Tire Size Calculator

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Stock Sizes

  • 255/75-16

Plus Sizes

  • 255/75-16

Accepts P-Metric and Inches
/ R
/ R
225/55r17 vs 215/65r16 Tire Comparison Side By Side
  225/55-17 215/65-16 Difference
Diameter inches (mm) 26.74 (679.3) 27 (685.9) 0.26 (6.6) 1%
Width inches (mm) 8.86 (225) 8.46 (215) -0.39 (-10) -4.4%
Circum. inches (mm) 84.02 (2134.08) 84.84 (2154.82) 0.82 (20.73) 1%
Sidewall Height inches (mm) 4.87 (123.75) 5.5 (139.75) 0.63 (16) 12.9%
Revolutions per mile (km) 754.11 (468.58) 746.86 (464.08) -7.26 (-4.51) -1%

Speedometer Difference

Speedo Reading Actual Speed
20 mph (32.19 km/h)20.19 mph (32.5 km/h)
25 mph (40.23 km/h)25.24 mph (40.62 km/h)
30 mph (48.28 km/h)30.29 mph (48.75 km/h)
35 mph (56.33 km/h)35.34 mph (56.87 km/h)
40 mph (64.37 km/h)40.39 mph (65 km/h)
45 mph (72.42 km/h)45.44 mph (73.12 km/h)
50 mph (80.47 km/h)50.49 mph (81.25 km/h)
55 mph (88.51 km/h)55.53 mph (89.37 km/h)
60 mph (96.56 km/h)60.58 mph (97.5 km/h)
65 mph (104.61 km/h)65.63 mph (105.62 km/h)
70 mph (112.65 km/h)70.68 mph (113.75 km/h)
75 mph (120.7 km/h)75.73 mph (121.87 km/h)
80 mph (128.75 km/h)80.78 mph (130 km/h)
85 mph (136.79 km/h)85.83 mph (138.12 km/h)
90 mph (144.84 km/h)90.87 mph (146.25 km/h)
95 mph (152.89 km/h)95.92 mph (154.37 km/h)
100 mph (160.93 km/h)100.97 mph (162.5 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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