Tire Size Calculator

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Stock Sizes

  • 255/75-16

Plus Sizes

  • 255/75-16

Accepts P-Metric and Inches
/ R
/ R
225/65r17 vs 225/55r17 Tire Comparison Side By Side
  225/65-17 225/55-17 Difference
Diameter inches (mm) 28.52 (724.3) 26.74 (679.3) -1.77 (-45) -6.2%
Width inches (mm) 8.86 (225) 8.86 (225) 0 (0) 0%
Circum. inches (mm) 89.58 (2275.46) 84.02 (2134.08) -5.57 (-141.37) -6.2%
Sidewall Height inches (mm) 5.76 (146.25) 4.87 (123.75) -0.89 (-22.5) -15.4%
Revolutions per mile (km) 707.26 (439.47) 754.11 (468.58) 46.85 (29.11) 6.6%

Speedometer Difference

Speedo Reading Actual Speed
20 mph (32.19 km/h)18.76 mph (30.19 km/h)
25 mph (40.23 km/h)23.45 mph (37.73 km/h)
30 mph (48.28 km/h)28.14 mph (45.28 km/h)
35 mph (56.33 km/h)32.83 mph (52.83 km/h)
40 mph (64.37 km/h)37.51 mph (60.37 km/h)
45 mph (72.42 km/h)42.2 mph (67.92 km/h)
50 mph (80.47 km/h)46.89 mph (75.47 km/h)
55 mph (88.51 km/h)51.58 mph (83.01 km/h)
60 mph (96.56 km/h)56.27 mph (90.56 km/h)
65 mph (104.61 km/h)60.96 mph (98.11 km/h)
70 mph (112.65 km/h)65.65 mph (105.66 km/h)
75 mph (120.7 km/h)70.34 mph (113.2 km/h)
80 mph (128.75 km/h)75.03 mph (120.75 km/h)
85 mph (136.79 km/h)79.72 mph (128.3 km/h)
90 mph (144.84 km/h)84.41 mph (135.84 km/h)
95 mph (152.89 km/h)89.1 mph (143.39 km/h)
100 mph (160.93 km/h)93.79 mph (150.94 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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