Tire Size Calculator

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Stock Sizes

  • 255/75-16

Plus Sizes

  • 255/75-16

Accepts P-Metric and Inches
/ R
/ R
280/85r16 vs 33/8.25r16 Tire Comparison Side By Side
  280/85-16 33/8.25-16 Difference
Diameter inches (mm) 34.74 (882.4) 33.03 (839) -1.71 (-43.4) -4.9%
Width inches (mm) 11.02 (280) 8.27 (210) -2.76 (-70) -25%
Circum. inches (mm) 109.14 (2772.14) 103.77 (2635.8) -5.37 (-136.35) -4.9%
Sidewall Height inches (mm) 9.37 (238) 8.52 (216.3) -0.85 (-21.7) -9.1%
Revolutions per mile (km) 580.54 (360.73) 610.57 (379.39) 30.03 (18.66) 5.2%

Speedometer Difference

Speedo Reading Actual Speed
20 mph (32.19 km/h)19.02 mph (30.6 km/h)
25 mph (40.23 km/h)23.77 mph (38.25 km/h)
30 mph (48.28 km/h)28.52 mph (45.91 km/h)
35 mph (56.33 km/h)33.28 mph (53.56 km/h)
40 mph (64.37 km/h)38.03 mph (61.21 km/h)
45 mph (72.42 km/h)42.79 mph (68.86 km/h)
50 mph (80.47 km/h)47.54 mph (76.51 km/h)
55 mph (88.51 km/h)52.29 mph (84.16 km/h)
60 mph (96.56 km/h)57.05 mph (91.81 km/h)
65 mph (104.61 km/h)61.8 mph (99.46 km/h)
70 mph (112.65 km/h)66.56 mph (107.11 km/h)
75 mph (120.7 km/h)71.31 mph (114.76 km/h)
80 mph (128.75 km/h)76.07 mph (122.42 km/h)
85 mph (136.79 km/h)80.82 mph (130.07 km/h)
90 mph (144.84 km/h)85.57 mph (137.72 km/h)
95 mph (152.89 km/h)90.33 mph (145.37 km/h)
100 mph (160.93 km/h)95.08 mph (153.02 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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