Tire Size Calculator

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Stock Sizes

  • 255/75-16

Plus Sizes

  • 255/75-16

Accepts P-Metric and Inches
/ R
/ R
175/60r15 vs 195/60r15 Tire Comparison Side By Side
  175/60-15 195/60-15 Difference
Diameter inches (mm) 23.27 (591) 24.21 (615) 0.94 (24) 4.1%
Width inches (mm) 6.89 (175) 7.68 (195) 0.79 (20) 11.4%
Circum. inches (mm) 73.1 (1856.68) 76.07 (1932.08) 2.97 (75.4) 4.1%
Sidewall Height inches (mm) 4.13 (105) 4.61 (117) 0.47 (12) 11.4%
Revolutions per mile (km) 866.79 (538.59) 832.96 (517.58) -33.83 (-21.02) -3.9%

Speedometer Difference

Speedo Reading Actual Speed
20 mph (32.19 km/h)20.81 mph (33.49 km/h)
25 mph (40.23 km/h)26.02 mph (41.87 km/h)
30 mph (48.28 km/h)31.22 mph (50.24 km/h)
35 mph (56.33 km/h)36.42 mph (58.61 km/h)
40 mph (64.37 km/h)41.62 mph (66.99 km/h)
45 mph (72.42 km/h)46.83 mph (75.36 km/h)
50 mph (80.47 km/h)52.03 mph (83.74 km/h)
55 mph (88.51 km/h)57.23 mph (92.11 km/h)
60 mph (96.56 km/h)62.44 mph (100.48 km/h)
65 mph (104.61 km/h)67.64 mph (108.86 km/h)
70 mph (112.65 km/h)72.84 mph (117.23 km/h)
75 mph (120.7 km/h)78.05 mph (125.6 km/h)
80 mph (128.75 km/h)83.25 mph (133.98 km/h)
85 mph (136.79 km/h)88.45 mph (142.35 km/h)
90 mph (144.84 km/h)93.65 mph (150.72 km/h)
95 mph (152.89 km/h)98.86 mph (159.1 km/h)
100 mph (160.93 km/h)104.06 mph (167.47 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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