Tire Size Calculator

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Stock Sizes

  • 255/75-16

Plus Sizes

  • 255/75-16

Accepts P-Metric and Inches
/ R
/ R
280/80r16 vs 34/10.5r16 Tire Comparison Side By Side
  280/80-16 34/10.5-16 Difference
Diameter inches (mm) 33.64 (854.4) 34.08 (865.64) 0.44 (11.24) 1.3%
Width inches (mm) 11.02 (280) 10.51 (267) -0.51 (-13) -4.6%
Circum. inches (mm) 105.68 (2684.18) 107.07 (2719.49) 1.39 (35.31) 1.3%
Sidewall Height inches (mm) 8.82 (224) 9.04 (229.62) 0.22 (5.62) 2.5%
Revolutions per mile (km) 599.57 (372.55) 591.78 (367.72) -7.79 (-4.84) -1.3%

Speedometer Difference

Speedo Reading Actual Speed
20 mph (32.19 km/h)20.26 mph (32.61 km/h)
25 mph (40.23 km/h)25.33 mph (40.76 km/h)
30 mph (48.28 km/h)30.39 mph (48.92 km/h)
35 mph (56.33 km/h)35.46 mph (57.07 km/h)
40 mph (64.37 km/h)40.53 mph (65.22 km/h)
45 mph (72.42 km/h)45.59 mph (73.37 km/h)
50 mph (80.47 km/h)50.66 mph (81.53 km/h)
55 mph (88.51 km/h)55.72 mph (89.68 km/h)
60 mph (96.56 km/h)60.79 mph (97.83 km/h)
65 mph (104.61 km/h)65.86 mph (105.98 km/h)
70 mph (112.65 km/h)70.92 mph (114.14 km/h)
75 mph (120.7 km/h)75.99 mph (122.29 km/h)
80 mph (128.75 km/h)81.05 mph (130.44 km/h)
85 mph (136.79 km/h)86.12 mph (138.59 km/h)
90 mph (144.84 km/h)91.18 mph (146.75 km/h)
95 mph (152.89 km/h)96.25 mph (154.9 km/h)
100 mph (160.93 km/h)101.32 mph (163.05 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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