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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325/95r24 vs 381/60r22 Tire Comparison Side By Side
  325/95-24 381/60-22 Difference
Diameter inches (mm) 48.31 (1227.1) 40 (1016) -8.31 (-211.1) -17.2%
Width inches (mm) 12.8 (325) 15 (381) 2.2 (56) 17.2%
Circum. inches (mm) 151.77 (3855.05) 125.66 (3191.86) -26.11 (-663.19) -17.2%
Sidewall Height inches (mm) 12.16 (308.75) 9 (228.6) -3.16 (-80.15) -26%
Revolutions per mile (km) 417.46 (259.4) 504.2 (313.3) 86.74 (53.9) 20.8%

Speedometer Difference

Speedo Reading Actual Speed
20 mph (32.19 km/h)16.56 mph (26.65 km/h)
25 mph (40.23 km/h)20.7 mph (33.31 km/h)
30 mph (48.28 km/h)24.84 mph (39.97 km/h)
35 mph (56.33 km/h)28.98 mph (46.64 km/h)
40 mph (64.37 km/h)33.12 mph (53.3 km/h)
45 mph (72.42 km/h)37.26 mph (59.96 km/h)
50 mph (80.47 km/h)41.4 mph (66.62 km/h)
55 mph (88.51 km/h)45.54 mph (73.29 km/h)
60 mph (96.56 km/h)49.68 mph (79.95 km/h)
65 mph (104.61 km/h)53.82 mph (86.61 km/h)
70 mph (112.65 km/h)57.96 mph (93.27 km/h)
75 mph (120.7 km/h)62.1 mph (99.94 km/h)
80 mph (128.75 km/h)66.24 mph (106.6 km/h)
85 mph (136.79 km/h)70.38 mph (113.26 km/h)
90 mph (144.84 km/h)74.52 mph (119.92 km/h)
95 mph (152.89 km/h)78.66 mph (126.59 km/h)
100 mph (160.93 km/h)82.8 mph (133.25 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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