Tire Size Calculator

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Stock Sizes

  • 255/75-16

Plus Sizes

  • 255/75-16

Accepts P-Metric and Inches
/ R
/ R
215/55r16 vs 225/50r17 Tire Comparison Side By Side
  215/55-16 225/50-17 Difference
Diameter inches (mm) 25.31 (642.9) 25.86 (656.8) 0.55 (13.9) 2.2%
Width inches (mm) 8.46 (215) 8.86 (225) 0.39 (10) 4.7%
Circum. inches (mm) 79.52 (2019.73) 81.24 (2063.4) 1.72 (43.67) 2.2%
Sidewall Height inches (mm) 4.66 (118.25) 4.43 (112.5) -0.23 (-5.75) -4.9%
Revolutions per mile (km) 796.81 (495.11) 779.95 (484.64) -16.86 (-10.48) -2.1%

Speedometer Difference

Speedo Reading Actual Speed
20 mph (32.19 km/h)20.43 mph (32.88 km/h)
25 mph (40.23 km/h)25.54 mph (41.1 km/h)
30 mph (48.28 km/h)30.65 mph (49.32 km/h)
35 mph (56.33 km/h)35.76 mph (57.54 km/h)
40 mph (64.37 km/h)40.86 mph (65.77 km/h)
45 mph (72.42 km/h)45.97 mph (73.99 km/h)
50 mph (80.47 km/h)51.08 mph (82.21 km/h)
55 mph (88.51 km/h)56.19 mph (90.43 km/h)
60 mph (96.56 km/h)61.3 mph (98.65 km/h)
65 mph (104.61 km/h)66.41 mph (106.87 km/h)
70 mph (112.65 km/h)71.51 mph (115.09 km/h)
75 mph (120.7 km/h)76.62 mph (123.31 km/h)
80 mph (128.75 km/h)81.73 mph (131.53 km/h)
85 mph (136.79 km/h)86.84 mph (139.75 km/h)
90 mph (144.84 km/h)91.95 mph (147.97 km/h)
95 mph (152.89 km/h)97.05 mph (156.19 km/h)
100 mph (160.93 km/h)102.16 mph (164.41 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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