Tire Size Calculator

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Stock Sizes

  • 255/75-16

Plus Sizes

  • 255/75-16

Accepts P-Metric and Inches
/ R
/ R
165/70r10 vs 225/45r10 Tire Comparison Side By Side
  165/70-10 225/45-10 Difference
Diameter inches (mm) 19.09 (485) 17.97 (456.5) -1.12 (-28.5) -5.9%
Width inches (mm) 6.5 (165) 8.86 (225) 2.36 (60) 36.4%
Circum. inches (mm) 59.99 (1523.67) 56.46 (1434.14) -3.53 (-89.54) -5.9%
Sidewall Height inches (mm) 4.55 (115.5) 3.99 (101.25) -0.56 (-14.25) -12.3%
Revolutions per mile (km) 1056.23 (656.31) 1122.17 (697.28) 65.94 (40.97) 6.2%

Speedometer Difference

Speedo Reading Actual Speed
20 mph (32.19 km/h)18.82 mph (30.3 km/h)
25 mph (40.23 km/h)23.53 mph (37.87 km/h)
30 mph (48.28 km/h)28.24 mph (45.44 km/h)
35 mph (56.33 km/h)32.94 mph (53.02 km/h)
40 mph (64.37 km/h)37.65 mph (60.59 km/h)
45 mph (72.42 km/h)42.36 mph (68.16 km/h)
50 mph (80.47 km/h)47.06 mph (75.74 km/h)
55 mph (88.51 km/h)51.77 mph (83.31 km/h)
60 mph (96.56 km/h)56.47 mph (90.89 km/h)
65 mph (104.61 km/h)61.18 mph (98.46 km/h)
70 mph (112.65 km/h)65.89 mph (106.03 km/h)
75 mph (120.7 km/h)70.59 mph (113.61 km/h)
80 mph (128.75 km/h)75.3 mph (121.18 km/h)
85 mph (136.79 km/h)80.01 mph (128.76 km/h)
90 mph (144.84 km/h)84.71 mph (136.33 km/h)
95 mph (152.89 km/h)89.42 mph (143.9 km/h)
100 mph (160.93 km/h)94.12 mph (151.48 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
0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0
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