Tire Size Calculator

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Stock Sizes

  • 255/75-16

Plus Sizes

  • 255/75-16

Accepts P-Metric and Inches
/ R
/ R
180/55r17 vs 205/50r17 Tire Comparison Side By Side
  180/55-17 205/50-17 Difference
Diameter inches (mm) 24.8 (629.8) 25.07 (636.8) 0.28 (7) 1.1%
Width inches (mm) 7.09 (180) 8.07 (205) 0.98 (25) 13.9%
Circum. inches (mm) 77.9 (1978.58) 78.76 (2000.57) 0.87 (21.99) 1.1%
Sidewall Height inches (mm) 3.9 (99) 4.04 (102.5) 0.14 (3.5) 3.5%
Revolutions per mile (km) 813.39 (505.41) 804.44 (499.86) -8.94 (-5.56) -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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