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 205/60r18 Tire Comparison Side By Side
  200/50-18 205/60-18 Difference
Diameter inches (mm) 25.87 (657.2) 27.69 (703.2) 1.81 (46) 7%
Width inches (mm) 7.87 (200) 8.07 (205) 0.2 (5) 2.5%
Circum. inches (mm) 81.29 (2064.65) 86.98 (2209.17) 5.69 (144.51) 7%
Sidewall Height inches (mm) 3.94 (100) 4.84 (123) 0.91 (23) 23%
Revolutions per mile (km) 779.47 (484.34) 728.48 (452.66) -50.99 (-31.68) -6.5%

Speedometer Difference

Speedo Reading Actual Speed
20 mph (32.19 km/h)21.4 mph (34.44 km/h)
25 mph (40.23 km/h)26.75 mph (43.05 km/h)
30 mph (48.28 km/h)32.1 mph (51.66 km/h)
35 mph (56.33 km/h)37.45 mph (60.27 km/h)
40 mph (64.37 km/h)42.8 mph (68.88 km/h)
45 mph (72.42 km/h)48.15 mph (77.49 km/h)
50 mph (80.47 km/h)53.5 mph (86.1 km/h)
55 mph (88.51 km/h)58.85 mph (94.71 km/h)
60 mph (96.56 km/h)64.2 mph (103.32 km/h)
65 mph (104.61 km/h)69.55 mph (111.93 km/h)
70 mph (112.65 km/h)74.9 mph (120.54 km/h)
75 mph (120.7 km/h)80.25 mph (129.15 km/h)
80 mph (128.75 km/h)85.6 mph (137.76 km/h)
85 mph (136.79 km/h)90.95 mph (146.37 km/h)
90 mph (144.84 km/h)96.3 mph (154.98 km/h)
95 mph (152.89 km/h)101.65 mph (163.59 km/h)
100 mph (160.93 km/h)107 mph (172.2 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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