Tire Size Calculator

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Stock Sizes

  • 255/75-16

Plus Sizes

  • 255/75-16

Accepts P-Metric and Inches
/ R
/ R
33/12.5r15 vs 315/70r17 Tire Comparison Side By Side
  33/12.5-15 315/70-17 Difference
Diameter inches (mm) 33.03 (838.92) 34.36 (872.8) 1.33 (33.88) 4%
Width inches (mm) 12.52 (318) 12.4 (315) -0.12 (-3) -0.9%
Circum. inches (mm) 103.76 (2635.54) 107.95 (2741.98) 4.19 (106.44) 4%
Sidewall Height inches (mm) 9.01 (228.96) 8.68 (220.5) -0.33 (-8.46) -3.7%
Revolutions per mile (km) 610.63 (379.43) 586.93 (364.7) -23.7 (-14.73) -3.9%

Speedometer Difference

Speedo Reading Actual Speed
20 mph (32.19 km/h)20.81 mph (33.49 km/h)
25 mph (40.23 km/h)26.01 mph (41.86 km/h)
30 mph (48.28 km/h)31.21 mph (50.23 km/h)
35 mph (56.33 km/h)36.41 mph (58.6 km/h)
40 mph (64.37 km/h)41.62 mph (66.97 km/h)
45 mph (72.42 km/h)46.82 mph (75.35 km/h)
50 mph (80.47 km/h)52.02 mph (83.72 km/h)
55 mph (88.51 km/h)57.22 mph (92.09 km/h)
60 mph (96.56 km/h)62.42 mph (100.46 km/h)
65 mph (104.61 km/h)67.63 mph (108.83 km/h)
70 mph (112.65 km/h)72.83 mph (117.2 km/h)
75 mph (120.7 km/h)78.03 mph (125.58 km/h)
80 mph (128.75 km/h)83.23 mph (133.95 km/h)
85 mph (136.79 km/h)88.43 mph (142.32 km/h)
90 mph (144.84 km/h)93.63 mph (150.69 km/h)
95 mph (152.89 km/h)98.84 mph (159.06 km/h)
100 mph (160.93 km/h)104.04 mph (167.43 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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