Tire Size Calculator

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Stock Sizes

  • 255/75-16

Plus Sizes

  • 255/75-16

Accepts P-Metric and Inches
/ R
/ R
125/80r17 vs 225/45r17 Tire Comparison Side By Side
  125/80-17 225/45-17 Difference
Diameter inches (mm) 24.87 (631.8) 24.97 (634.3) 0.1 (2.5) 0.4%
Width inches (mm) 4.92 (125) 8.86 (225) 3.94 (100) 80%
Circum. inches (mm) 78.14 (1984.86) 78.45 (1992.71) 0.31 (7.85) 0.4%
Sidewall Height inches (mm) 3.94 (100) 3.99 (101.25) 0.05 (1.25) 1.3%
Revolutions per mile (km) 810.81 (503.81) 807.61 (501.83) -3.2 (-1.99) -0.4%

Speedometer Difference

Speedo Reading Actual Speed
20 mph (32.19 km/h)20.08 mph (32.31 km/h)
25 mph (40.23 km/h)25.1 mph (40.39 km/h)
30 mph (48.28 km/h)30.12 mph (48.47 km/h)
35 mph (56.33 km/h)35.14 mph (56.55 km/h)
40 mph (64.37 km/h)40.16 mph (64.63 km/h)
45 mph (72.42 km/h)45.18 mph (72.71 km/h)
50 mph (80.47 km/h)50.2 mph (80.79 km/h)
55 mph (88.51 km/h)55.22 mph (88.86 km/h)
60 mph (96.56 km/h)60.24 mph (96.94 km/h)
65 mph (104.61 km/h)65.26 mph (105.02 km/h)
70 mph (112.65 km/h)70.28 mph (113.1 km/h)
75 mph (120.7 km/h)75.3 mph (121.18 km/h)
80 mph (128.75 km/h)80.32 mph (129.26 km/h)
85 mph (136.79 km/h)85.34 mph (137.34 km/h)
90 mph (144.84 km/h)90.36 mph (145.41 km/h)
95 mph (152.89 km/h)95.38 mph (153.49 km/h)
100 mph (160.93 km/h)100.4 mph (161.57 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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