Tire Size Calculator

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Stock Sizes

  • 255/75-16

Plus Sizes

  • 255/75-16

Accepts P-Metric and Inches
/ R
/ R
285/50r15 vs 245/60r15 Tire Comparison Side By Side
  285/50-15 245/60-15 Difference
Diameter inches (mm) 26.22 (666) 26.57 (675) 0.35 (9) 1.4%
Width inches (mm) 11.22 (285) 9.65 (245) -1.57 (-40) -14%
Circum. inches (mm) 82.37 (2092.3) 83.49 (2120.58) 1.11 (28.27) 1.4%
Sidewall Height inches (mm) 5.61 (142.5) 5.79 (147) 0.18 (4.5) 3.2%
Revolutions per mile (km) 769.17 (477.94) 758.92 (471.57) -10.26 (-6.37) -1.3%

Speedometer Difference

Speedo Reading Actual Speed
20 mph (32.19 km/h)20.27 mph (32.62 km/h)
25 mph (40.23 km/h)25.34 mph (40.78 km/h)
30 mph (48.28 km/h)30.41 mph (48.93 km/h)
35 mph (56.33 km/h)35.47 mph (57.09 km/h)
40 mph (64.37 km/h)40.54 mph (65.24 km/h)
45 mph (72.42 km/h)45.61 mph (73.4 km/h)
50 mph (80.47 km/h)50.68 mph (81.55 km/h)
55 mph (88.51 km/h)55.74 mph (89.71 km/h)
60 mph (96.56 km/h)60.81 mph (97.87 km/h)
65 mph (104.61 km/h)65.88 mph (106.02 km/h)
70 mph (112.65 km/h)70.95 mph (114.18 km/h)
75 mph (120.7 km/h)76.01 mph (122.33 km/h)
80 mph (128.75 km/h)81.08 mph (130.49 km/h)
85 mph (136.79 km/h)86.15 mph (138.64 km/h)
90 mph (144.84 km/h)91.22 mph (146.8 km/h)
95 mph (152.89 km/h)96.28 mph (154.95 km/h)
100 mph (160.93 km/h)101.35 mph (163.11 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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