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 225/50r17 Tire Comparison Side By Side
  215/55-17 225/50-17 Difference
Diameter inches (mm) 26.31 (668.3) 25.86 (656.8) -0.45 (-11.5) -1.7%
Width inches (mm) 8.46 (215) 8.86 (225) 0.39 (10) 4.7%
Circum. inches (mm) 82.66 (2099.53) 81.24 (2063.4) -1.42 (-36.13) -1.7%
Sidewall Height inches (mm) 4.66 (118.25) 4.43 (112.5) -0.23 (-5.75) -4.9%
Revolutions per mile (km) 766.53 (476.3) 779.95 (484.64) 13.42 (8.34) 1.8%

Speedometer Difference

Speedo Reading Actual Speed
20 mph (32.19 km/h)19.66 mph (31.63 km/h)
25 mph (40.23 km/h)24.57 mph (39.54 km/h)
30 mph (48.28 km/h)29.48 mph (47.45 km/h)
35 mph (56.33 km/h)34.4 mph (55.36 km/h)
40 mph (64.37 km/h)39.31 mph (63.27 km/h)
45 mph (72.42 km/h)44.23 mph (71.17 km/h)
50 mph (80.47 km/h)49.14 mph (79.08 km/h)
55 mph (88.51 km/h)54.05 mph (86.99 km/h)
60 mph (96.56 km/h)58.97 mph (94.9 km/h)
65 mph (104.61 km/h)63.88 mph (102.81 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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