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 285/75r16 Tire Comparison Side By Side
  280/85-16 285/75-16 Difference
Diameter inches (mm) 34.74 (882.4) 32.83 (833.9) -1.91 (-48.5) -5.5%
Width inches (mm) 11.02 (280) 11.22 (285) 0.2 (5) 1.8%
Circum. inches (mm) 109.14 (2772.14) 103.14 (2619.77) -6 (-152.37) -5.5%
Sidewall Height inches (mm) 9.37 (238) 8.42 (213.75) -0.95 (-24.25) -10.2%
Revolutions per mile (km) 580.54 (360.73) 614.31 (381.71) 33.76 (20.98) 5.8%

Speedometer Difference

Speedo Reading Actual Speed
20 mph (32.19 km/h)18.9 mph (30.42 km/h)
25 mph (40.23 km/h)23.63 mph (38.02 km/h)
30 mph (48.28 km/h)28.35 mph (45.63 km/h)
35 mph (56.33 km/h)33.08 mph (53.23 km/h)
40 mph (64.37 km/h)37.8 mph (60.84 km/h)
45 mph (72.42 km/h)42.53 mph (68.44 km/h)
50 mph (80.47 km/h)47.25 mph (76.04 km/h)
55 mph (88.51 km/h)51.98 mph (83.65 km/h)
60 mph (96.56 km/h)56.7 mph (91.25 km/h)
65 mph (104.61 km/h)61.43 mph (98.86 km/h)
70 mph (112.65 km/h)66.15 mph (106.46 km/h)
75 mph (120.7 km/h)70.88 mph (114.07 km/h)
80 mph (128.75 km/h)75.6 mph (121.67 km/h)
85 mph (136.79 km/h)80.33 mph (129.28 km/h)
90 mph (144.84 km/h)85.05 mph (136.88 km/h)
95 mph (152.89 km/h)89.78 mph (144.48 km/h)
100 mph (160.93 km/h)94.5 mph (152.09 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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