Tire Size Calculator

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Stock Sizes

  • 255/75-16

Plus Sizes

  • 255/75-16

Accepts P-Metric and Inches
/ R
/ R
215/55r17 vs 225/45r17 Tire Comparison Side By Side
  215/55-17 225/45-17 Difference
Diameter inches (mm) 26.31 (668.3) 24.97 (634.3) -1.34 (-34) -5.1%
Width inches (mm) 8.46 (215) 8.86 (225) 0.39 (10) 4.7%
Circum. inches (mm) 82.66 (2099.53) 78.45 (1992.71) -4.21 (-106.81) -5.1%
Sidewall Height inches (mm) 4.66 (118.25) 3.99 (101.25) -0.67 (-17) -14.4%
Revolutions per mile (km) 766.53 (476.3) 807.61 (501.83) 41.09 (25.53) 5.4%

Speedometer Difference

Speedo Reading Actual Speed
20 mph (32.19 km/h)18.98 mph (30.55 km/h)
25 mph (40.23 km/h)23.73 mph (38.19 km/h)
30 mph (48.28 km/h)28.47 mph (45.82 km/h)
35 mph (56.33 km/h)33.22 mph (53.46 km/h)
40 mph (64.37 km/h)37.96 mph (61.1 km/h)
45 mph (72.42 km/h)42.71 mph (68.74 km/h)
50 mph (80.47 km/h)47.46 mph (76.37 km/h)
55 mph (88.51 km/h)52.2 mph (84.01 km/h)
60 mph (96.56 km/h)56.95 mph (91.65 km/h)
65 mph (104.61 km/h)61.69 mph (99.29 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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