Tire Size Calculator

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Stock Sizes

  • 255/75-16

Plus Sizes

  • 255/75-16

Accepts P-Metric and Inches
/ R
/ R
225/45r19 vs 255/50r17 Tire Comparison Side By Side
  225/45-19 255/50-17 Difference
Diameter inches (mm) 26.97 (685.1) 27.04 (686.8) 0.07 (1.7) 0.2%
Width inches (mm) 8.86 (225) 10.04 (255) 1.18 (30) 13.3%
Circum. inches (mm) 84.74 (2152.31) 84.95 (2157.65) 0.21 (5.34) 0.2%
Sidewall Height inches (mm) 3.99 (101.25) 5.02 (127.5) 1.03 (26.25) 25.9%
Revolutions per mile (km) 747.73 (464.62) 745.88 (463.47) -1.85 (-1.15) -0.2%

Speedometer Difference

Speedo Reading Actual Speed
20 mph (32.19 km/h)20.05 mph (32.27 km/h)
25 mph (40.23 km/h)25.06 mph (40.33 km/h)
30 mph (48.28 km/h)30.07 mph (48.4 km/h)
35 mph (56.33 km/h)35.09 mph (56.47 km/h)
40 mph (64.37 km/h)40.1 mph (64.53 km/h)
45 mph (72.42 km/h)45.11 mph (72.6 km/h)
50 mph (80.47 km/h)50.12 mph (80.67 km/h)
55 mph (88.51 km/h)55.14 mph (88.73 km/h)
60 mph (96.56 km/h)60.15 mph (96.8 km/h)
65 mph (104.61 km/h)65.16 mph (104.87 km/h)
70 mph (112.65 km/h)70.17 mph (112.93 km/h)
75 mph (120.7 km/h)75.19 mph (121 km/h)
80 mph (128.75 km/h)80.2 mph (129.07 km/h)
85 mph (136.79 km/h)85.21 mph (137.13 km/h)
90 mph (144.84 km/h)90.22 mph (145.2 km/h)
95 mph (152.89 km/h)95.24 mph (153.27 km/h)
100 mph (160.93 km/h)100.25 mph (161.33 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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