Tire Size Calculator

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Stock Sizes

  • 255/75-16

Plus Sizes

  • 255/75-16

Accepts P-Metric and Inches
/ R
/ R
200/50r18 vs 180/55r18 Tire Comparison Side By Side
  200/50-18 180/55-18 Difference
Diameter inches (mm) 25.87 (657.2) 25.8 (655.2) -0.08 (-2) -0.3%
Width inches (mm) 7.87 (200) 7.09 (180) -0.79 (-20) -10%
Circum. inches (mm) 81.29 (2064.65) 81.04 (2058.37) -0.25 (-6.28) -0.3%
Sidewall Height inches (mm) 3.94 (100) 3.9 (99) -0.04 (-1) -1%
Revolutions per mile (km) 779.47 (484.34) 781.85 (485.82) 2.38 (1.48) 0.3%

Speedometer Difference

Speedo Reading Actual Speed
20 mph (32.19 km/h)19.94 mph (32.09 km/h)
25 mph (40.23 km/h)24.92 mph (40.11 km/h)
30 mph (48.28 km/h)29.91 mph (48.13 km/h)
35 mph (56.33 km/h)34.89 mph (56.16 km/h)
40 mph (64.37 km/h)39.88 mph (64.18 km/h)
45 mph (72.42 km/h)44.86 mph (72.2 km/h)
50 mph (80.47 km/h)49.85 mph (80.22 km/h)
55 mph (88.51 km/h)54.83 mph (88.24 km/h)
60 mph (96.56 km/h)59.82 mph (96.27 km/h)
65 mph (104.61 km/h)64.8 mph (104.29 km/h)
70 mph (112.65 km/h)69.79 mph (112.31 km/h)
75 mph (120.7 km/h)74.77 mph (120.33 km/h)
80 mph (128.75 km/h)79.76 mph (128.36 km/h)
85 mph (136.79 km/h)84.74 mph (136.38 km/h)
90 mph (144.84 km/h)89.73 mph (144.4 km/h)
95 mph (152.89 km/h)94.71 mph (152.42 km/h)
100 mph (160.93 km/h)99.7 mph (160.44 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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