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 315/80r18 Tire Comparison Side By Side
  36/12.5-16.5 315/80-18 Difference
Diameter inches (mm) 36.03 (915.18) 37.84 (961.2) 1.81 (46.02) 5%
Width inches (mm) 12.52 (318) 12.4 (315) -0.12 (-3) -0.9%
Circum. inches (mm) 113.19 (2875.12) 118.89 (3019.7) 5.69 (144.58) 5%
Sidewall Height inches (mm) 9.77 (248.04) 9.92 (252) 0.16 (3.96) 1.6%
Revolutions per mile (km) 559.75 (347.81) 532.95 (331.16) -26.8 (-16.65) -4.8%

Speedometer Difference

Speedo Reading Actual Speed
20 mph (32.19 km/h)21.01 mph (33.81 km/h)
25 mph (40.23 km/h)26.26 mph (42.26 km/h)
30 mph (48.28 km/h)31.51 mph (50.71 km/h)
35 mph (56.33 km/h)36.76 mph (59.16 km/h)
40 mph (64.37 km/h)42.01 mph (67.61 km/h)
45 mph (72.42 km/h)47.26 mph (76.06 km/h)
50 mph (80.47 km/h)52.51 mph (84.51 km/h)
55 mph (88.51 km/h)57.77 mph (92.97 km/h)
60 mph (96.56 km/h)63.02 mph (101.42 km/h)
65 mph (104.61 km/h)68.27 mph (109.87 km/h)
70 mph (112.65 km/h)73.52 mph (118.32 km/h)
75 mph (120.7 km/h)78.77 mph (126.77 km/h)
80 mph (128.75 km/h)84.02 mph (135.22 km/h)
85 mph (136.79 km/h)89.27 mph (143.67 km/h)
90 mph (144.84 km/h)94.53 mph (152.12 km/h)
95 mph (152.89 km/h)99.78 mph (160.58 km/h)
100 mph (160.93 km/h)105.03 mph (169.03 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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