Tire Size Calculator

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Stock Sizes

  • 255/75-16

Plus Sizes

  • 255/75-16

Accepts P-Metric and Inches
/ R
/ R
185/55r15 vs 175/60r15 Tire Comparison Side By Side
  185/55-15 175/60-15 Difference
Diameter inches (mm) 23.01 (584.5) 23.27 (591) 0.26 (6.5) 1.1%
Width inches (mm) 7.28 (185) 6.89 (175) -0.39 (-10) -5.4%
Circum. inches (mm) 72.29 (1836.26) 73.1 (1856.68) 0.8 (20.42) 1.1%
Sidewall Height inches (mm) 4.01 (101.75) 4.13 (105) 0.13 (3.25) 3.2%
Revolutions per mile (km) 876.42 (544.58) 866.79 (538.59) -9.64 (-5.99) -1.1%

Speedometer Difference

Speedo Reading Actual Speed
20 mph (32.19 km/h)20.22 mph (32.54 km/h)
25 mph (40.23 km/h)25.28 mph (40.68 km/h)
30 mph (48.28 km/h)30.33 mph (48.82 km/h)
35 mph (56.33 km/h)35.39 mph (56.95 km/h)
40 mph (64.37 km/h)40.44 mph (65.09 km/h)
45 mph (72.42 km/h)45.5 mph (73.23 km/h)
50 mph (80.47 km/h)50.56 mph (81.36 km/h)
55 mph (88.51 km/h)55.61 mph (89.5 km/h)
60 mph (96.56 km/h)60.67 mph (97.63 km/h)
65 mph (104.61 km/h)65.72 mph (105.77 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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