Tire Size Calculator

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Stock Sizes

  • 255/75-16

Plus Sizes

  • 255/75-16

Accepts P-Metric and Inches
/ R
/ R
185/60r14 vs 165/75r14 Tire Comparison Side By Side
  185/60-14 165/75-14 Difference
Diameter inches (mm) 22.74 (577.6) 23.74 (603.1) 1 (25.5) 4.4%
Width inches (mm) 7.28 (185) 6.5 (165) -0.79 (-20) -10.8%
Circum. inches (mm) 71.44 (1814.58) 74.59 (1894.69) 3.15 (80.11) 4.4%
Sidewall Height inches (mm) 4.37 (111) 4.87 (123.75) 0.5 (12.75) 11.5%
Revolutions per mile (km) 886.89 (551.09) 849.39 (527.79) -37.5 (-23.3) -4.2%

Speedometer Difference

Speedo Reading Actual Speed
20 mph (32.19 km/h)20.88 mph (33.61 km/h)
25 mph (40.23 km/h)26.1 mph (42.01 km/h)
30 mph (48.28 km/h)31.32 mph (50.41 km/h)
35 mph (56.33 km/h)36.55 mph (58.81 km/h)
40 mph (64.37 km/h)41.77 mph (67.22 km/h)
45 mph (72.42 km/h)46.99 mph (75.62 km/h)
50 mph (80.47 km/h)52.21 mph (84.02 km/h)
55 mph (88.51 km/h)57.43 mph (92.42 km/h)
60 mph (96.56 km/h)62.65 mph (100.82 km/h)
65 mph (104.61 km/h)67.87 mph (109.23 km/h)
70 mph (112.65 km/h)73.09 mph (117.63 km/h)
75 mph (120.7 km/h)78.31 mph (126.03 km/h)
80 mph (128.75 km/h)83.53 mph (134.43 km/h)
85 mph (136.79 km/h)88.75 mph (142.83 km/h)
90 mph (144.84 km/h)93.97 mph (151.24 km/h)
95 mph (152.89 km/h)99.19 mph (159.64 km/h)
100 mph (160.93 km/h)104.41 mph (168.04 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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