Tire Size Calculator

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Stock Sizes

  • 255/75-16

Plus Sizes

  • 255/75-16

Accepts P-Metric and Inches
/ R
/ R
200/55r18 vs 270/55r18 Tire Comparison Side By Side
  200/55-18 270/55-18 Difference
Diameter inches (mm) 26.66 (677.2) 29.69 (754.2) 3.03 (77) 11.4%
Width inches (mm) 7.87 (200) 10.63 (270) 2.76 (70) 35%
Circum. inches (mm) 83.76 (2127.49) 93.28 (2369.39) 9.52 (241.9) 11.4%
Sidewall Height inches (mm) 4.33 (110) 5.85 (148.5) 1.52 (38.5) 35%
Revolutions per mile (km) 756.45 (470.04) 679.22 (422.05) -77.23 (-47.99) -10.2%

Speedometer Difference

Speedo Reading Actual Speed
20 mph (32.19 km/h)22.27 mph (35.85 km/h)
25 mph (40.23 km/h)27.84 mph (44.81 km/h)
30 mph (48.28 km/h)33.41 mph (53.77 km/h)
35 mph (56.33 km/h)38.98 mph (62.73 km/h)
40 mph (64.37 km/h)44.55 mph (71.69 km/h)
45 mph (72.42 km/h)50.12 mph (80.66 km/h)
50 mph (80.47 km/h)55.69 mph (89.62 km/h)
55 mph (88.51 km/h)61.25 mph (98.58 km/h)
60 mph (96.56 km/h)66.82 mph (107.54 km/h)
65 mph (104.61 km/h)72.39 mph (116.5 km/h)
70 mph (112.65 km/h)77.96 mph (125.46 km/h)
75 mph (120.7 km/h)83.53 mph (134.43 km/h)
80 mph (128.75 km/h)89.1 mph (143.39 km/h)
85 mph (136.79 km/h)94.66 mph (152.35 km/h)
90 mph (144.84 km/h)100.23 mph (161.31 km/h)
95 mph (152.89 km/h)105.8 mph (170.27 km/h)
100 mph (160.93 km/h)111.37 mph (179.23 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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