Tire Size Calculator

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Stock Sizes

  • 255/75-16

Plus Sizes

  • 255/75-16

Accepts P-Metric and Inches
/ R
/ R
145/60r13 vs 155/60r13 Tire Comparison Side By Side
  145/60-13 155/60-13 Difference
Diameter inches (mm) 19.85 (504.2) 20.32 (516.2) 0.47 (12) 2.4%
Width inches (mm) 5.71 (145) 6.1 (155) 0.39 (10) 6.9%
Circum. inches (mm) 62.36 (1583.99) 63.85 (1621.69) 1.48 (37.7) 2.4%
Sidewall Height inches (mm) 3.43 (87) 3.66 (93) 0.24 (6) 6.9%
Revolutions per mile (km) 1016.01 (631.32) 992.39 (616.64) -23.62 (-14.68) -2.3%

Speedometer Difference

Speedo Reading Actual Speed
20 mph (32.19 km/h)20.48 mph (32.95 km/h)
25 mph (40.23 km/h)25.6 mph (41.19 km/h)
30 mph (48.28 km/h)30.71 mph (49.43 km/h)
35 mph (56.33 km/h)35.83 mph (57.67 km/h)
40 mph (64.37 km/h)40.95 mph (65.91 km/h)
45 mph (72.42 km/h)46.07 mph (74.14 km/h)
50 mph (80.47 km/h)51.19 mph (82.38 km/h)
55 mph (88.51 km/h)56.31 mph (90.62 km/h)
60 mph (96.56 km/h)61.43 mph (98.86 km/h)
65 mph (104.61 km/h)66.55 mph (107.1 km/h)
70 mph (112.65 km/h)71.67 mph (115.34 km/h)
75 mph (120.7 km/h)76.79 mph (123.57 km/h)
80 mph (128.75 km/h)81.9 mph (131.81 km/h)
85 mph (136.79 km/h)87.02 mph (140.05 km/h)
90 mph (144.84 km/h)92.14 mph (148.29 km/h)
95 mph (152.89 km/h)97.26 mph (156.53 km/h)
100 mph (160.93 km/h)102.38 mph (164.76 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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