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 215/35r14 Tire Comparison Side By Side
  225/40-14 215/35-14 Difference
Diameter inches (mm) 21.09 (535.6) 19.93 (506.1) -1.16 (-29.5) -5.5%
Width inches (mm) 8.86 (225) 8.46 (215) -0.39 (-10) -4.4%
Circum. inches (mm) 66.25 (1682.64) 62.6 (1589.96) -3.65 (-92.68) -5.5%
Sidewall Height inches (mm) 3.54 (90) 2.96 (75.25) -0.58 (-14.75) -16.4%
Revolutions per mile (km) 956.44 (594.3) 1012.19 (628.95) 55.75 (34.64) 5.8%

Speedometer Difference

Speedo Reading Actual Speed
20 mph (32.19 km/h)18.9 mph (30.41 km/h)
25 mph (40.23 km/h)23.62 mph (38.02 km/h)
30 mph (48.28 km/h)28.35 mph (45.62 km/h)
35 mph (56.33 km/h)33.07 mph (53.22 km/h)
40 mph (64.37 km/h)37.8 mph (60.83 km/h)
45 mph (72.42 km/h)42.52 mph (68.43 km/h)
50 mph (80.47 km/h)47.25 mph (76.04 km/h)
55 mph (88.51 km/h)51.97 mph (83.64 km/h)
60 mph (96.56 km/h)56.7 mph (91.24 km/h)
65 mph (104.61 km/h)61.42 mph (98.85 km/h)
70 mph (112.65 km/h)66.14 mph (106.45 km/h)
75 mph (120.7 km/h)70.87 mph (114.05 km/h)
80 mph (128.75 km/h)75.59 mph (121.66 km/h)
85 mph (136.79 km/h)80.32 mph (129.26 km/h)
90 mph (144.84 km/h)85.04 mph (136.86 km/h)
95 mph (152.89 km/h)89.77 mph (144.47 km/h)
100 mph (160.93 km/h)94.49 mph (152.07 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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