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 265/35r18 Tire Comparison Side By Side
  285/30-18 265/35-18 Difference
Diameter inches (mm) 24.73 (628.2) 25.3 (642.7) 0.57 (14.5) 2.3%
Width inches (mm) 11.22 (285) 10.43 (265) -0.79 (-20) -7%
Circum. inches (mm) 77.7 (1973.55) 79.49 (2019.1) 1.79 (45.55) 2.3%
Sidewall Height inches (mm) 3.37 (85.5) 3.65 (92.75) 0.29 (7.25) 8.5%
Revolutions per mile (km) 815.46 (506.7) 797.06 (495.27) -18.4 (-11.43) -2.3%

Speedometer Difference

Speedo Reading Actual Speed
20 mph (32.19 km/h)20.46 mph (32.93 km/h)
25 mph (40.23 km/h)25.58 mph (41.16 km/h)
30 mph (48.28 km/h)30.69 mph (49.39 km/h)
35 mph (56.33 km/h)35.81 mph (57.63 km/h)
40 mph (64.37 km/h)40.92 mph (65.86 km/h)
45 mph (72.42 km/h)46.04 mph (74.09 km/h)
50 mph (80.47 km/h)51.15 mph (82.32 km/h)
55 mph (88.51 km/h)56.27 mph (90.56 km/h)
60 mph (96.56 km/h)61.38 mph (98.79 km/h)
65 mph (104.61 km/h)66.5 mph (107.02 km/h)
70 mph (112.65 km/h)71.62 mph (115.25 km/h)
75 mph (120.7 km/h)76.73 mph (123.49 km/h)
80 mph (128.75 km/h)81.85 mph (131.72 km/h)
85 mph (136.79 km/h)86.96 mph (139.95 km/h)
90 mph (144.84 km/h)92.08 mph (148.18 km/h)
95 mph (152.89 km/h)97.19 mph (156.42 km/h)
100 mph (160.93 km/h)102.31 mph (164.65 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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