Tire Size Calculator

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Stock Sizes

  • 255/75-16

Plus Sizes

  • 255/75-16

Accepts P-Metric and Inches
/ R
/ R
225/80r22.5 vs 225/90r22.5 Tire Comparison Side By Side
  225/80-22.5 225/90-22.5 Difference
Diameter inches (mm) 36.67 (931.5) 38.44 (976.5) 1.77 (45) 4.8%
Width inches (mm) 8.86 (225) 8.86 (225) 0 (0) 0%
Circum. inches (mm) 115.21 (2926.39) 120.78 (3067.77) 5.57 (141.37) 4.8%
Sidewall Height inches (mm) 7.09 (180) 7.97 (202.5) 0.89 (22.5) 12.5%
Revolutions per mile (km) 549.94 (341.72) 524.6 (325.97) -25.34 (-15.75) -4.6%

Speedometer Difference

Speedo Reading Actual Speed
20 mph (32.19 km/h)20.97 mph (33.74 km/h)
25 mph (40.23 km/h)26.21 mph (42.18 km/h)
30 mph (48.28 km/h)31.45 mph (50.61 km/h)
35 mph (56.33 km/h)36.69 mph (59.05 km/h)
40 mph (64.37 km/h)41.93 mph (67.48 km/h)
45 mph (72.42 km/h)47.17 mph (75.92 km/h)
50 mph (80.47 km/h)52.42 mph (84.35 km/h)
55 mph (88.51 km/h)57.66 mph (92.79 km/h)
60 mph (96.56 km/h)62.9 mph (101.23 km/h)
65 mph (104.61 km/h)68.14 mph (109.66 km/h)
70 mph (112.65 km/h)73.38 mph (118.1 km/h)
75 mph (120.7 km/h)78.62 mph (126.53 km/h)
80 mph (128.75 km/h)83.86 mph (134.97 km/h)
85 mph (136.79 km/h)89.11 mph (143.4 km/h)
90 mph (144.84 km/h)94.35 mph (151.84 km/h)
95 mph (152.89 km/h)99.59 mph (160.27 km/h)
100 mph (160.93 km/h)104.83 mph (168.71 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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