Tire Size Calculator

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Stock Sizes

  • 255/75-16

Plus Sizes

  • 255/75-16

Accepts P-Metric and Inches
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365/80r20 vs 330/95r20 Tire Comparison Side By Side
  365/80-20 330/95-20 Difference
Diameter inches (mm) 42.99 (1092) 44.69 (1135) 1.69 (43) 3.9%
Width inches (mm) 14.37 (365) 12.99 (330) -1.38 (-35) -9.6%
Circum. inches (mm) 135.06 (3430.62) 140.38 (3565.71) 5.32 (135.09) 3.9%
Sidewall Height inches (mm) 11.5 (292) 12.34 (313.5) 0.85 (21.5) 7.4%
Revolutions per mile (km) 469.11 (291.49) 451.34 (280.45) -17.77 (-11.04) -3.8%

Speedometer Difference

Speedo Reading Actual Speed
20 mph (32.19 km/h)20.79 mph (33.45 km/h)
25 mph (40.23 km/h)25.98 mph (41.82 km/h)
30 mph (48.28 km/h)31.18 mph (50.18 km/h)
35 mph (56.33 km/h)36.38 mph (58.55 km/h)
40 mph (64.37 km/h)41.58 mph (66.91 km/h)
45 mph (72.42 km/h)46.77 mph (75.27 km/h)
50 mph (80.47 km/h)51.97 mph (83.64 km/h)
55 mph (88.51 km/h)57.17 mph (92 km/h)
60 mph (96.56 km/h)62.36 mph (100.36 km/h)
65 mph (104.61 km/h)67.56 mph (108.73 km/h)
70 mph (112.65 km/h)72.76 mph (117.09 km/h)
75 mph (120.7 km/h)77.95 mph (125.45 km/h)
80 mph (128.75 km/h)83.15 mph (133.82 km/h)
85 mph (136.79 km/h)88.35 mph (142.18 km/h)
90 mph (144.84 km/h)93.54 mph (150.54 km/h)
95 mph (152.89 km/h)98.74 mph (158.91 km/h)
100 mph (160.93 km/h)103.94 mph (167.27 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
0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0
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