Tire Size Calculator

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Stock Sizes

  • 255/75-16

Plus Sizes

  • 255/75-16

Accepts P-Metric and Inches
/ R
/ R
225/35r19 vs 285/35r19 Tire Comparison Side By Side
  225/35-19 285/35-19 Difference
Diameter inches (mm) 25.2 (640.1) 26.85 (682.1) 1.65 (42) 6.6%
Width inches (mm) 8.86 (225) 11.22 (285) 2.36 (60) 26.7%
Circum. inches (mm) 79.17 (2010.93) 84.37 (2142.88) 5.19 (131.95) 6.6%
Sidewall Height inches (mm) 3.1 (78.75) 3.93 (99.75) 0.83 (21) 26.7%
Revolutions per mile (km) 800.3 (497.28) 751.02 (466.66) -49.28 (-30.62) -6.2%

Speedometer Difference

Speedo Reading Actual Speed
20 mph (32.19 km/h)21.31 mph (34.3 km/h)
25 mph (40.23 km/h)26.64 mph (42.87 km/h)
30 mph (48.28 km/h)31.97 mph (51.45 km/h)
35 mph (56.33 km/h)37.3 mph (60.02 km/h)
40 mph (64.37 km/h)42.62 mph (68.6 km/h)
45 mph (72.42 km/h)47.95 mph (77.17 km/h)
50 mph (80.47 km/h)53.28 mph (85.75 km/h)
55 mph (88.51 km/h)58.61 mph (94.32 km/h)
60 mph (96.56 km/h)63.94 mph (102.9 km/h)
65 mph (104.61 km/h)69.26 mph (111.47 km/h)
70 mph (112.65 km/h)74.59 mph (120.05 km/h)
75 mph (120.7 km/h)79.92 mph (128.62 km/h)
80 mph (128.75 km/h)85.25 mph (137.2 km/h)
85 mph (136.79 km/h)90.58 mph (145.77 km/h)
90 mph (144.84 km/h)95.91 mph (154.34 km/h)
95 mph (152.89 km/h)101.23 mph (162.92 km/h)
100 mph (160.93 km/h)106.56 mph (171.49 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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