Tire Size Calculator

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Stock Sizes

  • 255/75-16

Plus Sizes

  • 255/75-16

Accepts P-Metric and Inches
/ R
/ R
175/50r13 vs 175/70r13 Tire Comparison Side By Side
  175/50-13 175/70-13 Difference
Diameter inches (mm) 19.89 (505.2) 22.65 (575.2) 2.76 (70) 13.9%
Width inches (mm) 6.89 (175) 6.89 (175) 0 (0) 0%
Circum. inches (mm) 62.49 (1587.13) 71.14 (1807.04) 8.66 (219.91) 13.9%
Sidewall Height inches (mm) 3.44 (87.5) 4.82 (122.5) 1.38 (35) 40%
Revolutions per mile (km) 1013.99 (630.07) 890.59 (553.39) -123.4 (-76.68) -12.2%

Speedometer Difference

Speedo Reading Actual Speed
20 mph (32.19 km/h)22.77 mph (36.65 km/h)
25 mph (40.23 km/h)28.46 mph (45.81 km/h)
30 mph (48.28 km/h)34.16 mph (54.97 km/h)
35 mph (56.33 km/h)39.85 mph (64.13 km/h)
40 mph (64.37 km/h)45.54 mph (73.29 km/h)
45 mph (72.42 km/h)51.24 mph (82.46 km/h)
50 mph (80.47 km/h)56.93 mph (91.62 km/h)
55 mph (88.51 km/h)62.62 mph (100.78 km/h)
60 mph (96.56 km/h)68.31 mph (109.94 km/h)
65 mph (104.61 km/h)74.01 mph (119.1 km/h)
70 mph (112.65 km/h)79.7 mph (128.26 km/h)
75 mph (120.7 km/h)85.39 mph (137.43 km/h)
80 mph (128.75 km/h)91.08 mph (146.59 km/h)
85 mph (136.79 km/h)96.78 mph (155.75 km/h)
90 mph (144.84 km/h)102.47 mph (164.91 km/h)
95 mph (152.89 km/h)108.16 mph (174.07 km/h)
100 mph (160.93 km/h)113.86 mph (183.23 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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