Tire Size Calculator

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Stock Sizes

  • 255/75-16

Plus Sizes

  • 255/75-16

Accepts P-Metric and Inches
/ R
/ R
225/60r14 vs 215/70r14 Tire Comparison Side By Side
  225/60-14 215/70-14 Difference
Diameter inches (mm) 24.63 (625.6) 25.85 (656.6) 1.22 (31) 5%
Width inches (mm) 8.86 (225) 8.46 (215) -0.39 (-10) -4.4%
Circum. inches (mm) 77.38 (1965.38) 81.21 (2062.77) 3.83 (97.39) 5%
Sidewall Height inches (mm) 5.31 (135) 5.93 (150.5) 0.61 (15.5) 11.5%
Revolutions per mile (km) 818.85 (508.81) 780.19 (484.78) -38.66 (-24.02) -4.7%

Speedometer Difference

Speedo Reading Actual Speed
20 mph (32.19 km/h)20.99 mph (33.78 km/h)
25 mph (40.23 km/h)26.24 mph (42.23 km/h)
30 mph (48.28 km/h)31.49 mph (50.67 km/h)
35 mph (56.33 km/h)36.73 mph (59.12 km/h)
40 mph (64.37 km/h)41.98 mph (67.56 km/h)
45 mph (72.42 km/h)47.23 mph (76.01 km/h)
50 mph (80.47 km/h)52.48 mph (84.45 km/h)
55 mph (88.51 km/h)57.73 mph (92.9 km/h)
60 mph (96.56 km/h)62.97 mph (101.35 km/h)
65 mph (104.61 km/h)68.22 mph (109.79 km/h)
70 mph (112.65 km/h)73.47 mph (118.24 km/h)
75 mph (120.7 km/h)78.72 mph (126.68 km/h)
80 mph (128.75 km/h)83.96 mph (135.13 km/h)
85 mph (136.79 km/h)89.21 mph (143.57 km/h)
90 mph (144.84 km/h)94.46 mph (152.02 km/h)
95 mph (152.89 km/h)99.71 mph (160.46 km/h)
100 mph (160.93 km/h)104.96 mph (168.91 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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