Tire Size Calculator

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Stock Sizes

  • 255/75-16

Plus Sizes

  • 255/75-16

Accepts P-Metric and Inches
/ R
/ R
135/80r18 vs 225/55r18 Tire Comparison Side By Side
  135/80-18 225/55-18 Difference
Diameter inches (mm) 26.5 (673.2) 27.74 (704.7) 1.24 (31.5) 4.7%
Width inches (mm) 5.31 (135) 8.86 (225) 3.54 (90) 66.7%
Circum. inches (mm) 83.26 (2114.92) 87.16 (2213.88) 3.9 (98.96) 4.7%
Sidewall Height inches (mm) 4.25 (108) 4.87 (123.75) 0.62 (15.75) 14.6%
Revolutions per mile (km) 760.95 (472.83) 726.93 (451.69) -34.01 (-21.14) -4.5%

Speedometer Difference

Speedo Reading Actual Speed
20 mph (32.19 km/h)20.94 mph (33.69 km/h)
25 mph (40.23 km/h)26.17 mph (42.12 km/h)
30 mph (48.28 km/h)31.4 mph (50.54 km/h)
35 mph (56.33 km/h)36.64 mph (58.96 km/h)
40 mph (64.37 km/h)41.87 mph (67.39 km/h)
45 mph (72.42 km/h)47.11 mph (75.81 km/h)
50 mph (80.47 km/h)52.34 mph (84.23 km/h)
55 mph (88.51 km/h)57.57 mph (92.66 km/h)
60 mph (96.56 km/h)62.81 mph (101.08 km/h)
65 mph (104.61 km/h)68.04 mph (109.5 km/h)
70 mph (112.65 km/h)73.28 mph (117.93 km/h)
75 mph (120.7 km/h)78.51 mph (126.35 km/h)
80 mph (128.75 km/h)83.74 mph (134.77 km/h)
85 mph (136.79 km/h)88.98 mph (143.2 km/h)
90 mph (144.84 km/h)94.21 mph (151.62 km/h)
95 mph (152.89 km/h)99.45 mph (160.04 km/h)
100 mph (160.93 km/h)104.68 mph (168.47 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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