Tire Size Calculator

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Stock Sizes

  • 255/75-16

Plus Sizes

  • 255/75-16

Accepts P-Metric and Inches
/ R
/ R
445/50r22.5 vs 275/70r22.5 Tire Comparison Side By Side
  445/50-22.5 275/70-22.5 Difference
Diameter inches (mm) 40.02 (1016.5) 37.66 (956.5) -2.36 (-60) -5.9%
Width inches (mm) 17.52 (445) 10.83 (275) -6.69 (-170) -38.2%
Circum. inches (mm) 125.73 (3193.43) 118.3 (3004.93) -7.42 (-188.5) -5.9%
Sidewall Height inches (mm) 8.76 (222.5) 7.58 (192.5) -1.18 (-30) -13.5%
Revolutions per mile (km) 503.95 (313.14) 535.57 (332.79) 31.61 (19.64) 6.3%

Speedometer Difference

Speedo Reading Actual Speed
20 mph (32.19 km/h)18.82 mph (30.29 km/h)
25 mph (40.23 km/h)23.52 mph (37.86 km/h)
30 mph (48.28 km/h)28.23 mph (45.43 km/h)
35 mph (56.33 km/h)32.93 mph (53 km/h)
40 mph (64.37 km/h)37.64 mph (60.57 km/h)
45 mph (72.42 km/h)42.34 mph (68.15 km/h)
50 mph (80.47 km/h)47.05 mph (75.72 km/h)
55 mph (88.51 km/h)51.75 mph (83.29 km/h)
60 mph (96.56 km/h)56.46 mph (90.86 km/h)
65 mph (104.61 km/h)61.16 mph (98.43 km/h)
70 mph (112.65 km/h)65.87 mph (106 km/h)
75 mph (120.7 km/h)70.57 mph (113.58 km/h)
80 mph (128.75 km/h)75.28 mph (121.15 km/h)
85 mph (136.79 km/h)79.98 mph (128.72 km/h)
90 mph (144.84 km/h)84.69 mph (136.29 km/h)
95 mph (152.89 km/h)89.39 mph (143.86 km/h)
100 mph (160.93 km/h)94.1 mph (151.44 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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