Tire Size Calculator

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Stock Sizes

  • 255/75-16

Plus Sizes

  • 255/75-16

Accepts P-Metric and Inches
/ R
/ R
225/40r14 vs 270/40r14 Tire Comparison Side By Side
  225/40-14 270/40-14 Difference
Diameter inches (mm) 21.09 (535.6) 22.5 (571.6) 1.42 (36) 6.7%
Width inches (mm) 8.86 (225) 10.63 (270) 1.77 (45) 20%
Circum. inches (mm) 66.25 (1682.64) 70.7 (1795.73) 4.45 (113.1) 6.7%
Sidewall Height inches (mm) 3.54 (90) 4.25 (108) 0.71 (18) 20%
Revolutions per mile (km) 956.44 (594.3) 896.2 (556.87) -60.24 (-37.43) -6.3%

Speedometer Difference

Speedo Reading Actual Speed
20 mph (32.19 km/h)21.34 mph (34.35 km/h)
25 mph (40.23 km/h)26.68 mph (42.94 km/h)
30 mph (48.28 km/h)32.02 mph (51.53 km/h)
35 mph (56.33 km/h)37.35 mph (60.11 km/h)
40 mph (64.37 km/h)42.69 mph (68.7 km/h)
45 mph (72.42 km/h)48.02 mph (77.29 km/h)
50 mph (80.47 km/h)53.36 mph (85.88 km/h)
55 mph (88.51 km/h)58.7 mph (94.46 km/h)
60 mph (96.56 km/h)64.03 mph (103.05 km/h)
65 mph (104.61 km/h)69.37 mph (111.64 km/h)
70 mph (112.65 km/h)74.71 mph (120.23 km/h)
75 mph (120.7 km/h)80.04 mph (128.81 km/h)
80 mph (128.75 km/h)85.38 mph (137.4 km/h)
85 mph (136.79 km/h)90.71 mph (145.99 km/h)
90 mph (144.84 km/h)96.05 mph (154.58 km/h)
95 mph (152.89 km/h)101.39 mph (163.16 km/h)
100 mph (160.93 km/h)106.72 mph (171.75 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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