12 mph (111.23 km/h)
75 mph (120.7 km/h)74.05 mph (119.18 km/h)
80 mph (128.75 km/h)78.99 mph (127.12 km/h)
85 mph (136.79 km/h)83.93 mph (135.07 km/h)
90 mph (144.84 km/h)88.87 mph (143.01 km/h)
95 mph (152.89 km/h)93.8 mph (150.96 km/h)
100 mph (160.93 km/h)98.74 mph (158.91 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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