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 205/30r14 Tire Comparison Side By Side
  225/40-14 205/30-14 Difference
Diameter inches (mm) 21.09 (535.6) 18.84 (478.6) -2.24 (-57) -10.6%
Width inches (mm) 8.86 (225) 8.07 (205) -0.79 (-20) -8.9%
Circum. inches (mm) 66.25 (1682.64) 59.2 (1503.57) -7.05 (-179.07) -10.6%
Sidewall Height inches (mm) 3.54 (90) 2.42 (61.5) -1.12 (-28.5) -31.7%
Revolutions per mile (km) 956.44 (594.3) 1070.35 (665.08) 113.91 (70.78) 11.9%

Speedometer Difference

Speedo Reading Actual Speed
20 mph (32.19 km/h)17.87 mph (28.76 km/h)
25 mph (40.23 km/h)22.34 mph (35.95 km/h)
30 mph (48.28 km/h)26.81 mph (43.14 km/h)
35 mph (56.33 km/h)31.28 mph (50.33 km/h)
40 mph (64.37 km/h)35.74 mph (57.52 km/h)
45 mph (72.42 km/h)40.21 mph (64.71 km/h)
50 mph (80.47 km/h)44.68 mph (71.9 km/h)
55 mph (88.51 km/h)49.15 mph (79.09 km/h)
60 mph (96.56 km/h)53.61 mph (86.28 km/h)
65 mph (104.61 km/h)58.08 mph (93.47 km/h)
70 mph (112.65 km/h)62.55 mph (100.67 km/h)
75 mph (120.7 km/h)67.02 mph (107.86 km/h)
80 mph (128.75 km/h)71.49 mph (115.05 km/h)
85 mph (136.79 km/h)75.95 mph (122.24 km/h)
90 mph (144.84 km/h)80.42 mph (129.43 km/h)
95 mph (152.89 km/h)84.89 mph (136.62 km/h)
100 mph (160.93 km/h)89.36 mph (143.81 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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