Tire Size Calculator

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Stock Sizes

  • 255/75-16

Plus Sizes

  • 255/75-16

Accepts P-Metric and Inches
/ R
/ R
215/75r17 vs 225/65r17 Tire Comparison Side By Side
  215/75-17 225/65-17 Difference
Diameter inches (mm) 29.7 (754.3) 28.52 (724.3) -1.18 (-30) -4%
Width inches (mm) 8.46 (215) 8.86 (225) 0.39 (10) 4.7%
Circum. inches (mm) 93.3 (2369.7) 89.58 (2275.46) -3.71 (-94.25) -4%
Sidewall Height inches (mm) 6.35 (161.25) 5.76 (146.25) -0.59 (-15) -9.3%
Revolutions per mile (km) 679.13 (421.99) 707.26 (439.47) 28.13 (17.48) 4.1%

Speedometer Difference

Speedo Reading Actual Speed
20 mph (32.19 km/h)19.2 mph (30.91 km/h)
25 mph (40.23 km/h)24.01 mph (38.63 km/h)
30 mph (48.28 km/h)28.81 mph (46.36 km/h)
35 mph (56.33 km/h)33.61 mph (54.09 km/h)
40 mph (64.37 km/h)38.41 mph (61.81 km/h)
45 mph (72.42 km/h)43.21 mph (69.54 km/h)
50 mph (80.47 km/h)48.01 mph (77.27 km/h)
55 mph (88.51 km/h)52.81 mph (84.99 km/h)
60 mph (96.56 km/h)57.61 mph (92.72 km/h)
65 mph (104.61 km/h)62.41 mph (100.45 km/h)
70 mph (112.65 km/h)67.22 mph (108.17 km/h)
75 mph (120.7 km/h)72.02 mph (115.9 km/h)
80 mph (128.75 km/h)76.82 mph (123.63 km/h)
85 mph (136.79 km/h)81.62 mph (131.35 km/h)
90 mph (144.84 km/h)86.42 mph (139.08 km/h)
95 mph (152.89 km/h)91.22 mph (146.81 km/h)
100 mph (160.93 km/h)96.02 mph (154.53 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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