Tire Size Calculator

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Stock Sizes

  • 255/75-16

Plus Sizes

  • 255/75-16

Accepts P-Metric and Inches
/ R
/ R
33/12.5r16.5 vs 265/75r16 Tire Comparison Side By Side
  33/12.5-16.5 265/75-16 Difference
Diameter inches (mm) 33.03 (838.86) 31.65 (803.9) -1.38 (-34.96) -4.2%
Width inches (mm) 12.52 (318) 10.43 (265) -2.09 (-53) -16.7%
Circum. inches (mm) 103.75 (2635.36) 99.43 (2525.53) -4.32 (-109.83) -4.2%
Sidewall Height inches (mm) 8.26 (209.88) 7.82 (198.75) -0.44 (-11.13) -5.3%
Revolutions per mile (km) 610.67 (379.45) 637.23 (395.96) 26.56 (16.5) 4.3%

Speedometer Difference

Speedo Reading Actual Speed
20 mph (32.19 km/h)19.17 mph (30.85 km/h)
25 mph (40.23 km/h)23.96 mph (38.56 km/h)
30 mph (48.28 km/h)28.75 mph (46.27 km/h)
35 mph (56.33 km/h)33.54 mph (53.98 km/h)
40 mph (64.37 km/h)38.33 mph (61.69 km/h)
45 mph (72.42 km/h)43.12 mph (69.4 km/h)
50 mph (80.47 km/h)47.92 mph (77.11 km/h)
55 mph (88.51 km/h)52.71 mph (84.83 km/h)
60 mph (96.56 km/h)57.5 mph (92.54 km/h)
65 mph (104.61 km/h)62.29 mph (100.25 km/h)
70 mph (112.65 km/h)67.08 mph (107.96 km/h)
75 mph (120.7 km/h)71.87 mph (115.67 km/h)
80 mph (128.75 km/h)76.67 mph (123.38 km/h)
85 mph (136.79 km/h)81.46 mph (131.09 km/h)
90 mph (144.84 km/h)86.25 mph (138.8 km/h)
95 mph (152.89 km/h)91.04 mph (146.52 km/h)
100 mph (160.93 km/h)95.83 mph (154.23 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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