Tire Size Calculator

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Stock Sizes

  • 255/75-16

Plus Sizes

  • 255/75-16

Accepts P-Metric and Inches
/ R
/ R
285/75r16 vs 305/75r15 Tire Comparison Side By Side
  285/75-16 305/75-15 Difference
Diameter inches (mm) 32.83 (833.9) 33.01 (838.5) 0.18 (4.6) 0.6%
Width inches (mm) 11.22 (285) 12.01 (305) 0.79 (20) 7%
Circum. inches (mm) 103.14 (2619.77) 103.71 (2634.23) 0.57 (14.45) 0.6%
Sidewall Height inches (mm) 8.42 (213.75) 9.01 (228.75) 0.59 (15) 7%
Revolutions per mile (km) 614.31 (381.71) 610.94 (379.62) -3.37 (-2.09) -0.5%

Speedometer Difference

Speedo Reading Actual Speed
20 mph (32.19 km/h)20.11 mph (32.36 km/h)
25 mph (40.23 km/h)25.14 mph (40.46 km/h)
30 mph (48.28 km/h)30.17 mph (48.55 km/h)
35 mph (56.33 km/h)35.19 mph (56.64 km/h)
40 mph (64.37 km/h)40.22 mph (64.73 km/h)
45 mph (72.42 km/h)45.25 mph (72.82 km/h)
50 mph (80.47 km/h)50.28 mph (80.91 km/h)
55 mph (88.51 km/h)55.3 mph (89 km/h)
60 mph (96.56 km/h)60.33 mph (97.09 km/h)
65 mph (104.61 km/h)65.36 mph (105.18 km/h)
70 mph (112.65 km/h)70.39 mph (113.28 km/h)
75 mph (120.7 km/h)75.41 mph (121.37 km/h)
80 mph (128.75 km/h)80.44 mph (129.46 km/h)
85 mph (136.79 km/h)85.47 mph (137.55 km/h)
90 mph (144.84 km/h)90.5 mph (145.64 km/h)
95 mph (152.89 km/h)95.52 mph (153.73 km/h)
100 mph (160.93 km/h)100.55 mph (161.82 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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