Tire Size Calculator

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Stock Sizes

  • 255/75-16

Plus Sizes

  • 255/75-16

Accepts P-Metric and Inches
/ R
/ R
315/75r15 vs 315/75r16 Tire Comparison Side By Side
  315/75-15 315/75-16 Difference
Diameter inches (mm) 33.6 (853.5) 34.6 (878.9) 1 (25.4) 3%
Width inches (mm) 12.4 (315) 12.4 (315) 0 (0) 0%
Circum. inches (mm) 105.56 (2681.35) 108.71 (2761.15) 3.14 (79.8) 3%
Sidewall Height inches (mm) 9.3 (236.25) 9.3 (236.25) 0 (0) 0%
Revolutions per mile (km) 600.2 (372.95) 582.85 (362.17) -17.35 (-10.78) -2.9%

Speedometer Difference

Speedo Reading Actual Speed
20 mph (32.19 km/h)20.6 mph (33.14 km/h)
25 mph (40.23 km/h)25.74 mph (41.43 km/h)
30 mph (48.28 km/h)30.89 mph (49.72 km/h)
35 mph (56.33 km/h)36.04 mph (58 km/h)
40 mph (64.37 km/h)41.19 mph (66.29 km/h)
45 mph (72.42 km/h)46.34 mph (74.58 km/h)
50 mph (80.47 km/h)51.49 mph (82.86 km/h)
55 mph (88.51 km/h)56.64 mph (91.15 km/h)
60 mph (96.56 km/h)61.79 mph (99.43 km/h)
65 mph (104.61 km/h)66.93 mph (107.72 km/h)
70 mph (112.65 km/h)72.08 mph (116.01 km/h)
75 mph (120.7 km/h)77.23 mph (124.29 km/h)
80 mph (128.75 km/h)82.38 mph (132.58 km/h)
85 mph (136.79 km/h)87.53 mph (140.87 km/h)
90 mph (144.84 km/h)92.68 mph (149.15 km/h)
95 mph (152.89 km/h)97.83 mph (157.44 km/h)
100 mph (160.93 km/h)102.98 mph (165.72 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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