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 175/65r14 Tire Comparison Side By Side
  175/80-14 175/65-14 Difference
Diameter inches (mm) 25.02 (635.6) 22.96 (583.1) -2.07 (-52.5) -8.3%
Width inches (mm) 6.89 (175) 6.89 (175) 0 (0) 0%
Circum. inches (mm) 78.61 (1996.8) 72.12 (1831.86) -6.49 (-164.93) -8.3%
Sidewall Height inches (mm) 5.51 (140) 4.48 (113.75) -1.03 (-26.25) -18.8%
Revolutions per mile (km) 805.96 (500.8) 878.53 (545.89) 72.57 (45.09) 9%

Speedometer Difference

Speedo Reading Actual Speed
20 mph (32.19 km/h)18.35 mph (29.53 km/h)
25 mph (40.23 km/h)22.94 mph (36.91 km/h)
30 mph (48.28 km/h)27.52 mph (44.29 km/h)
35 mph (56.33 km/h)32.11 mph (51.67 km/h)
40 mph (64.37 km/h)36.7 mph (59.06 km/h)
45 mph (72.42 km/h)41.28 mph (66.44 km/h)
50 mph (80.47 km/h)45.87 mph (73.82 km/h)
55 mph (88.51 km/h)50.46 mph (81.2 km/h)
60 mph (96.56 km/h)55.04 mph (88.58 km/h)
65 mph (104.61 km/h)59.63 mph (95.97 km/h)
70 mph (112.65 km/h)64.22 mph (103.35 km/h)
75 mph (120.7 km/h)68.81 mph (110.73 km/h)
80 mph (128.75 km/h)73.39 mph (118.11 km/h)
85 mph (136.79 km/h)77.98 mph (125.5 km/h)
90 mph (144.84 km/h)82.57 mph (132.88 km/h)
95 mph (152.89 km/h)87.15 mph (140.26 km/h)
100 mph (160.93 km/h)91.74 mph (147.64 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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