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 325/70r14 Tire Comparison Side By Side
  325/95-24 325/70-14 Difference
Diameter inches (mm) 48.31 (1227.1) 31.91 (810.6) -16.4 (-416.5) -33.9%
Width inches (mm) 12.8 (325) 12.8 (325) 0 (0) 0%
Circum. inches (mm) 151.77 (3855.05) 100.26 (2546.58) -51.51 (-1308.47) -33.9%
Sidewall Height inches (mm) 12.16 (308.75) 8.96 (227.5) -3.2 (-81.25) -26.3%
Revolutions per mile (km) 417.46 (259.4) 631.96 (392.68) 214.5 (133.28) 51.4%

Speedometer Difference

Speedo Reading Actual Speed
20 mph (32.19 km/h)13.21 mph (21.26 km/h)
25 mph (40.23 km/h)16.51 mph (26.58 km/h)
30 mph (48.28 km/h)19.82 mph (31.89 km/h)
35 mph (56.33 km/h)23.12 mph (37.21 km/h)
40 mph (64.37 km/h)26.42 mph (42.52 km/h)
45 mph (72.42 km/h)29.73 mph (47.84 km/h)
50 mph (80.47 km/h)33.03 mph (53.16 km/h)
55 mph (88.51 km/h)36.33 mph (58.47 km/h)
60 mph (96.56 km/h)39.63 mph (63.79 km/h)
65 mph (104.61 km/h)42.94 mph (69.1 km/h)
70 mph (112.65 km/h)46.24 mph (74.42 km/h)
75 mph (120.7 km/h)49.54 mph (79.73 km/h)
80 mph (128.75 km/h)52.85 mph (85.05 km/h)
85 mph (136.79 km/h)56.15 mph (90.36 km/h)
90 mph (144.84 km/h)59.45 mph (95.68 km/h)
95 mph (152.89 km/h)62.76 mph (101 km/h)
100 mph (160.93 km/h)66.06 mph (106.31 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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