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 225/60r18 Tire Comparison Side By Side
  235/50-18 225/60-18 Difference
Diameter inches (mm) 27.25 (692.2) 28.63 (727.2) 1.38 (35) 5.1%
Width inches (mm) 9.25 (235) 8.86 (225) -0.39 (-10) -4.3%
Circum. inches (mm) 85.61 (2174.61) 89.94 (2284.57) 4.33 (109.96) 5.1%
Sidewall Height inches (mm) 4.63 (117.5) 5.31 (135) 0.69 (17.5) 14.9%
Revolutions per mile (km) 740.06 (459.85) 704.44 (437.72) -35.62 (-22.13) -4.8%

Speedometer Difference

Speedo Reading Actual Speed
20 mph (32.19 km/h)21.01 mph (33.81 km/h)
25 mph (40.23 km/h)26.26 mph (42.27 km/h)
30 mph (48.28 km/h)31.52 mph (50.72 km/h)
35 mph (56.33 km/h)36.77 mph (59.18 km/h)
40 mph (64.37 km/h)42.02 mph (67.63 km/h)
45 mph (72.42 km/h)47.28 mph (76.08 km/h)
50 mph (80.47 km/h)52.53 mph (84.54 km/h)
55 mph (88.51 km/h)57.78 mph (92.99 km/h)
60 mph (96.56 km/h)63.03 mph (101.44 km/h)
65 mph (104.61 km/h)68.29 mph (109.9 km/h)
70 mph (112.65 km/h)73.54 mph (118.35 km/h)
75 mph (120.7 km/h)78.79 mph (126.8 km/h)
80 mph (128.75 km/h)84.05 mph (135.26 km/h)
85 mph (136.79 km/h)89.3 mph (143.71 km/h)
90 mph (144.84 km/h)94.55 mph (152.16 km/h)
95 mph (152.89 km/h)99.8 mph (160.62 km/h)
100 mph (160.93 km/h)105.06 mph (169.07 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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