Tire Size Calculator

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Stock Sizes

  • 255/75-16

Plus Sizes

  • 255/75-16

Accepts P-Metric and Inches
/ R
/ R
165/60r12 vs 165/55r12 Tire Comparison Side By Side
  165/60-12 165/55-12 Difference
Diameter inches (mm) 19.8 (502.8) 19.15 (486.3) -0.65 (-16.5) -3.3%
Width inches (mm) 6.5 (165) 6.5 (165) 0 (0) 0%
Circum. inches (mm) 62.19 (1579.59) 60.15 (1527.76) -2.04 (-51.84) -3.3%
Sidewall Height inches (mm) 3.9 (99) 3.57 (90.75) -0.32 (-8.25) -8.3%
Revolutions per mile (km) 1018.83 (633.07) 1053.4 (654.55) 34.57 (21.48) 3.4%

Speedometer Difference

Speedo Reading Actual Speed
20 mph (32.19 km/h)19.34 mph (31.13 km/h)
25 mph (40.23 km/h)24.18 mph (38.91 km/h)
30 mph (48.28 km/h)29.02 mph (46.7 km/h)
35 mph (56.33 km/h)33.85 mph (54.48 km/h)
40 mph (64.37 km/h)38.69 mph (62.26 km/h)
45 mph (72.42 km/h)43.52 mph (70.04 km/h)
50 mph (80.47 km/h)48.36 mph (77.83 km/h)
55 mph (88.51 km/h)53.2 mph (85.61 km/h)
60 mph (96.56 km/h)58.03 mph (93.39 km/h)
65 mph (104.61 km/h)62.87 mph (101.17 km/h)
70 mph (112.65 km/h)67.7 mph (108.96 km/h)
75 mph (120.7 km/h)72.54 mph (116.74 km/h)
80 mph (128.75 km/h)77.37 mph (124.52 km/h)
85 mph (136.79 km/h)82.21 mph (132.31 km/h)
90 mph (144.84 km/h)87.05 mph (140.09 km/h)
95 mph (152.89 km/h)91.88 mph (147.87 km/h)
100 mph (160.93 km/h)96.72 mph (155.65 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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