Tire Size Calculator

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Stock Sizes

  • 255/75-16

Plus Sizes

  • 255/75-16

Accepts P-Metric and Inches
/ R
/ R
175/70r13 vs 175/60r15 Tire Comparison Side By Side
  175/70-13 175/60-15 Difference
Diameter inches (mm) 22.65 (575.2) 23.27 (591) 0.62 (15.8) 2.7%
Width inches (mm) 6.89 (175) 6.89 (175) 0 (0) 0%
Circum. inches (mm) 71.14 (1807.04) 73.1 (1856.68) 1.95 (49.64) 2.7%
Sidewall Height inches (mm) 4.82 (122.5) 4.13 (105) -0.69 (-17.5) -14.3%
Revolutions per mile (km) 890.59 (553.39) 866.79 (538.59) -23.81 (-14.79) -2.7%

Speedometer Difference

Speedo Reading Actual Speed
20 mph (32.19 km/h)20.55 mph (33.07 km/h)
25 mph (40.23 km/h)25.69 mph (41.34 km/h)
30 mph (48.28 km/h)30.82 mph (49.61 km/h)
35 mph (56.33 km/h)35.96 mph (57.87 km/h)
40 mph (64.37 km/h)41.1 mph (66.14 km/h)
45 mph (72.42 km/h)46.24 mph (74.41 km/h)
50 mph (80.47 km/h)51.37 mph (82.68 km/h)
55 mph (88.51 km/h)56.51 mph (90.95 km/h)
60 mph (96.56 km/h)61.65 mph (99.21 km/h)
65 mph (104.61 km/h)66.79 mph (107.48 km/h)
70 mph (112.65 km/h)71.92 mph (115.75 km/h)
75 mph (120.7 km/h)77.06 mph (124.02 km/h)
80 mph (128.75 km/h)82.2 mph (132.28 km/h)
85 mph (136.79 km/h)87.33 mph (140.55 km/h)
90 mph (144.84 km/h)92.47 mph (148.82 km/h)
95 mph (152.89 km/h)97.61 mph (157.09 km/h)
100 mph (160.93 km/h)102.75 mph (165.36 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
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