Tire Size Calculator

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Stock Sizes

  • 255/75-16

Plus Sizes

  • 255/75-16

Accepts P-Metric and Inches
/ R
/ R
33/10.5r15 vs 315/75r16 Tire Comparison Side By Side
  33/10.5-15 315/75-16 Difference
Diameter inches (mm) 33.08 (840.24) 34.6 (878.9) 1.52 (38.66) 4.6%
Width inches (mm) 10.51 (267) 12.4 (315) 1.89 (48) 18%
Circum. inches (mm) 103.92 (2639.69) 108.71 (2761.15) 4.78 (121.45) 4.6%
Sidewall Height inches (mm) 9.04 (229.62) 9.3 (236.25) 0.26 (6.63) 2.9%
Revolutions per mile (km) 609.67 (378.83) 582.85 (362.17) -26.82 (-16.66) -4.4%

Speedometer Difference

Speedo Reading Actual Speed
20 mph (32.19 km/h)20.92 mph (33.67 km/h)
25 mph (40.23 km/h)26.15 mph (42.08 km/h)
30 mph (48.28 km/h)31.38 mph (50.5 km/h)
35 mph (56.33 km/h)36.61 mph (58.92 km/h)
40 mph (64.37 km/h)41.84 mph (67.34 km/h)
45 mph (72.42 km/h)47.07 mph (75.75 km/h)
50 mph (80.47 km/h)52.3 mph (84.17 km/h)
55 mph (88.51 km/h)57.53 mph (92.59 km/h)
60 mph (96.56 km/h)62.76 mph (101 km/h)
65 mph (104.61 km/h)67.99 mph (109.42 km/h)
70 mph (112.65 km/h)73.22 mph (117.84 km/h)
75 mph (120.7 km/h)78.45 mph (126.25 km/h)
80 mph (128.75 km/h)83.68 mph (134.67 km/h)
85 mph (136.79 km/h)88.91 mph (143.09 km/h)
90 mph (144.84 km/h)94.14 mph (151.51 km/h)
95 mph (152.89 km/h)99.37 mph (159.92 km/h)
100 mph (160.93 km/h)104.6 mph (168.34 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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