Tire Size Calculator

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Stock Sizes

  • 255/75-16

Plus Sizes

  • 255/75-16

Accepts P-Metric and Inches
/ R
/ R
175/55r14 vs 175/65r14 Tire Comparison Side By Side
  175/55-14 175/65-14 Difference
Diameter inches (mm) 21.58 (548.1) 22.96 (583.1) 1.38 (35) 6.4%
Width inches (mm) 6.89 (175) 6.89 (175) 0 (0) 0%
Circum. inches (mm) 67.79 (1721.91) 72.12 (1831.86) 4.33 (109.96) 6.4%
Sidewall Height inches (mm) 3.79 (96.25) 4.48 (113.75) 0.69 (17.5) 18.2%
Revolutions per mile (km) 934.63 (580.75) 878.53 (545.89) -56.1 (-34.86) -6%

Speedometer Difference

Speedo Reading Actual Speed
20 mph (32.19 km/h)21.28 mph (34.24 km/h)
25 mph (40.23 km/h)26.6 mph (42.8 km/h)
30 mph (48.28 km/h)31.92 mph (51.36 km/h)
35 mph (56.33 km/h)37.23 mph (59.92 km/h)
40 mph (64.37 km/h)42.55 mph (68.48 km/h)
45 mph (72.42 km/h)47.87 mph (77.05 km/h)
50 mph (80.47 km/h)53.19 mph (85.61 km/h)
55 mph (88.51 km/h)58.51 mph (94.17 km/h)
60 mph (96.56 km/h)63.83 mph (102.73 km/h)
65 mph (104.61 km/h)69.15 mph (111.29 km/h)
70 mph (112.65 km/h)74.47 mph (119.85 km/h)
75 mph (120.7 km/h)79.79 mph (128.41 km/h)
80 mph (128.75 km/h)85.11 mph (136.97 km/h)
85 mph (136.79 km/h)90.43 mph (145.53 km/h)
90 mph (144.84 km/h)95.75 mph (154.09 km/h)
95 mph (152.89 km/h)101.07 mph (162.65 km/h)
100 mph (160.93 km/h)106.39 mph (171.21 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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