Tire Size Calculator

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Stock Sizes

  • 255/75-16

Plus Sizes

  • 255/75-16

Accepts P-Metric and Inches
/ R
/ R
315/55r22 vs 325/55r22 Tire Comparison Side By Side
  315/55-22 325/55-22 Difference
Diameter inches (mm) 35.64 (905.3) 36.07 (916.3) 0.43 (11) 1.2%
Width inches (mm) 12.4 (315) 12.8 (325) 0.39 (10) 3.2%
Circum. inches (mm) 111.97 (2844.08) 113.33 (2878.64) 1.36 (34.56) 1.2%
Sidewall Height inches (mm) 6.82 (173.25) 7.04 (178.75) 0.22 (5.5) 3.2%
Revolutions per mile (km) 565.86 (351.61) 559.06 (347.39) -6.79 (-4.22) -1.2%

Speedometer Difference

Speedo Reading Actual Speed
20 mph (32.19 km/h)20.24 mph (32.58 km/h)
25 mph (40.23 km/h)25.3 mph (40.72 km/h)
30 mph (48.28 km/h)30.36 mph (48.87 km/h)
35 mph (56.33 km/h)35.43 mph (57.01 km/h)
40 mph (64.37 km/h)40.49 mph (65.16 km/h)
45 mph (72.42 km/h)45.55 mph (73.3 km/h)
50 mph (80.47 km/h)50.61 mph (81.45 km/h)
55 mph (88.51 km/h)55.67 mph (89.59 km/h)
60 mph (96.56 km/h)60.73 mph (97.73 km/h)
65 mph (104.61 km/h)65.79 mph (105.88 km/h)
70 mph (112.65 km/h)70.85 mph (114.02 km/h)
75 mph (120.7 km/h)75.91 mph (122.17 km/h)
80 mph (128.75 km/h)80.97 mph (130.31 km/h)
85 mph (136.79 km/h)86.03 mph (138.46 km/h)
90 mph (144.84 km/h)91.09 mph (146.6 km/h)
95 mph (152.89 km/h)96.15 mph (154.75 km/h)
100 mph (160.93 km/h)101.22 mph (162.89 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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