Tire Size Calculator

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Stock Sizes

  • 255/75-16

Plus Sizes

  • 255/75-16

Accepts P-Metric and Inches
/ R
/ R
175/60r13 vs 175/70r13 Tire Comparison Side By Side
  175/60-13 175/70-13 Difference
Diameter inches (mm) 21.27 (540.2) 22.65 (575.2) 1.38 (35) 6.5%
Width inches (mm) 6.89 (175) 6.89 (175) 0 (0) 0%
Circum. inches (mm) 66.81 (1697.09) 71.14 (1807.04) 4.33 (109.96) 6.5%
Sidewall Height inches (mm) 4.13 (105) 4.82 (122.5) 0.69 (17.5) 16.7%
Revolutions per mile (km) 948.3 (589.24) 890.59 (553.39) -57.7 (-35.85) -6.1%

Speedometer Difference

Speedo Reading Actual Speed
20 mph (32.19 km/h)21.3 mph (34.27 km/h)
25 mph (40.23 km/h)26.62 mph (42.84 km/h)
30 mph (48.28 km/h)31.94 mph (51.41 km/h)
35 mph (56.33 km/h)37.27 mph (59.98 km/h)
40 mph (64.37 km/h)42.59 mph (68.54 km/h)
45 mph (72.42 km/h)47.92 mph (77.11 km/h)
50 mph (80.47 km/h)53.24 mph (85.68 km/h)
55 mph (88.51 km/h)58.56 mph (94.25 km/h)
60 mph (96.56 km/h)63.89 mph (102.82 km/h)
65 mph (104.61 km/h)69.21 mph (111.39 km/h)
70 mph (112.65 km/h)74.54 mph (119.95 km/h)
75 mph (120.7 km/h)79.86 mph (128.52 km/h)
80 mph (128.75 km/h)85.18 mph (137.09 km/h)
85 mph (136.79 km/h)90.51 mph (145.66 km/h)
90 mph (144.84 km/h)95.83 mph (154.23 km/h)
95 mph (152.89 km/h)101.16 mph (162.79 km/h)
100 mph (160.93 km/h)106.48 mph (171.36 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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