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 225/85r24 Tire Comparison Side By Side
  325/95-24 225/85-24 Difference
Diameter inches (mm) 48.31 (1227.1) 39.06 (992.1) -9.25 (-235) -19.2%
Width inches (mm) 12.8 (325) 8.86 (225) -3.94 (-100) -30.8%
Circum. inches (mm) 151.77 (3855.05) 122.71 (3116.77) -29.07 (-738.27) -19.2%
Sidewall Height inches (mm) 12.16 (308.75) 7.53 (191.25) -4.63 (-117.5) -38.1%
Revolutions per mile (km) 417.46 (259.4) 516.35 (320.84) 98.89 (61.44) 23.7%

Speedometer Difference

Speedo Reading Actual Speed
20 mph (32.19 km/h)16.17 mph (26.02 km/h)
25 mph (40.23 km/h)20.21 mph (32.53 km/h)
30 mph (48.28 km/h)24.25 mph (39.03 km/h)
35 mph (56.33 km/h)28.3 mph (45.54 km/h)
40 mph (64.37 km/h)32.34 mph (52.05 km/h)
45 mph (72.42 km/h)36.38 mph (58.55 km/h)
50 mph (80.47 km/h)40.42 mph (65.06 km/h)
55 mph (88.51 km/h)44.47 mph (71.56 km/h)
60 mph (96.56 km/h)48.51 mph (78.07 km/h)
65 mph (104.61 km/h)52.55 mph (84.57 km/h)
70 mph (112.65 km/h)56.59 mph (91.08 km/h)
75 mph (120.7 km/h)60.64 mph (97.59 km/h)
80 mph (128.75 km/h)64.68 mph (104.09 km/h)
85 mph (136.79 km/h)68.72 mph (110.6 km/h)
90 mph (144.84 km/h)72.76 mph (117.1 km/h)
95 mph (152.89 km/h)76.81 mph (123.61 km/h)
100 mph (160.93 km/h)80.85 mph (130.11 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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