Tire Size Calculator

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Stock Sizes

  • 255/75-16

Plus Sizes

  • 255/75-16

Accepts P-Metric and Inches
/ R
/ R
385/65r22.5 vs 425/65r22.5 Tire Comparison Side By Side
  385/65-22.5 425/65-22.5 Difference
Diameter inches (mm) 42.2 (1072) 44.25 (1124) 2.05 (52) 4.9%
Width inches (mm) 15.16 (385) 16.73 (425) 1.57 (40) 10.4%
Circum. inches (mm) 132.59 (3367.79) 139.02 (3531.15) 6.43 (163.36) 4.9%
Sidewall Height inches (mm) 9.85 (250.25) 10.88 (276.25) 1.02 (26) 10.4%
Revolutions per mile (km) 477.86 (296.93) 455.76 (283.19) -22.11 (-13.74) -4.6%

Speedometer Difference

Speedo Reading Actual Speed
20 mph (32.19 km/h)20.97 mph (33.75 km/h)
25 mph (40.23 km/h)26.21 mph (42.19 km/h)
30 mph (48.28 km/h)31.46 mph (50.62 km/h)
35 mph (56.33 km/h)36.7 mph (59.06 km/h)
40 mph (64.37 km/h)41.94 mph (67.5 km/h)
45 mph (72.42 km/h)47.18 mph (75.93 km/h)
50 mph (80.47 km/h)52.43 mph (84.37 km/h)
55 mph (88.51 km/h)57.67 mph (92.81 km/h)
60 mph (96.56 km/h)62.91 mph (101.24 km/h)
65 mph (104.61 km/h)68.15 mph (109.68 km/h)
70 mph (112.65 km/h)73.4 mph (118.12 km/h)
75 mph (120.7 km/h)78.64 mph (126.56 km/h)
80 mph (128.75 km/h)83.88 mph (134.99 km/h)
85 mph (136.79 km/h)89.12 mph (143.43 km/h)
90 mph (144.84 km/h)94.37 mph (151.87 km/h)
95 mph (152.89 km/h)99.61 mph (160.3 km/h)
100 mph (160.93 km/h)104.85 mph (168.74 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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