Tire Size Calculator

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Stock Sizes

  • 255/75-16

Plus Sizes

  • 255/75-16

Accepts P-Metric and Inches
/ R
/ R
175/60r19 vs 165/80r18 Tire Comparison Side By Side
  175/60-19 165/80-18 Difference
Diameter inches (mm) 27.27 (692.6) 28.39 (721.2) 1.13 (28.6) 4.1%
Width inches (mm) 6.89 (175) 6.5 (165) -0.39 (-10) -5.7%
Circum. inches (mm) 85.66 (2175.87) 89.2 (2265.72) 3.54 (89.85) 4.1%
Sidewall Height inches (mm) 4.13 (105) 5.2 (132) 1.06 (27) 25.7%
Revolutions per mile (km) 739.63 (459.59) 710.3 (441.36) -29.33 (-18.23) -4%

Speedometer Difference

Speedo Reading Actual Speed
20 mph (32.19 km/h)20.83 mph (33.52 km/h)
25 mph (40.23 km/h)26.03 mph (41.9 km/h)
30 mph (48.28 km/h)31.24 mph (50.27 km/h)
35 mph (56.33 km/h)36.45 mph (58.65 km/h)
40 mph (64.37 km/h)41.65 mph (67.03 km/h)
45 mph (72.42 km/h)46.86 mph (75.41 km/h)
50 mph (80.47 km/h)52.06 mph (83.79 km/h)
55 mph (88.51 km/h)57.27 mph (92.17 km/h)
60 mph (96.56 km/h)62.48 mph (100.55 km/h)
65 mph (104.61 km/h)67.68 mph (108.93 km/h)
70 mph (112.65 km/h)72.89 mph (117.31 km/h)
75 mph (120.7 km/h)78.1 mph (125.69 km/h)
80 mph (128.75 km/h)83.3 mph (134.06 km/h)
85 mph (136.79 km/h)88.51 mph (142.44 km/h)
90 mph (144.84 km/h)93.72 mph (150.82 km/h)
95 mph (152.89 km/h)98.92 mph (159.2 km/h)
100 mph (160.93 km/h)104.13 mph (167.58 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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