Tire Size Calculator

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Stock Sizes

  • 255/75-16

Plus Sizes

  • 255/75-16

Accepts P-Metric and Inches
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165/55r13 vs 155/65r13 Tire Comparison Side By Side
  165/55-13 155/65-13 Difference
Diameter inches (mm) 20.15 (511.7) 20.93 (531.7) 0.79 (20) 3.9%
Width inches (mm) 6.5 (165) 6.1 (155) -0.39 (-10) -6.1%
Circum. inches (mm) 63.29 (1607.55) 65.76 (1670.38) 2.47 (62.83) 3.9%
Sidewall Height inches (mm) 3.57 (90.75) 3.97 (100.75) 0.39 (10) 11%
Revolutions per mile (km) 1001.11 (622.06) 963.46 (598.66) -37.66 (-23.4) -3.8%

Speedometer Difference

Speedo Reading Actual Speed
20 mph (32.19 km/h)20.78 mph (33.44 km/h)
25 mph (40.23 km/h)25.98 mph (41.81 km/h)
30 mph (48.28 km/h)31.17 mph (50.17 km/h)
35 mph (56.33 km/h)36.37 mph (58.53 km/h)
40 mph (64.37 km/h)41.56 mph (66.89 km/h)
45 mph (72.42 km/h)46.76 mph (75.25 km/h)
50 mph (80.47 km/h)51.95 mph (83.61 km/h)
55 mph (88.51 km/h)57.15 mph (91.97 km/h)
60 mph (96.56 km/h)62.35 mph (100.33 km/h)
65 mph (104.61 km/h)67.54 mph (108.7 km/h)
70 mph (112.65 km/h)72.74 mph (117.06 km/h)
75 mph (120.7 km/h)77.93 mph (125.42 km/h)
80 mph (128.75 km/h)83.13 mph (133.78 km/h)
85 mph (136.79 km/h)88.32 mph (142.14 km/h)
90 mph (144.84 km/h)93.52 mph (150.5 km/h)
95 mph (152.89 km/h)98.71 mph (158.86 km/h)
100 mph (160.93 km/h)103.91 mph (167.22 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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