Tire Size Calculator

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Stock Sizes

  • 255/75-16

Plus Sizes

  • 255/75-16

Accepts P-Metric and Inches
/ R
/ R
285/75r15 vs 265/75r15 Tire Comparison Side By Side
  285/75-15 265/75-15 Difference
Diameter inches (mm) 31.83 (808.5) 30.65 (778.5) -1.18 (-30) -3.7%
Width inches (mm) 11.22 (285) 10.43 (265) -0.79 (-20) -7%
Circum. inches (mm) 100 (2539.98) 96.29 (2445.73) -3.71 (-94.25) -3.7%
Sidewall Height inches (mm) 8.42 (213.75) 7.82 (198.75) -0.59 (-15) -7%
Revolutions per mile (km) 633.61 (393.7) 658.02 (408.88) 24.42 (15.17) 3.9%

Speedometer Difference

Speedo Reading Actual Speed
20 mph (32.19 km/h)19.26 mph (30.99 km/h)
25 mph (40.23 km/h)24.07 mph (38.74 km/h)
30 mph (48.28 km/h)28.89 mph (46.49 km/h)
35 mph (56.33 km/h)33.7 mph (54.24 km/h)
40 mph (64.37 km/h)38.52 mph (61.99 km/h)
45 mph (72.42 km/h)43.33 mph (69.73 km/h)
50 mph (80.47 km/h)48.14 mph (77.48 km/h)
55 mph (88.51 km/h)52.96 mph (85.23 km/h)
60 mph (96.56 km/h)57.77 mph (92.98 km/h)
65 mph (104.61 km/h)62.59 mph (100.73 km/h)
70 mph (112.65 km/h)67.4 mph (108.47 km/h)
75 mph (120.7 km/h)72.22 mph (116.22 km/h)
80 mph (128.75 km/h)77.03 mph (123.97 km/h)
85 mph (136.79 km/h)81.85 mph (131.72 km/h)
90 mph (144.84 km/h)86.66 mph (139.47 km/h)
95 mph (152.89 km/h)91.47 mph (147.21 km/h)
100 mph (160.93 km/h)96.29 mph (154.96 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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