Tire Size Calculator

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Stock Sizes

  • 255/75-16

Plus Sizes

  • 255/75-16

Accepts P-Metric and Inches
/ R
/ R
445/65r22.5 vs 365/75r22.5 Tire Comparison Side By Side
  445/65-22.5 365/75-22.5 Difference
Diameter inches (mm) 45.28 (1150) 44.06 (1119) -1.22 (-31) -2.7%
Width inches (mm) 17.52 (445) 14.37 (365) -3.15 (-80) -18%
Circum. inches (mm) 142.24 (3612.83) 138.4 (3515.44) -3.83 (-97.39) -2.7%
Sidewall Height inches (mm) 11.39 (289.25) 10.78 (273.75) -0.61 (-15.5) -5.4%
Revolutions per mile (km) 445.45 (276.79) 457.79 (284.46) 12.34 (7.67) 2.8%

Speedometer Difference

Speedo Reading Actual Speed
20 mph (32.19 km/h)19.46 mph (31.32 km/h)
25 mph (40.23 km/h)24.33 mph (39.15 km/h)
30 mph (48.28 km/h)29.19 mph (46.98 km/h)
35 mph (56.33 km/h)34.06 mph (54.81 km/h)
40 mph (64.37 km/h)38.92 mph (62.64 km/h)
45 mph (72.42 km/h)43.79 mph (70.47 km/h)
50 mph (80.47 km/h)48.65 mph (78.3 km/h)
55 mph (88.51 km/h)53.52 mph (86.13 km/h)
60 mph (96.56 km/h)58.38 mph (93.96 km/h)
65 mph (104.61 km/h)63.25 mph (101.79 km/h)
70 mph (112.65 km/h)68.11 mph (109.62 km/h)
75 mph (120.7 km/h)72.98 mph (117.45 km/h)
80 mph (128.75 km/h)77.84 mph (125.28 km/h)
85 mph (136.79 km/h)82.71 mph (133.11 km/h)
90 mph (144.84 km/h)87.57 mph (140.94 km/h)
95 mph (152.89 km/h)92.44 mph (148.77 km/h)
100 mph (160.93 km/h)97.3 mph (156.6 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
0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0
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