Tire Size Calculator

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Stock Sizes

  • 255/75-16

Plus Sizes

  • 255/75-16

Accepts P-Metric and Inches
/ R
/ R
325/80r15 vs 295/70r15 Tire Comparison Side By Side
  325/80-15 295/70-15 Difference
Diameter inches (mm) 35.47 (901) 31.26 (794) -4.21 (-107) -11.9%
Width inches (mm) 12.8 (325) 11.61 (295) -1.18 (-30) -9.2%
Circum. inches (mm) 111.44 (2830.57) 98.21 (2494.42) -13.23 (-336.15) -11.9%
Sidewall Height inches (mm) 10.24 (260) 8.13 (206.5) -2.11 (-53.5) -20.6%
Revolutions per mile (km) 568.56 (353.28) 645.18 (400.89) 76.62 (47.61) 13.5%

Speedometer Difference

Speedo Reading Actual Speed
20 mph (32.19 km/h)17.62 mph (28.36 km/h)
25 mph (40.23 km/h)22.03 mph (35.46 km/h)
30 mph (48.28 km/h)26.44 mph (42.55 km/h)
35 mph (56.33 km/h)30.84 mph (49.64 km/h)
40 mph (64.37 km/h)35.25 mph (56.73 km/h)
45 mph (72.42 km/h)39.66 mph (63.82 km/h)
50 mph (80.47 km/h)44.06 mph (70.91 km/h)
55 mph (88.51 km/h)48.47 mph (78 km/h)
60 mph (96.56 km/h)52.87 mph (85.09 km/h)
65 mph (104.61 km/h)57.28 mph (92.18 km/h)
70 mph (112.65 km/h)61.69 mph (99.28 km/h)
75 mph (120.7 km/h)66.09 mph (106.37 km/h)
80 mph (128.75 km/h)70.5 mph (113.46 km/h)
85 mph (136.79 km/h)74.91 mph (120.55 km/h)
90 mph (144.84 km/h)79.31 mph (127.64 km/h)
95 mph (152.89 km/h)83.72 mph (134.73 km/h)
100 mph (160.93 km/h)88.12 mph (141.82 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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