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 225/50r15 Tire Comparison Side By Side
  225/45-17 225/50-15 Difference
Diameter inches (mm) 24.97 (634.3) 23.86 (606) -1.11 (-28.3) -4.5%
Width inches (mm) 8.86 (225) 8.86 (225) 0 (0) 0%
Circum. inches (mm) 78.45 (1992.71) 74.95 (1903.81) -3.5 (-88.91) -4.5%
Sidewall Height inches (mm) 3.99 (101.25) 4.43 (112.5) 0.44 (11.25) 11.1%
Revolutions per mile (km) 807.61 (501.83) 845.33 (525.26) 37.72 (23.44) 4.7%

Speedometer Difference

Speedo Reading Actual Speed
20 mph (32.19 km/h)19.11 mph (30.75 km/h)
25 mph (40.23 km/h)23.88 mph (38.44 km/h)
30 mph (48.28 km/h)28.66 mph (46.13 km/h)
35 mph (56.33 km/h)33.44 mph (53.81 km/h)
40 mph (64.37 km/h)38.22 mph (61.5 km/h)
45 mph (72.42 km/h)42.99 mph (69.19 km/h)
50 mph (80.47 km/h)47.77 mph (76.88 km/h)
55 mph (88.51 km/h)52.55 mph (84.56 km/h)
60 mph (96.56 km/h)57.32 mph (92.25 km/h)
65 mph (104.61 km/h)62.1 mph (99.94 km/h)
70 mph (112.65 km/h)66.88 mph (107.63 km/h)
75 mph (120.7 km/h)71.65 mph (115.32 km/h)
80 mph (128.75 km/h)76.43 mph (123 km/h)
85 mph (136.79 km/h)81.21 mph (130.69 km/h)
90 mph (144.84 km/h)85.98 mph (138.38 km/h)
95 mph (152.89 km/h)90.76 mph (146.07 km/h)
100 mph (160.93 km/h)95.54 mph (153.75 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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