Tire Size Calculator

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Stock Sizes

  • 255/75-16

Plus Sizes

  • 255/75-16

Accepts P-Metric and Inches
/ R
/ R
165/55r12 vs 155/60r12 Tire Comparison Side By Side
  165/55-12 155/60-12 Difference
Diameter inches (mm) 19.15 (486.3) 19.32 (490.8) 0.18 (4.5) 0.9%
Width inches (mm) 6.5 (165) 6.1 (155) -0.39 (-10) -6.1%
Circum. inches (mm) 60.15 (1527.76) 60.7 (1541.89) 0.56 (14.14) 0.9%
Sidewall Height inches (mm) 3.57 (90.75) 3.66 (93) 0.09 (2.25) 2.5%
Revolutions per mile (km) 1053.4 (654.55) 1043.75 (648.55) -9.66 (-6) -0.9%

Speedometer Difference

Speedo Reading Actual Speed
20 mph (32.19 km/h)20.19 mph (32.48 km/h)
25 mph (40.23 km/h)25.23 mph (40.61 km/h)
30 mph (48.28 km/h)30.28 mph (48.73 km/h)
35 mph (56.33 km/h)35.32 mph (56.85 km/h)
40 mph (64.37 km/h)40.37 mph (64.97 km/h)
45 mph (72.42 km/h)45.42 mph (73.09 km/h)
50 mph (80.47 km/h)50.46 mph (81.21 km/h)
55 mph (88.51 km/h)55.51 mph (89.33 km/h)
60 mph (96.56 km/h)60.56 mph (97.45 km/h)
65 mph (104.61 km/h)65.6 mph (105.58 km/h)
70 mph (112.65 km/h)70.65 mph (113.7 km/h)
75 mph (120.7 km/h)75.69 mph (121.82 km/h)
80 mph (128.75 km/h)80.74 mph (129.94 km/h)
85 mph (136.79 km/h)85.79 mph (138.06 km/h)
90 mph (144.84 km/h)90.83 mph (146.18 km/h)
95 mph (152.89 km/h)95.88 mph (154.3 km/h)
100 mph (160.93 km/h)100.93 mph (162.42 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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