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 195/55r15 Tire Comparison Side By Side
  175/60-15 195/55-15 Difference
Diameter inches (mm) 23.27 (591) 23.44 (595.5) 0.18 (4.5) 0.8%
Width inches (mm) 6.89 (175) 7.68 (195) 0.79 (20) 11.4%
Circum. inches (mm) 73.1 (1856.68) 73.65 (1870.82) 0.56 (14.14) 0.8%
Sidewall Height inches (mm) 4.13 (105) 4.22 (107.25) 0.09 (2.25) 2.1%
Revolutions per mile (km) 866.79 (538.59) 860.24 (534.52) -6.55 (-4.07) -0.8%

Speedometer Difference

Speedo Reading Actual Speed
20 mph (32.19 km/h)20.15 mph (32.43 km/h)
25 mph (40.23 km/h)25.19 mph (40.54 km/h)
30 mph (48.28 km/h)30.23 mph (48.65 km/h)
35 mph (56.33 km/h)35.27 mph (56.76 km/h)
40 mph (64.37 km/h)40.3 mph (64.86 km/h)
45 mph (72.42 km/h)45.34 mph (72.97 km/h)
50 mph (80.47 km/h)50.38 mph (81.08 km/h)
55 mph (88.51 km/h)55.42 mph (89.19 km/h)
60 mph (96.56 km/h)60.46 mph (97.3 km/h)
65 mph (104.61 km/h)65.49 mph (105.4 km/h)
70 mph (112.65 km/h)70.53 mph (113.51 km/h)
75 mph (120.7 km/h)75.57 mph (121.62 km/h)
80 mph (128.75 km/h)80.61 mph (129.73 km/h)
85 mph (136.79 km/h)85.65 mph (137.84 km/h)
90 mph (144.84 km/h)90.69 mph (145.94 km/h)
95 mph (152.89 km/h)95.72 mph (154.05 km/h)
100 mph (160.93 km/h)100.76 mph (162.16 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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