Tire Size Calculator

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Stock Sizes

  • 255/75-16

Plus Sizes

  • 255/75-16

Accepts P-Metric and Inches
/ R
/ R
225/60r18 vs 225/60r16 Tire Comparison Side By Side
  225/60-18 225/60-16 Difference
Diameter inches (mm) 28.63 (727.2) 26.63 (676.4) -2 (-50.8) -7%
Width inches (mm) 8.86 (225) 8.86 (225) 0 (0) 0%
Circum. inches (mm) 89.94 (2284.57) 83.66 (2124.97) -6.28 (-159.59) -7%
Sidewall Height inches (mm) 5.31 (135) 5.31 (135) 0 (0) 0%
Revolutions per mile (km) 704.44 (437.72) 757.35 (470.59) 52.91 (32.87) 7.5%

Speedometer Difference

Speedo Reading Actual Speed
20 mph (32.19 km/h)18.6 mph (29.94 km/h)
25 mph (40.23 km/h)23.25 mph (37.42 km/h)
30 mph (48.28 km/h)27.9 mph (44.91 km/h)
35 mph (56.33 km/h)32.56 mph (52.39 km/h)
40 mph (64.37 km/h)37.21 mph (59.88 km/h)
45 mph (72.42 km/h)41.86 mph (67.36 km/h)
50 mph (80.47 km/h)46.51 mph (74.85 km/h)
55 mph (88.51 km/h)51.16 mph (82.33 km/h)
60 mph (96.56 km/h)55.81 mph (89.82 km/h)
65 mph (104.61 km/h)60.46 mph (97.3 km/h)
70 mph (112.65 km/h)65.11 mph (104.78 km/h)
75 mph (120.7 km/h)69.76 mph (112.27 km/h)
80 mph (128.75 km/h)74.41 mph (119.75 km/h)
85 mph (136.79 km/h)79.06 mph (127.24 km/h)
90 mph (144.84 km/h)83.71 mph (134.72 km/h)
95 mph (152.89 km/h)88.36 mph (142.21 km/h)
100 mph (160.93 km/h)93.01 mph (149.69 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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