Tire Size Calculator

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Stock Sizes

  • 255/75-16

Plus Sizes

  • 255/75-16

Accepts P-Metric and Inches
/ R
/ R
225/55r19 vs 225/45r19 Tire Comparison Side By Side
  225/55-19 225/45-19 Difference
Diameter inches (mm) 28.74 (730.1) 26.97 (685.1) -1.77 (-45) -6.2%
Width inches (mm) 8.86 (225) 8.86 (225) 0 (0) 0%
Circum. inches (mm) 90.3 (2293.68) 84.74 (2152.31) -5.57 (-141.37) -6.2%
Sidewall Height inches (mm) 4.87 (123.75) 3.99 (101.25) -0.89 (-22.5) -18.2%
Revolutions per mile (km) 701.64 (435.98) 747.73 (464.62) 46.09 (28.64) 6.6%

Speedometer Difference

Speedo Reading Actual Speed
20 mph (32.19 km/h)18.77 mph (30.2 km/h)
25 mph (40.23 km/h)23.46 mph (37.75 km/h)
30 mph (48.28 km/h)28.15 mph (45.3 km/h)
35 mph (56.33 km/h)32.84 mph (52.86 km/h)
40 mph (64.37 km/h)37.53 mph (60.41 km/h)
45 mph (72.42 km/h)42.23 mph (67.96 km/h)
50 mph (80.47 km/h)46.92 mph (75.51 km/h)
55 mph (88.51 km/h)51.61 mph (83.06 km/h)
60 mph (96.56 km/h)56.3 mph (90.61 km/h)
65 mph (104.61 km/h)60.99 mph (98.16 km/h)
70 mph (112.65 km/h)65.69 mph (105.71 km/h)
75 mph (120.7 km/h)70.38 mph (113.26 km/h)
80 mph (128.75 km/h)75.07 mph (120.81 km/h)
85 mph (136.79 km/h)79.76 mph (128.36 km/h)
90 mph (144.84 km/h)84.45 mph (135.91 km/h)
95 mph (152.89 km/h)89.14 mph (143.46 km/h)
100 mph (160.93 km/h)93.84 mph (151.02 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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