Tire Size Calculator

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Stock Sizes

  • 255/75-16

Plus Sizes

  • 255/75-16

Accepts P-Metric and Inches
/ R
/ R
235/55r18 vs 225/55r18 Tire Comparison Side By Side
  235/55-18 225/55-18 Difference
Diameter inches (mm) 28.18 (715.7) 27.74 (704.7) -0.43 (-11) -1.5%
Width inches (mm) 9.25 (235) 8.86 (225) -0.39 (-10) -4.3%
Circum. inches (mm) 88.52 (2248.44) 87.16 (2213.88) -1.36 (-34.56) -1.5%
Sidewall Height inches (mm) 5.09 (129.25) 4.87 (123.75) -0.22 (-5.5) -4.3%
Revolutions per mile (km) 715.76 (444.75) 726.93 (451.69) 11.17 (6.94) 1.6%

Speedometer Difference

Speedo Reading Actual Speed
20 mph (32.19 km/h)19.69 mph (31.69 km/h)
25 mph (40.23 km/h)24.62 mph (39.62 km/h)
30 mph (48.28 km/h)29.54 mph (47.54 km/h)
35 mph (56.33 km/h)34.46 mph (55.46 km/h)
40 mph (64.37 km/h)39.39 mph (63.38 km/h)
45 mph (72.42 km/h)44.31 mph (71.31 km/h)
50 mph (80.47 km/h)49.23 mph (79.23 km/h)
55 mph (88.51 km/h)54.15 mph (87.15 km/h)
60 mph (96.56 km/h)59.08 mph (95.08 km/h)
65 mph (104.61 km/h)64 mph (103 km/h)
70 mph (112.65 km/h)68.92 mph (110.92 km/h)
75 mph (120.7 km/h)73.85 mph (118.85 km/h)
80 mph (128.75 km/h)78.77 mph (126.77 km/h)
85 mph (136.79 km/h)83.69 mph (134.69 km/h)
90 mph (144.84 km/h)88.62 mph (142.62 km/h)
95 mph (152.89 km/h)93.54 mph (150.54 km/h)
100 mph (160.93 km/h)98.46 mph (158.46 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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