Tire Size Calculator

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Stock Sizes

  • 255/75-16

Plus Sizes

  • 255/75-16

Accepts P-Metric and Inches
/ R
/ R
225/70r19.5 vs 365/80r20 Tire Comparison Side By Side
  225/70-19.5 365/80-20 Difference
Diameter inches (mm) 31.9 (810.3) 42.99 (1092) 11.09 (281.7) 34.8%
Width inches (mm) 8.86 (225) 14.37 (365) 5.51 (140) 62.2%
Circum. inches (mm) 100.22 (2545.63) 135.06 (3430.62) 34.84 (884.99) 34.8%
Sidewall Height inches (mm) 6.2 (157.5) 11.5 (292) 5.3 (134.5) 85.4%
Revolutions per mile (km) 632.2 (392.83) 469.11 (291.49) -163.09 (-101.34) -25.8%

Speedometer Difference

Speedo Reading Actual Speed
20 mph (32.19 km/h)26.95 mph (43.38 km/h)
25 mph (40.23 km/h)33.69 mph (54.22 km/h)
30 mph (48.28 km/h)40.43 mph (65.07 km/h)
35 mph (56.33 km/h)47.17 mph (75.91 km/h)
40 mph (64.37 km/h)53.91 mph (86.75 km/h)
45 mph (72.42 km/h)60.64 mph (97.6 km/h)
50 mph (80.47 km/h)67.38 mph (108.44 km/h)
55 mph (88.51 km/h)74.12 mph (119.29 km/h)
60 mph (96.56 km/h)80.86 mph (130.13 km/h)
65 mph (104.61 km/h)87.6 mph (140.97 km/h)
70 mph (112.65 km/h)94.34 mph (151.82 km/h)
75 mph (120.7 km/h)101.07 mph (162.66 km/h)
80 mph (128.75 km/h)107.81 mph (173.51 km/h)
85 mph (136.79 km/h)114.55 mph (184.35 km/h)
90 mph (144.84 km/h)121.29 mph (195.2 km/h)
95 mph (152.89 km/h)128.03 mph (206.04 km/h)
100 mph (160.93 km/h)134.76 mph (216.88 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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