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 175/70r14 Tire Comparison Side By Side
  175/80-14 175/70-14 Difference
Diameter inches (mm) 25.02 (635.6) 23.65 (600.6) -1.38 (-35) -5.5%
Width inches (mm) 6.89 (175) 6.89 (175) 0 (0) 0%
Circum. inches (mm) 78.61 (1996.8) 74.29 (1886.84) -4.33 (-109.96) -5.5%
Sidewall Height inches (mm) 5.51 (140) 4.82 (122.5) -0.69 (-17.5) -12.5%
Revolutions per mile (km) 805.96 (500.8) 852.93 (529.99) 46.97 (29.18) 5.8%

Speedometer Difference

Speedo Reading Actual Speed
20 mph (32.19 km/h)18.9 mph (30.41 km/h)
25 mph (40.23 km/h)23.62 mph (38.02 km/h)
30 mph (48.28 km/h)28.35 mph (45.62 km/h)
35 mph (56.33 km/h)33.07 mph (53.23 km/h)
40 mph (64.37 km/h)37.8 mph (60.83 km/h)
45 mph (72.42 km/h)42.52 mph (68.43 km/h)
50 mph (80.47 km/h)47.25 mph (76.04 km/h)
55 mph (88.51 km/h)51.97 mph (83.64 km/h)
60 mph (96.56 km/h)56.7 mph (91.24 km/h)
65 mph (104.61 km/h)61.42 mph (98.85 km/h)
70 mph (112.65 km/h)66.15 mph (106.45 km/h)
75 mph (120.7 km/h)70.87 mph (114.05 km/h)
80 mph (128.75 km/h)75.59 mph (121.66 km/h)
85 mph (136.79 km/h)80.32 mph (129.26 km/h)
90 mph (144.84 km/h)85.04 mph (136.87 km/h)
95 mph (152.89 km/h)89.77 mph (144.47 km/h)
100 mph (160.93 km/h)94.49 mph (152.07 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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