Tire Size Calculator

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Stock Sizes

  • 255/75-16

Plus Sizes

  • 255/75-16

Accepts P-Metric and Inches
/ R
/ R
225/45r17 vs 225/45r19 Tire Comparison Side By Side
  225/45-17 225/45-19 Difference
Diameter inches (mm) 24.97 (634.3) 26.97 (685.1) 2 (50.8) 8%
Width inches (mm) 8.86 (225) 8.86 (225) 0 (0) 0%
Circum. inches (mm) 78.45 (1992.71) 84.74 (2152.31) 6.28 (159.59) 8%
Sidewall Height inches (mm) 3.99 (101.25) 3.99 (101.25) 0 (0) 0%
Revolutions per mile (km) 807.61 (501.83) 747.73 (464.62) -59.88 (-37.21) -7.4%

Speedometer Difference

Speedo Reading Actual Speed
20 mph (32.19 km/h)21.6 mph (34.76 km/h)
25 mph (40.23 km/h)27 mph (43.46 km/h)
30 mph (48.28 km/h)32.4 mph (52.15 km/h)
35 mph (56.33 km/h)37.8 mph (60.84 km/h)
40 mph (64.37 km/h)43.2 mph (69.53 km/h)
45 mph (72.42 km/h)48.6 mph (78.22 km/h)
50 mph (80.47 km/h)54 mph (86.91 km/h)
55 mph (88.51 km/h)59.4 mph (95.6 km/h)
60 mph (96.56 km/h)64.81 mph (104.29 km/h)
65 mph (104.61 km/h)70.21 mph (112.99 km/h)
70 mph (112.65 km/h)75.61 mph (121.68 km/h)
75 mph (120.7 km/h)81.01 mph (130.37 km/h)
80 mph (128.75 km/h)86.41 mph (139.06 km/h)
85 mph (136.79 km/h)91.81 mph (147.75 km/h)
90 mph (144.84 km/h)97.21 mph (156.44 km/h)
95 mph (152.89 km/h)102.61 mph (165.13 km/h)
100 mph (160.93 km/h)108.01 mph (173.82 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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