Tire Size Calculator

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Stock Sizes

  • 255/75-16

Plus Sizes

  • 255/75-16

Accepts P-Metric and Inches
/ R
/ R
225/55r18 vs 235/55r18 Tire Comparison Side By Side
  225/55-18 235/55-18 Difference
Diameter inches (mm) 27.74 (704.7) 28.18 (715.7) 0.43 (11) 1.6%
Width inches (mm) 8.86 (225) 9.25 (235) 0.39 (10) 4.4%
Circum. inches (mm) 87.16 (2213.88) 88.52 (2248.44) 1.36 (34.56) 1.6%
Sidewall Height inches (mm) 4.87 (123.75) 5.09 (129.25) 0.22 (5.5) 4.4%
Revolutions per mile (km) 726.93 (451.69) 715.76 (444.75) -11.17 (-6.94) -1.5%

Speedometer Difference

Speedo Reading Actual Speed
20 mph (32.19 km/h)20.31 mph (32.69 km/h)
25 mph (40.23 km/h)25.39 mph (40.86 km/h)
30 mph (48.28 km/h)30.47 mph (49.03 km/h)
35 mph (56.33 km/h)35.55 mph (57.21 km/h)
40 mph (64.37 km/h)40.62 mph (65.38 km/h)
45 mph (72.42 km/h)45.7 mph (73.55 km/h)
50 mph (80.47 km/h)50.78 mph (81.72 km/h)
55 mph (88.51 km/h)55.86 mph (89.9 km/h)
60 mph (96.56 km/h)60.94 mph (98.07 km/h)
65 mph (104.61 km/h)66.01 mph (106.24 km/h)
70 mph (112.65 km/h)71.09 mph (114.41 km/h)
75 mph (120.7 km/h)76.17 mph (122.59 km/h)
80 mph (128.75 km/h)81.25 mph (130.76 km/h)
85 mph (136.79 km/h)86.33 mph (138.93 km/h)
90 mph (144.84 km/h)91.4 mph (147.1 km/h)
95 mph (152.89 km/h)96.48 mph (155.27 km/h)
100 mph (160.93 km/h)101.56 mph (163.45 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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