Tire Size Calculator

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Stock Sizes

  • 255/75-16

Plus Sizes

  • 255/75-16

Accepts P-Metric and Inches
/ R
/ R
235/50r18 vs 225/55r18 Tire Comparison Side By Side
  235/50-18 225/55-18 Difference
Diameter inches (mm) 27.25 (692.2) 27.74 (704.7) 0.49 (12.5) 1.8%
Width inches (mm) 9.25 (235) 8.86 (225) -0.39 (-10) -4.3%
Circum. inches (mm) 85.61 (2174.61) 87.16 (2213.88) 1.55 (39.27) 1.8%
Sidewall Height inches (mm) 4.63 (117.5) 4.87 (123.75) 0.25 (6.25) 5.3%
Revolutions per mile (km) 740.06 (459.85) 726.93 (451.69) -13.13 (-8.16) -1.8%

Speedometer Difference

Speedo Reading Actual Speed
20 mph (32.19 km/h)20.36 mph (32.77 km/h)
25 mph (40.23 km/h)25.45 mph (40.96 km/h)
30 mph (48.28 km/h)30.54 mph (49.15 km/h)
35 mph (56.33 km/h)35.63 mph (57.34 km/h)
40 mph (64.37 km/h)40.72 mph (65.54 km/h)
45 mph (72.42 km/h)45.81 mph (73.73 km/h)
50 mph (80.47 km/h)50.9 mph (81.92 km/h)
55 mph (88.51 km/h)55.99 mph (90.11 km/h)
60 mph (96.56 km/h)61.08 mph (98.3 km/h)
65 mph (104.61 km/h)66.17 mph (106.5 km/h)
70 mph (112.65 km/h)71.26 mph (114.69 km/h)
75 mph (120.7 km/h)76.35 mph (122.88 km/h)
80 mph (128.75 km/h)81.44 mph (131.07 km/h)
85 mph (136.79 km/h)86.53 mph (139.26 km/h)
90 mph (144.84 km/h)91.63 mph (147.46 km/h)
95 mph (152.89 km/h)96.72 mph (155.65 km/h)
100 mph (160.93 km/h)101.81 mph (163.84 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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