Tire Size Calculator

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Stock Sizes

  • 255/75-16

Plus Sizes

  • 255/75-16

Accepts P-Metric and Inches
/ R
/ R
325/95r24 vs 385/65r22.5 Tire Comparison Side By Side
  325/95-24 385/65-22.5 Difference
Diameter inches (mm) 48.31 (1227.1) 42.2 (1072) -6.11 (-155.1) -12.6%
Width inches (mm) 12.8 (325) 15.16 (385) 2.36 (60) 18.5%
Circum. inches (mm) 151.77 (3855.05) 132.59 (3367.79) -19.18 (-487.26) -12.6%
Sidewall Height inches (mm) 12.16 (308.75) 9.85 (250.25) -2.3 (-58.5) -18.9%
Revolutions per mile (km) 417.46 (259.4) 477.86 (296.93) 60.4 (37.53) 14.5%

Speedometer Difference

Speedo Reading Actual Speed
20 mph (32.19 km/h)17.47 mph (28.12 km/h)
25 mph (40.23 km/h)21.84 mph (35.15 km/h)
30 mph (48.28 km/h)26.21 mph (42.18 km/h)
35 mph (56.33 km/h)30.58 mph (49.21 km/h)
40 mph (64.37 km/h)34.94 mph (56.24 km/h)
45 mph (72.42 km/h)39.31 mph (63.27 km/h)
50 mph (80.47 km/h)43.68 mph (70.3 km/h)
55 mph (88.51 km/h)48.05 mph (77.33 km/h)
60 mph (96.56 km/h)52.42 mph (84.36 km/h)
65 mph (104.61 km/h)56.78 mph (91.39 km/h)
70 mph (112.65 km/h)61.15 mph (98.42 km/h)
75 mph (120.7 km/h)65.52 mph (105.44 km/h)
80 mph (128.75 km/h)69.89 mph (112.47 km/h)
85 mph (136.79 km/h)74.26 mph (119.5 km/h)
90 mph (144.84 km/h)78.62 mph (126.53 km/h)
95 mph (152.89 km/h)82.99 mph (133.56 km/h)
100 mph (160.93 km/h)87.36 mph (140.59 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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