Tire Size Calculator

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Stock Sizes

  • 255/75-16

Plus Sizes

  • 255/75-16

Accepts P-Metric and Inches
/ R
/ R
36/12.5r16.5 vs 285/65r17 Tire Comparison Side By Side
  36/12.5-16.5 285/65-17 Difference
Diameter inches (mm) 36.03 (915.18) 31.59 (802.3) -4.44 (-112.88) -12.3%
Width inches (mm) 12.52 (318) 11.22 (285) -1.3 (-33) -10.4%
Circum. inches (mm) 113.19 (2875.12) 99.23 (2520.5) -13.96 (-354.62) -12.3%
Sidewall Height inches (mm) 9.77 (248.04) 7.29 (185.25) -2.47 (-62.79) -25.3%
Revolutions per mile (km) 559.75 (347.81) 638.5 (396.75) 78.75 (48.94) 14.1%

Speedometer Difference

Speedo Reading Actual Speed
20 mph (32.19 km/h)17.53 mph (28.22 km/h)
25 mph (40.23 km/h)21.92 mph (35.27 km/h)
30 mph (48.28 km/h)26.3 mph (42.33 km/h)
35 mph (56.33 km/h)30.68 mph (49.38 km/h)
40 mph (64.37 km/h)35.07 mph (56.43 km/h)
45 mph (72.42 km/h)39.45 mph (63.49 km/h)
50 mph (80.47 km/h)43.83 mph (70.54 km/h)
55 mph (88.51 km/h)48.22 mph (77.6 km/h)
60 mph (96.56 km/h)52.6 mph (84.65 km/h)
65 mph (104.61 km/h)56.98 mph (91.71 km/h)
70 mph (112.65 km/h)61.37 mph (98.76 km/h)
75 mph (120.7 km/h)65.75 mph (105.81 km/h)
80 mph (128.75 km/h)70.13 mph (112.87 km/h)
85 mph (136.79 km/h)74.52 mph (119.92 km/h)
90 mph (144.84 km/h)78.9 mph (126.98 km/h)
95 mph (152.89 km/h)83.28 mph (134.03 km/h)
100 mph (160.93 km/h)87.67 mph (141.08 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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