Tire Size Calculator

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Stock Sizes

  • 255/75-16

Plus Sizes

  • 255/75-16

Accepts P-Metric and Inches
/ R
/ R
285/30r18 vs 225/35r19 Tire Comparison Side By Side
  285/30-18 225/35-19 Difference
Diameter inches (mm) 24.73 (628.2) 25.2 (640.1) 0.47 (11.9) 1.9%
Width inches (mm) 11.22 (285) 8.86 (225) -2.36 (-60) -21.1%
Circum. inches (mm) 77.7 (1973.55) 79.17 (2010.93) 1.47 (37.38) 1.9%
Sidewall Height inches (mm) 3.37 (85.5) 3.1 (78.75) -0.27 (-6.75) -7.9%
Revolutions per mile (km) 815.46 (506.7) 800.3 (497.28) -15.16 (-9.42) -1.9%

Speedometer Difference

Speedo Reading Actual Speed
20 mph (32.19 km/h)20.38 mph (32.8 km/h)
25 mph (40.23 km/h)25.47 mph (41 km/h)
30 mph (48.28 km/h)30.57 mph (49.19 km/h)
35 mph (56.33 km/h)35.66 mph (57.39 km/h)
40 mph (64.37 km/h)40.76 mph (65.59 km/h)
45 mph (72.42 km/h)45.85 mph (73.79 km/h)
50 mph (80.47 km/h)50.95 mph (81.99 km/h)
55 mph (88.51 km/h)56.04 mph (90.19 km/h)
60 mph (96.56 km/h)61.14 mph (98.39 km/h)
65 mph (104.61 km/h)66.23 mph (106.59 km/h)
70 mph (112.65 km/h)71.33 mph (114.79 km/h)
75 mph (120.7 km/h)76.42 mph (122.99 km/h)
80 mph (128.75 km/h)81.52 mph (131.19 km/h)
85 mph (136.79 km/h)86.61 mph (139.39 km/h)
90 mph (144.84 km/h)91.7 mph (147.58 km/h)
95 mph (152.89 km/h)96.8 mph (155.78 km/h)
100 mph (160.93 km/h)101.89 mph (163.98 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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