Tire Size Calculator

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Stock Sizes

  • 255/75-16

Plus Sizes

  • 255/75-16

Accepts P-Metric and Inches
/ R
/ R
175/80r14 vs 185/70r14 Tire Comparison Side By Side
  175/80-14 185/70-14 Difference
Diameter inches (mm) 25.02 (635.6) 24.2 (614.6) -0.83 (-21) -3.3%
Width inches (mm) 6.89 (175) 7.28 (185) 0.39 (10) 5.7%
Circum. inches (mm) 78.61 (1996.8) 76.02 (1930.82) -2.6 (-65.97) -3.3%
Sidewall Height inches (mm) 5.51 (140) 5.1 (129.5) -0.41 (-10.5) -7.5%
Revolutions per mile (km) 805.96 (500.8) 833.5 (517.91) 27.54 (17.11) 3.4%

Speedometer Difference

Speedo Reading Actual Speed
20 mph (32.19 km/h)19.34 mph (31.12 km/h)
25 mph (40.23 km/h)24.17 mph (38.9 km/h)
30 mph (48.28 km/h)29.01 mph (46.69 km/h)
35 mph (56.33 km/h)33.84 mph (54.47 km/h)
40 mph (64.37 km/h)38.68 mph (62.25 km/h)
45 mph (72.42 km/h)43.51 mph (70.03 km/h)
50 mph (80.47 km/h)48.35 mph (77.81 km/h)
55 mph (88.51 km/h)53.18 mph (85.59 km/h)
60 mph (96.56 km/h)58.02 mph (93.37 km/h)
65 mph (104.61 km/h)62.85 mph (101.15 km/h)
70 mph (112.65 km/h)67.69 mph (108.93 km/h)
75 mph (120.7 km/h)72.52 mph (116.71 km/h)
80 mph (128.75 km/h)77.36 mph (124.49 km/h)
85 mph (136.79 km/h)82.19 mph (132.27 km/h)
90 mph (144.84 km/h)87.03 mph (140.06 km/h)
95 mph (152.89 km/h)91.86 mph (147.84 km/h)
100 mph (160.93 km/h)96.7 mph (155.62 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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