Tire Size Calculator

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Stock Sizes

  • 255/75-16

Plus Sizes

  • 255/75-16

Accepts P-Metric and Inches
/ R
/ R
255/80r16 vs 285/70r17 Tire Comparison Side By Side
  255/80-16 285/70-17 Difference
Diameter inches (mm) 32.06 (814.4) 32.71 (830.8) 0.65 (16.4) 2%
Width inches (mm) 10.04 (255) 11.22 (285) 1.18 (30) 11.8%
Circum. inches (mm) 100.73 (2558.51) 102.76 (2610.04) 2.03 (51.52) 2%
Sidewall Height inches (mm) 8.03 (204) 7.85 (199.5) -0.18 (-4.5) -2.2%
Revolutions per mile (km) 629.02 (390.85) 616.6 (383.14) -12.42 (-7.72) -2%

Speedometer Difference

Speedo Reading Actual Speed
20 mph (32.19 km/h)20.4 mph (32.84 km/h)
25 mph (40.23 km/h)25.5 mph (41.04 km/h)
30 mph (48.28 km/h)30.6 mph (49.25 km/h)
35 mph (56.33 km/h)35.7 mph (57.46 km/h)
40 mph (64.37 km/h)40.81 mph (65.67 km/h)
45 mph (72.42 km/h)45.91 mph (73.88 km/h)
50 mph (80.47 km/h)51.01 mph (82.09 km/h)
55 mph (88.51 km/h)56.11 mph (90.3 km/h)
60 mph (96.56 km/h)61.21 mph (98.51 km/h)
65 mph (104.61 km/h)66.31 mph (106.71 km/h)
70 mph (112.65 km/h)71.41 mph (114.92 km/h)
75 mph (120.7 km/h)76.51 mph (123.13 km/h)
80 mph (128.75 km/h)81.61 mph (131.34 km/h)
85 mph (136.79 km/h)86.71 mph (139.55 km/h)
90 mph (144.84 km/h)91.81 mph (147.76 km/h)
95 mph (152.89 km/h)96.91 mph (155.97 km/h)
100 mph (160.93 km/h)102.01 mph (164.18 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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