Tire Size Calculator

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Stock Sizes

  • 255/75-16

Plus Sizes

  • 255/75-16

Accepts P-Metric and Inches
/ R
/ R
185/65r14 vs 185/60r14 Tire Comparison Side By Side
  185/65-14 185/60-14 Difference
Diameter inches (mm) 23.47 (596.1) 22.74 (577.6) -0.73 (-18.5) -3.1%
Width inches (mm) 7.28 (185) 7.28 (185) 0 (0) 0%
Circum. inches (mm) 73.73 (1872.7) 71.44 (1814.58) -2.29 (-58.12) -3.1%
Sidewall Height inches (mm) 4.73 (120.25) 4.37 (111) -0.36 (-9.25) -7.7%
Revolutions per mile (km) 859.37 (533.99) 886.89 (551.09) 27.52 (17.1) 3.2%

Speedometer Difference

Speedo Reading Actual Speed
20 mph (32.19 km/h)19.38 mph (31.19 km/h)
25 mph (40.23 km/h)24.22 mph (38.99 km/h)
30 mph (48.28 km/h)29.07 mph (46.78 km/h)
35 mph (56.33 km/h)33.91 mph (54.58 km/h)
40 mph (64.37 km/h)38.76 mph (62.38 km/h)
45 mph (72.42 km/h)43.6 mph (70.17 km/h)
50 mph (80.47 km/h)48.45 mph (77.97 km/h)
55 mph (88.51 km/h)53.29 mph (85.77 km/h)
60 mph (96.56 km/h)58.14 mph (93.56 km/h)
65 mph (104.61 km/h)62.98 mph (101.36 km/h)
70 mph (112.65 km/h)67.83 mph (109.16 km/h)
75 mph (120.7 km/h)72.67 mph (116.96 km/h)
80 mph (128.75 km/h)77.52 mph (124.75 km/h)
85 mph (136.79 km/h)82.36 mph (132.55 km/h)
90 mph (144.84 km/h)87.21 mph (140.35 km/h)
95 mph (152.89 km/h)92.05 mph (148.14 km/h)
100 mph (160.93 km/h)96.9 mph (155.94 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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