Tire Size Calculator

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Stock Sizes

  • 255/75-16

Plus Sizes

  • 255/75-16

Accepts P-Metric and Inches
/ R
/ R
145/55r16 vs 115/55r15 Tire Comparison Side By Side
  145/55-16 115/55-15 Difference
Diameter inches (mm) 22.28 (565.9) 19.98 (507.5) -2.3 (-58.4) -10.3%
Width inches (mm) 5.71 (145) 4.53 (115) -1.18 (-30) -20.7%
Circum. inches (mm) 69.99 (1777.83) 62.77 (1594.36) -7.22 (-183.47) -10.3%
Sidewall Height inches (mm) 3.14 (79.75) 2.49 (63.25) -0.65 (-16.5) -20.7%
Revolutions per mile (km) 905.23 (562.48) 1009.4 (627.21) 104.17 (64.73) 11.5%

Speedometer Difference

Speedo Reading Actual Speed
20 mph (32.19 km/h)17.94 mph (28.87 km/h)
25 mph (40.23 km/h)22.42 mph (36.08 km/h)
30 mph (48.28 km/h)26.9 mph (43.3 km/h)
35 mph (56.33 km/h)31.39 mph (50.51 km/h)
40 mph (64.37 km/h)35.87 mph (57.73 km/h)
45 mph (72.42 km/h)40.36 mph (64.95 km/h)
50 mph (80.47 km/h)44.84 mph (72.16 km/h)
55 mph (88.51 km/h)49.32 mph (79.38 km/h)
60 mph (96.56 km/h)53.81 mph (86.6 km/h)
65 mph (104.61 km/h)58.29 mph (93.81 km/h)
70 mph (112.65 km/h)62.78 mph (101.03 km/h)
75 mph (120.7 km/h)67.26 mph (108.24 km/h)
80 mph (128.75 km/h)71.74 mph (115.46 km/h)
85 mph (136.79 km/h)76.23 mph (122.68 km/h)
90 mph (144.84 km/h)80.71 mph (129.89 km/h)
95 mph (152.89 km/h)85.2 mph (137.11 km/h)
100 mph (160.93 km/h)89.68 mph (144.33 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
0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0
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