Tire Size Calculator

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Stock Sizes

  • 255/75-16

Plus Sizes

  • 255/75-16

Accepts P-Metric and Inches
/ R
/ R
235/45r17 vs 225/50r17 Tire Comparison Side By Side
  235/45-17 225/50-17 Difference
Diameter inches (mm) 25.33 (643.3) 25.86 (656.8) 0.53 (13.5) 2.1%
Width inches (mm) 9.25 (235) 8.86 (225) -0.39 (-10) -4.3%
Circum. inches (mm) 79.57 (2020.99) 81.24 (2063.4) 1.67 (42.41) 2.1%
Sidewall Height inches (mm) 4.16 (105.75) 4.43 (112.5) 0.27 (6.75) 6.4%
Revolutions per mile (km) 796.32 (494.81) 779.95 (484.64) -16.37 (-10.17) -2.1%

Speedometer Difference

Speedo Reading Actual Speed
20 mph (32.19 km/h)20.42 mph (32.86 km/h)
25 mph (40.23 km/h)25.52 mph (41.08 km/h)
30 mph (48.28 km/h)30.63 mph (49.29 km/h)
35 mph (56.33 km/h)35.73 mph (57.51 km/h)
40 mph (64.37 km/h)40.84 mph (65.72 km/h)
45 mph (72.42 km/h)45.94 mph (73.94 km/h)
50 mph (80.47 km/h)51.05 mph (82.16 km/h)
55 mph (88.51 km/h)56.15 mph (90.37 km/h)
60 mph (96.56 km/h)61.26 mph (98.59 km/h)
65 mph (104.61 km/h)66.36 mph (106.8 km/h)
70 mph (112.65 km/h)71.47 mph (115.02 km/h)
75 mph (120.7 km/h)76.57 mph (123.23 km/h)
80 mph (128.75 km/h)81.68 mph (131.45 km/h)
85 mph (136.79 km/h)86.78 mph (139.67 km/h)
90 mph (144.84 km/h)91.89 mph (147.88 km/h)
95 mph (152.89 km/h)96.99 mph (156.1 km/h)
100 mph (160.93 km/h)102.1 mph (164.31 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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