Tire Size Calculator

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Stock Sizes

  • 255/75-16

Plus Sizes

  • 255/75-16

Accepts P-Metric and Inches
/ R
/ R
315/80r16 vs 205/100r16 Tire Comparison Side By Side
  315/80-16 205/100-16 Difference
Diameter inches (mm) 35.84 (910.4) 32.14 (816.4) -3.7 (-94) -10.3%
Width inches (mm) 12.4 (315) 8.07 (205) -4.33 (-110) -34.9%
Circum. inches (mm) 112.6 (2860.11) 100.98 (2564.8) -11.63 (-295.31) -10.3%
Sidewall Height inches (mm) 9.92 (252) 8.07 (205) -1.85 (-47) -18.7%
Revolutions per mile (km) 562.69 (349.64) 627.47 (389.89) 64.79 (40.26) 11.5%

Speedometer Difference

Speedo Reading Actual Speed
20 mph (32.19 km/h)17.93 mph (28.86 km/h)
25 mph (40.23 km/h)22.42 mph (36.08 km/h)
30 mph (48.28 km/h)26.9 mph (43.3 km/h)
35 mph (56.33 km/h)31.39 mph (50.51 km/h)
40 mph (64.37 km/h)35.87 mph (57.73 km/h)
45 mph (72.42 km/h)40.35 mph (64.94 km/h)
50 mph (80.47 km/h)44.84 mph (72.16 km/h)
55 mph (88.51 km/h)49.32 mph (79.37 km/h)
60 mph (96.56 km/h)53.8 mph (86.59 km/h)
65 mph (104.61 km/h)58.29 mph (93.81 km/h)
70 mph (112.65 km/h)62.77 mph (101.02 km/h)
75 mph (120.7 km/h)67.26 mph (108.24 km/h)
80 mph (128.75 km/h)71.74 mph (115.45 km/h)
85 mph (136.79 km/h)76.22 mph (122.67 km/h)
90 mph (144.84 km/h)80.71 mph (129.89 km/h)
95 mph (152.89 km/h)85.19 mph (137.1 km/h)
100 mph (160.93 km/h)89.67 mph (144.32 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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