Tire Size Calculator

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Stock Sizes

  • 255/75-16

Plus Sizes

  • 255/75-16

Accepts P-Metric and Inches
/ R
/ R
215/45r18 vs 225/45r18 Tire Comparison Side By Side
  215/45-18 225/45-18 Difference
Diameter inches (mm) 25.62 (650.7) 25.97 (659.7) 0.35 (9) 1.4%
Width inches (mm) 8.46 (215) 8.86 (225) 0.39 (10) 4.7%
Circum. inches (mm) 80.48 (2044.23) 81.59 (2072.51) 1.11 (28.27) 1.4%
Sidewall Height inches (mm) 3.81 (96.75) 3.99 (101.25) 0.18 (4.5) 4.7%
Revolutions per mile (km) 787.26 (489.18) 776.52 (482.51) -10.74 (-6.67) -1.4%

Speedometer Difference

Speedo Reading Actual Speed
20 mph (32.19 km/h)20.28 mph (32.63 km/h)
25 mph (40.23 km/h)25.35 mph (40.79 km/h)
30 mph (48.28 km/h)30.41 mph (48.95 km/h)
35 mph (56.33 km/h)35.48 mph (57.11 km/h)
40 mph (64.37 km/h)40.55 mph (65.26 km/h)
45 mph (72.42 km/h)45.62 mph (73.42 km/h)
50 mph (80.47 km/h)50.69 mph (81.58 km/h)
55 mph (88.51 km/h)55.76 mph (89.74 km/h)
60 mph (96.56 km/h)60.83 mph (97.9 km/h)
65 mph (104.61 km/h)65.9 mph (106.05 km/h)
70 mph (112.65 km/h)70.97 mph (114.21 km/h)
75 mph (120.7 km/h)76.04 mph (122.37 km/h)
80 mph (128.75 km/h)81.11 mph (130.53 km/h)
85 mph (136.79 km/h)86.18 mph (138.69 km/h)
90 mph (144.84 km/h)91.24 mph (146.84 km/h)
95 mph (152.89 km/h)96.31 mph (155 km/h)
100 mph (160.93 km/h)101.38 mph (163.16 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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