Tire Size Calculator

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Stock Sizes

  • 255/75-16

Plus Sizes

  • 255/75-16

Accepts P-Metric and Inches
/ R
/ R
265/55r20 vs 285/55r20 Tire Comparison Side By Side
  265/55-20 285/55-20 Difference
Diameter inches (mm) 31.48 (799.5) 32.34 (821.5) 0.87 (22) 2.8%
Width inches (mm) 10.43 (265) 11.22 (285) 0.79 (20) 7.5%
Circum. inches (mm) 98.89 (2511.7) 101.61 (2580.82) 2.72 (69.12) 2.8%
Sidewall Height inches (mm) 5.74 (145.75) 6.17 (156.75) 0.43 (11) 7.5%
Revolutions per mile (km) 640.74 (398.14) 623.58 (387.47) -17.16 (-10.66) -2.7%

Speedometer Difference

Speedo Reading Actual Speed
20 mph (32.19 km/h)20.55 mph (33.07 km/h)
25 mph (40.23 km/h)25.69 mph (41.34 km/h)
30 mph (48.28 km/h)30.83 mph (49.61 km/h)
35 mph (56.33 km/h)35.96 mph (57.88 km/h)
40 mph (64.37 km/h)41.1 mph (66.15 km/h)
45 mph (72.42 km/h)46.24 mph (74.41 km/h)
50 mph (80.47 km/h)51.38 mph (82.68 km/h)
55 mph (88.51 km/h)56.51 mph (90.95 km/h)
60 mph (96.56 km/h)61.65 mph (99.22 km/h)
65 mph (104.61 km/h)66.79 mph (107.49 km/h)
70 mph (112.65 km/h)71.93 mph (115.75 km/h)
75 mph (120.7 km/h)77.06 mph (124.02 km/h)
80 mph (128.75 km/h)82.2 mph (132.29 km/h)
85 mph (136.79 km/h)87.34 mph (140.56 km/h)
90 mph (144.84 km/h)92.48 mph (148.83 km/h)
95 mph (152.89 km/h)97.61 mph (157.1 km/h)
100 mph (160.93 km/h)102.75 mph (165.36 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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