Tire Size Calculator

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Stock Sizes

  • 255/75-16

Plus Sizes

  • 255/75-16

Accepts P-Metric and Inches
/ R
/ R
325/40r22 vs 33/12.5r22 Tire Comparison Side By Side
  325/40-22 33/12.5-22 Difference
Diameter inches (mm) 32.24 (818.8) 33.02 (838.64) 0.78 (19.84) 2.4%
Width inches (mm) 12.8 (325) 12.52 (318) -0.28 (-7) -2.2%
Circum. inches (mm) 101.27 (2572.34) 103.73 (2634.67) 2.45 (62.33) 2.4%
Sidewall Height inches (mm) 5.12 (130) 5.51 (139.92) 0.39 (9.92) 7.6%
Revolutions per mile (km) 625.64 (388.75) 610.83 (379.55) -14.8 (-9.2) -2.4%

Speedometer Difference

Speedo Reading Actual Speed
20 mph (32.19 km/h)20.48 mph (32.97 km/h)
25 mph (40.23 km/h)25.61 mph (41.21 km/h)
30 mph (48.28 km/h)30.73 mph (49.45 km/h)
35 mph (56.33 km/h)35.85 mph (57.69 km/h)
40 mph (64.37 km/h)40.97 mph (65.93 km/h)
45 mph (72.42 km/h)46.09 mph (74.18 km/h)
50 mph (80.47 km/h)51.21 mph (82.42 km/h)
55 mph (88.51 km/h)56.33 mph (90.66 km/h)
60 mph (96.56 km/h)61.45 mph (98.9 km/h)
65 mph (104.61 km/h)66.57 mph (107.14 km/h)
70 mph (112.65 km/h)71.7 mph (115.38 km/h)
75 mph (120.7 km/h)76.82 mph (123.63 km/h)
80 mph (128.75 km/h)81.94 mph (131.87 km/h)
85 mph (136.79 km/h)87.06 mph (140.11 km/h)
90 mph (144.84 km/h)92.18 mph (148.35 km/h)
95 mph (152.89 km/h)97.3 mph (156.59 km/h)
100 mph (160.93 km/h)102.42 mph (164.83 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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