Tire Size Calculator

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Stock Sizes

  • 255/75-16

Plus Sizes

  • 255/75-16

Accepts P-Metric and Inches
/ R
/ R
255/55r20 vs 285/55r20 Tire Comparison Side By Side
  255/55-20 285/55-20 Difference
Diameter inches (mm) 31.04 (788.5) 32.34 (821.5) 1.3 (33) 4.2%
Width inches (mm) 10.04 (255) 11.22 (285) 1.18 (30) 11.8%
Circum. inches (mm) 97.53 (2477.15) 101.61 (2580.82) 4.08 (103.67) 4.2%
Sidewall Height inches (mm) 5.52 (140.25) 6.17 (156.75) 0.65 (16.5) 11.8%
Revolutions per mile (km) 649.68 (403.69) 623.58 (387.47) -26.1 (-16.22) -4%

Speedometer Difference

Speedo Reading Actual Speed
20 mph (32.19 km/h)20.84 mph (33.53 km/h)
25 mph (40.23 km/h)26.05 mph (41.92 km/h)
30 mph (48.28 km/h)31.26 mph (50.3 km/h)
35 mph (56.33 km/h)36.46 mph (58.68 km/h)
40 mph (64.37 km/h)41.67 mph (67.07 km/h)
45 mph (72.42 km/h)46.88 mph (75.45 km/h)
50 mph (80.47 km/h)52.09 mph (83.84 km/h)
55 mph (88.51 km/h)57.3 mph (92.22 km/h)
60 mph (96.56 km/h)62.51 mph (100.6 km/h)
65 mph (104.61 km/h)67.72 mph (108.99 km/h)
70 mph (112.65 km/h)72.93 mph (117.37 km/h)
75 mph (120.7 km/h)78.14 mph (125.75 km/h)
80 mph (128.75 km/h)83.35 mph (134.14 km/h)
85 mph (136.79 km/h)88.56 mph (142.52 km/h)
90 mph (144.84 km/h)93.77 mph (150.9 km/h)
95 mph (152.89 km/h)98.98 mph (159.29 km/h)
100 mph (160.93 km/h)104.19 mph (167.67 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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