Tire Size Calculator

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Stock Sizes

  • 255/75-16

Plus Sizes

  • 255/75-16

Accepts P-Metric and Inches
/ R
/ R
225/45r17 vs 215/55r17 Tire Comparison Side By Side
  225/45-17 215/55-17 Difference
Diameter inches (mm) 24.97 (634.3) 26.31 (668.3) 1.34 (34) 5.4%
Width inches (mm) 8.86 (225) 8.46 (215) -0.39 (-10) -4.4%
Circum. inches (mm) 78.45 (1992.71) 82.66 (2099.53) 4.21 (106.81) 5.4%
Sidewall Height inches (mm) 3.99 (101.25) 4.66 (118.25) 0.67 (17) 16.8%
Revolutions per mile (km) 807.61 (501.83) 766.53 (476.3) -41.09 (-25.53) -5.1%

Speedometer Difference

Speedo Reading Actual Speed
20 mph (32.19 km/h)21.07 mph (33.91 km/h)
25 mph (40.23 km/h)26.34 mph (42.39 km/h)
30 mph (48.28 km/h)31.61 mph (50.87 km/h)
35 mph (56.33 km/h)36.88 mph (59.35 km/h)
40 mph (64.37 km/h)42.14 mph (67.82 km/h)
45 mph (72.42 km/h)47.41 mph (76.3 km/h)
50 mph (80.47 km/h)52.68 mph (84.78 km/h)
55 mph (88.51 km/h)57.95 mph (93.26 km/h)
60 mph (96.56 km/h)63.22 mph (101.74 km/h)
65 mph (104.61 km/h)68.48 mph (110.21 km/h)
70 mph (112.65 km/h)73.75 mph (118.69 km/h)
75 mph (120.7 km/h)79.02 mph (127.17 km/h)
80 mph (128.75 km/h)84.29 mph (135.65 km/h)
85 mph (136.79 km/h)89.56 mph (144.13 km/h)
90 mph (144.84 km/h)94.82 mph (152.61 km/h)
95 mph (152.89 km/h)100.09 mph (161.08 km/h)
100 mph (160.93 km/h)105.36 mph (169.56 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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