Tire Size Calculator

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Stock Sizes

  • 255/75-16

Plus Sizes

  • 255/75-16

Accepts P-Metric and Inches
/ R
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165/60r12 vs 155/60r12 Tire Comparison Side By Side
  165/60-12 155/60-12 Difference
Diameter inches (mm) 19.8 (502.8) 19.32 (490.8) -0.47 (-12) -2.4%
Width inches (mm) 6.5 (165) 6.1 (155) -0.39 (-10) -6.1%
Circum. inches (mm) 62.19 (1579.59) 60.7 (1541.89) -1.48 (-37.7) -2.4%
Sidewall Height inches (mm) 3.9 (99) 3.66 (93) -0.24 (-6) -6.1%
Revolutions per mile (km) 1018.83 (633.07) 1043.75 (648.55) 24.91 (15.48) 2.4%

Speedometer Difference

Speedo Reading Actual Speed
20 mph (32.19 km/h)19.52 mph (31.42 km/h)
25 mph (40.23 km/h)24.4 mph (39.27 km/h)
30 mph (48.28 km/h)29.28 mph (47.13 km/h)
35 mph (56.33 km/h)34.16 mph (54.98 km/h)
40 mph (64.37 km/h)39.05 mph (62.84 km/h)
45 mph (72.42 km/h)43.93 mph (70.69 km/h)
50 mph (80.47 km/h)48.81 mph (78.55 km/h)
55 mph (88.51 km/h)53.69 mph (86.4 km/h)
60 mph (96.56 km/h)58.57 mph (94.26 km/h)
65 mph (104.61 km/h)63.45 mph (102.11 km/h)
70 mph (112.65 km/h)68.33 mph (109.97 km/h)
75 mph (120.7 km/h)73.21 mph (117.82 km/h)
80 mph (128.75 km/h)78.09 mph (125.68 km/h)
85 mph (136.79 km/h)82.97 mph (133.53 km/h)
90 mph (144.84 km/h)87.85 mph (141.38 km/h)
95 mph (152.89 km/h)92.73 mph (149.24 km/h)
100 mph (160.93 km/h)97.61 mph (157.09 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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