Tire Size Calculator

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Stock Sizes

  • 255/75-16

Plus Sizes

  • 255/75-16

Accepts P-Metric and Inches
/ R
/ R
225/55r18 vs 225/60r17 Tire Comparison Side By Side
  225/55-18 225/60-17 Difference
Diameter inches (mm) 27.74 (704.7) 27.63 (701.8) -0.11 (-2.9) -0.4%
Width inches (mm) 8.86 (225) 8.86 (225) 0 (0) 0%
Circum. inches (mm) 87.16 (2213.88) 86.8 (2204.77) -0.36 (-9.11) -0.4%
Sidewall Height inches (mm) 4.87 (123.75) 5.31 (135) 0.44 (11.25) 9.1%
Revolutions per mile (km) 726.93 (451.69) 729.94 (453.56) 3 (1.87) 0.4%

Speedometer Difference

Speedo Reading Actual Speed
20 mph (32.19 km/h)19.92 mph (32.05 km/h)
25 mph (40.23 km/h)24.9 mph (40.07 km/h)
30 mph (48.28 km/h)29.88 mph (48.08 km/h)
35 mph (56.33 km/h)34.86 mph (56.1 km/h)
40 mph (64.37 km/h)39.84 mph (64.11 km/h)
45 mph (72.42 km/h)44.81 mph (72.12 km/h)
50 mph (80.47 km/h)49.79 mph (80.14 km/h)
55 mph (88.51 km/h)54.77 mph (88.15 km/h)
60 mph (96.56 km/h)59.75 mph (96.16 km/h)
65 mph (104.61 km/h)64.73 mph (104.18 km/h)
70 mph (112.65 km/h)69.71 mph (112.19 km/h)
75 mph (120.7 km/h)74.69 mph (120.2 km/h)
80 mph (128.75 km/h)79.67 mph (128.22 km/h)
85 mph (136.79 km/h)84.65 mph (136.23 km/h)
90 mph (144.84 km/h)89.63 mph (144.25 km/h)
95 mph (152.89 km/h)94.61 mph (152.26 km/h)
100 mph (160.93 km/h)99.59 mph (160.27 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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