Tire Size Calculator

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Stock Sizes

  • 255/75-16

Plus Sizes

  • 255/75-16

Accepts P-Metric and Inches
/ R
/ R
315/75r16 vs 325/75r16 Tire Comparison Side By Side
  315/75-16 325/75-16 Difference
Diameter inches (mm) 34.6 (878.9) 35.19 (893.9) 0.59 (15) 1.7%
Width inches (mm) 12.4 (315) 12.8 (325) 0.39 (10) 3.2%
Circum. inches (mm) 108.71 (2761.15) 110.56 (2808.27) 1.86 (47.12) 1.7%
Sidewall Height inches (mm) 9.3 (236.25) 9.6 (243.75) 0.3 (7.5) 3.2%
Revolutions per mile (km) 582.85 (362.17) 573.07 (356.09) -9.78 (-6.08) -1.7%

Speedometer Difference

Speedo Reading Actual Speed
20 mph (32.19 km/h)20.34 mph (32.74 km/h)
25 mph (40.23 km/h)25.43 mph (40.92 km/h)
30 mph (48.28 km/h)30.51 mph (49.1 km/h)
35 mph (56.33 km/h)35.6 mph (57.29 km/h)
40 mph (64.37 km/h)40.68 mph (65.47 km/h)
45 mph (72.42 km/h)45.77 mph (73.66 km/h)
50 mph (80.47 km/h)50.85 mph (81.84 km/h)
55 mph (88.51 km/h)55.94 mph (90.02 km/h)
60 mph (96.56 km/h)61.02 mph (98.21 km/h)
65 mph (104.61 km/h)66.11 mph (106.39 km/h)
70 mph (112.65 km/h)71.19 mph (114.58 km/h)
75 mph (120.7 km/h)76.28 mph (122.76 km/h)
80 mph (128.75 km/h)81.37 mph (130.95 km/h)
85 mph (136.79 km/h)86.45 mph (139.13 km/h)
90 mph (144.84 km/h)91.54 mph (147.31 km/h)
95 mph (152.89 km/h)96.62 mph (155.5 km/h)
100 mph (160.93 km/h)101.71 mph (163.68 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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