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 225/60r18 Tire Comparison Side By Side
  225/65-17 225/60-18 Difference
Diameter inches (mm) 28.52 (724.3) 28.63 (727.2) 0.11 (2.9) 0.4%
Width inches (mm) 8.86 (225) 8.86 (225) 0 (0) 0%
Circum. inches (mm) 89.58 (2275.46) 89.94 (2284.57) 0.36 (9.11) 0.4%
Sidewall Height inches (mm) 5.76 (146.25) 5.31 (135) -0.44 (-11.25) -7.7%
Revolutions per mile (km) 707.26 (439.47) 704.44 (437.72) -2.82 (-1.75) -0.4%

Speedometer Difference

Speedo Reading Actual Speed
20 mph (32.19 km/h)20.08 mph (32.32 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 (88.87 km/h)
60 mph (96.56 km/h)60.24 mph (96.95 km/h)
65 mph (104.61 km/h)65.26 mph (105.03 km/h)
70 mph (112.65 km/h)70.28 mph (113.11 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 (145.42 km/h)
95 mph (152.89 km/h)95.38 mph (153.5 km/h)
100 mph (160.93 km/h)100.4 mph (161.58 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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