Tire Size Calculator

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Stock Sizes

  • 255/75-16

Plus Sizes

  • 255/75-16

Accepts P-Metric and Inches
/ R
/ R
325/80r16 vs 315/75r16 Tire Comparison Side By Side
  325/80-16 315/75-16 Difference
Diameter inches (mm) 36.47 (926.4) 34.6 (878.9) -1.87 (-47.5) -5.1%
Width inches (mm) 12.8 (325) 12.4 (315) -0.39 (-10) -3.1%
Circum. inches (mm) 114.58 (2910.37) 108.71 (2761.15) -5.88 (-149.23) -5.1%
Sidewall Height inches (mm) 10.24 (260) 9.3 (236.25) -0.94 (-23.75) -9.1%
Revolutions per mile (km) 552.97 (343.6) 582.85 (362.17) 29.89 (18.57) 5.4%

Speedometer Difference

Speedo Reading Actual Speed
20 mph (32.19 km/h)18.97 mph (30.54 km/h)
25 mph (40.23 km/h)23.72 mph (38.17 km/h)
30 mph (48.28 km/h)28.46 mph (45.8 km/h)
35 mph (56.33 km/h)33.21 mph (53.44 km/h)
40 mph (64.37 km/h)37.95 mph (61.07 km/h)
45 mph (72.42 km/h)42.69 mph (68.71 km/h)
50 mph (80.47 km/h)47.44 mph (76.34 km/h)
55 mph (88.51 km/h)52.18 mph (83.98 km/h)
60 mph (96.56 km/h)56.92 mph (91.61 km/h)
65 mph (104.61 km/h)61.67 mph (99.24 km/h)
70 mph (112.65 km/h)66.41 mph (106.88 km/h)
75 mph (120.7 km/h)71.15 mph (114.51 km/h)
80 mph (128.75 km/h)75.9 mph (122.15 km/h)
85 mph (136.79 km/h)80.64 mph (129.78 km/h)
90 mph (144.84 km/h)85.39 mph (137.41 km/h)
95 mph (152.89 km/h)90.13 mph (145.05 km/h)
100 mph (160.93 km/h)94.87 mph (152.68 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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