Tire Size Calculator

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Stock Sizes

  • 255/75-16

Plus Sizes

  • 255/75-16

Accepts P-Metric and Inches
/ R
/ R
165/60r20 vs 225/45r20 Tire Comparison Side By Side
  165/60-20 225/45-20 Difference
Diameter inches (mm) 27.8 (706) 27.97 (710.5) 0.18 (4.5) 0.6%
Width inches (mm) 6.5 (165) 8.86 (225) 2.36 (60) 36.4%
Circum. inches (mm) 87.32 (2217.96) 87.88 (2232.1) 0.56 (14.14) 0.6%
Sidewall Height inches (mm) 3.9 (99) 3.99 (101.25) 0.09 (2.25) 2.3%
Revolutions per mile (km) 725.6 (450.86) 721 (448.01) -4.6 (-2.86) -0.6%

Speedometer Difference

Speedo Reading Actual Speed
20 mph (32.19 km/h)20.13 mph (32.39 km/h)
25 mph (40.23 km/h)25.16 mph (40.49 km/h)
30 mph (48.28 km/h)30.19 mph (48.59 km/h)
35 mph (56.33 km/h)35.22 mph (56.69 km/h)
40 mph (64.37 km/h)40.25 mph (64.78 km/h)
45 mph (72.42 km/h)45.29 mph (72.88 km/h)
50 mph (80.47 km/h)50.32 mph (80.98 km/h)
55 mph (88.51 km/h)55.35 mph (89.08 km/h)
60 mph (96.56 km/h)60.38 mph (97.18 km/h)
65 mph (104.61 km/h)65.41 mph (105.27 km/h)
70 mph (112.65 km/h)70.45 mph (113.37 km/h)
75 mph (120.7 km/h)75.48 mph (121.47 km/h)
80 mph (128.75 km/h)80.51 mph (129.57 km/h)
85 mph (136.79 km/h)85.54 mph (137.67 km/h)
90 mph (144.84 km/h)90.57 mph (145.76 km/h)
95 mph (152.89 km/h)95.61 mph (153.86 km/h)
100 mph (160.93 km/h)100.64 mph (161.96 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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