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 35/12.5r22 Tire Comparison Side By Side
  325/40-22 35/12.5-22 Difference
Diameter inches (mm) 32.24 (818.8) 35.02 (889.52) 2.78 (70.72) 8.6%
Width inches (mm) 12.8 (325) 12.52 (318) -0.28 (-7) -2.2%
Circum. inches (mm) 101.27 (2572.34) 110.02 (2794.51) 8.75 (222.17) 8.6%
Sidewall Height inches (mm) 5.12 (130) 6.51 (165.36) 1.39 (35.36) 27.2%
Revolutions per mile (km) 625.64 (388.75) 575.89 (357.84) -49.74 (-30.91) -8%

Speedometer Difference

Speedo Reading Actual Speed
20 mph (32.19 km/h)21.73 mph (34.97 km/h)
25 mph (40.23 km/h)27.16 mph (43.71 km/h)
30 mph (48.28 km/h)32.59 mph (52.45 km/h)
35 mph (56.33 km/h)38.02 mph (61.19 km/h)
40 mph (64.37 km/h)43.45 mph (69.93 km/h)
45 mph (72.42 km/h)48.89 mph (78.68 km/h)
50 mph (80.47 km/h)54.32 mph (87.42 km/h)
55 mph (88.51 km/h)59.75 mph (96.16 km/h)
60 mph (96.56 km/h)65.18 mph (104.9 km/h)
65 mph (104.61 km/h)70.61 mph (113.64 km/h)
70 mph (112.65 km/h)76.05 mph (122.38 km/h)
75 mph (120.7 km/h)81.48 mph (131.13 km/h)
80 mph (128.75 km/h)86.91 mph (139.87 km/h)
85 mph (136.79 km/h)92.34 mph (148.61 km/h)
90 mph (144.84 km/h)97.77 mph (157.35 km/h)
95 mph (152.89 km/h)103.21 mph (166.09 km/h)
100 mph (160.93 km/h)108.64 mph (174.83 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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