Tire Size Calculator

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Stock Sizes

  • 255/75-16

Plus Sizes

  • 255/75-16

Accepts P-Metric and Inches
/ R
/ R
315/25r19 vs 315/85r15 Tire Comparison Side By Side
  315/25-19 315/85-15 Difference
Diameter inches (mm) 25.2 (640.1) 36.08 (916.5) 10.88 (276.4) 43.2%
Width inches (mm) 12.4 (315) 12.4 (315) 0 (0) 0%
Circum. inches (mm) 79.17 (2010.93) 113.36 (2879.27) 34.19 (868.34) 43.2%
Sidewall Height inches (mm) 3.1 (78.75) 10.54 (267.75) 7.44 (189) 240%
Revolutions per mile (km) 800.3 (497.28) 558.94 (347.31) -241.36 (-149.97) -30.2%

Speedometer Difference

Speedo Reading Actual Speed
20 mph (32.19 km/h)28.64 mph (46.09 km/h)
25 mph (40.23 km/h)35.8 mph (57.61 km/h)
30 mph (48.28 km/h)42.95 mph (69.13 km/h)
35 mph (56.33 km/h)50.11 mph (80.65 km/h)
40 mph (64.37 km/h)57.27 mph (92.17 km/h)
45 mph (72.42 km/h)64.43 mph (103.69 km/h)
50 mph (80.47 km/h)71.59 mph (115.21 km/h)
55 mph (88.51 km/h)78.75 mph (126.74 km/h)
60 mph (96.56 km/h)85.91 mph (138.26 km/h)
65 mph (104.61 km/h)93.07 mph (149.78 km/h)
70 mph (112.65 km/h)100.23 mph (161.3 km/h)
75 mph (120.7 km/h)107.39 mph (172.82 km/h)
80 mph (128.75 km/h)114.54 mph (184.34 km/h)
85 mph (136.79 km/h)121.7 mph (195.86 km/h)
90 mph (144.84 km/h)128.86 mph (207.38 km/h)
95 mph (152.89 km/h)136.02 mph (218.91 km/h)
100 mph (160.93 km/h)143.18 mph (230.43 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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