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 235/90r22.5 Tire Comparison Side By Side
  225/80-22.5 235/90-22.5 Difference
Diameter inches (mm) 36.67 (931.5) 39.15 (994.5) 2.48 (63) 6.8%
Width inches (mm) 8.86 (225) 9.25 (235) 0.39 (10) 4.4%
Circum. inches (mm) 115.21 (2926.39) 123 (3124.31) 7.79 (197.92) 6.8%
Sidewall Height inches (mm) 7.09 (180) 8.33 (211.5) 1.24 (31.5) 17.5%
Revolutions per mile (km) 549.94 (341.72) 515.1 (320.07) -34.84 (-21.65) -6.3%

Speedometer Difference

Speedo Reading Actual Speed
20 mph (32.19 km/h)21.35 mph (34.36 km/h)
25 mph (40.23 km/h)26.69 mph (42.95 km/h)
30 mph (48.28 km/h)32.03 mph (51.55 km/h)
35 mph (56.33 km/h)37.37 mph (60.14 km/h)
40 mph (64.37 km/h)42.71 mph (68.73 km/h)
45 mph (72.42 km/h)48.04 mph (77.32 km/h)
50 mph (80.47 km/h)53.38 mph (85.91 km/h)
55 mph (88.51 km/h)58.72 mph (94.5 km/h)
60 mph (96.56 km/h)64.06 mph (103.09 km/h)
65 mph (104.61 km/h)69.4 mph (111.68 km/h)
70 mph (112.65 km/h)74.73 mph (120.27 km/h)
75 mph (120.7 km/h)80.07 mph (128.86 km/h)
80 mph (128.75 km/h)85.41 mph (137.46 km/h)
85 mph (136.79 km/h)90.75 mph (146.05 km/h)
90 mph (144.84 km/h)96.09 mph (154.64 km/h)
95 mph (152.89 km/h)101.43 mph (163.23 km/h)
100 mph (160.93 km/h)106.76 mph (171.82 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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