Tire Size Calculator

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Stock Sizes

  • 255/75-16

Plus Sizes

  • 255/75-16

Accepts P-Metric and Inches
/ R
/ R
225/50r14 vs 225/40r14 Tire Comparison Side By Side
  225/50-14 225/40-14 Difference
Diameter inches (mm) 22.86 (580.6) 21.09 (535.6) -1.77 (-45) -7.8%
Width inches (mm) 8.86 (225) 8.86 (225) 0 (0) 0%
Circum. inches (mm) 71.81 (1824.01) 66.25 (1682.64) -5.57 (-141.37) -7.8%
Sidewall Height inches (mm) 4.43 (112.5) 3.54 (90) -0.89 (-22.5) -20%
Revolutions per mile (km) 882.31 (548.24) 956.44 (594.3) 74.13 (46.06) 8.4%

Speedometer Difference

Speedo Reading Actual Speed
20 mph (32.19 km/h)18.45 mph (29.69 km/h)
25 mph (40.23 km/h)23.06 mph (37.12 km/h)
30 mph (48.28 km/h)27.67 mph (44.54 km/h)
35 mph (56.33 km/h)32.29 mph (51.96 km/h)
40 mph (64.37 km/h)36.9 mph (59.38 km/h)
45 mph (72.42 km/h)41.51 mph (66.81 km/h)
50 mph (80.47 km/h)46.12 mph (74.23 km/h)
55 mph (88.51 km/h)50.74 mph (81.65 km/h)
60 mph (96.56 km/h)55.35 mph (89.08 km/h)
65 mph (104.61 km/h)59.96 mph (96.5 km/h)
70 mph (112.65 km/h)64.57 mph (103.92 km/h)
75 mph (120.7 km/h)69.19 mph (111.35 km/h)
80 mph (128.75 km/h)73.8 mph (118.77 km/h)
85 mph (136.79 km/h)78.41 mph (126.19 km/h)
90 mph (144.84 km/h)83.02 mph (133.62 km/h)
95 mph (152.89 km/h)87.64 mph (141.04 km/h)
100 mph (160.93 km/h)92.25 mph (148.46 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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