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 325/50r22 Tire Comparison Side By Side
  315/55-22 325/50-22 Difference
Diameter inches (mm) 35.64 (905.3) 34.8 (883.8) -0.85 (-21.5) -2.4%
Width inches (mm) 12.4 (315) 12.8 (325) 0.39 (10) 3.2%
Circum. inches (mm) 111.97 (2844.08) 109.31 (2776.54) -2.66 (-67.54) -2.4%
Sidewall Height inches (mm) 6.82 (173.25) 6.4 (162.5) -0.42 (-10.75) -6.2%
Revolutions per mile (km) 565.86 (351.61) 579.62 (360.16) 13.77 (8.55) 2.4%

Speedometer Difference

Speedo Reading Actual Speed
20 mph (32.19 km/h)19.53 mph (31.42 km/h)
25 mph (40.23 km/h)24.41 mph (39.28 km/h)
30 mph (48.28 km/h)29.29 mph (47.13 km/h)
35 mph (56.33 km/h)34.17 mph (54.99 km/h)
40 mph (64.37 km/h)39.05 mph (62.85 km/h)
45 mph (72.42 km/h)43.93 mph (70.7 km/h)
50 mph (80.47 km/h)48.81 mph (78.56 km/h)
55 mph (88.51 km/h)53.69 mph (86.41 km/h)
60 mph (96.56 km/h)58.58 mph (94.27 km/h)
65 mph (104.61 km/h)63.46 mph (102.12 km/h)
70 mph (112.65 km/h)68.34 mph (109.98 km/h)
75 mph (120.7 km/h)73.22 mph (117.83 km/h)
80 mph (128.75 km/h)78.1 mph (125.69 km/h)
85 mph (136.79 km/h)82.98 mph (133.55 km/h)
90 mph (144.84 km/h)87.86 mph (141.4 km/h)
95 mph (152.89 km/h)92.74 mph (149.26 km/h)
100 mph (160.93 km/h)97.63 mph (157.11 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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