Tire Size Calculator

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Stock Sizes

  • 255/75-16

Plus Sizes

  • 255/75-16

Accepts P-Metric and Inches
/ R
/ R
285/65r16 vs 315/75r16 Tire Comparison Side By Side
  285/65-16 315/75-16 Difference
Diameter inches (mm) 30.59 (776.9) 34.6 (878.9) 4.02 (102) 13.1%
Width inches (mm) 11.22 (285) 12.4 (315) 1.18 (30) 10.5%
Circum. inches (mm) 96.09 (2440.7) 108.71 (2761.15) 12.62 (320.44) 13.1%
Sidewall Height inches (mm) 7.29 (185.25) 9.3 (236.25) 2.01 (51) 27.5%
Revolutions per mile (km) 659.38 (409.72) 582.85 (362.17) -76.52 (-47.55) -11.6%

Speedometer Difference

Speedo Reading Actual Speed
20 mph (32.19 km/h)22.63 mph (36.41 km/h)
25 mph (40.23 km/h)28.28 mph (45.52 km/h)
30 mph (48.28 km/h)33.94 mph (54.62 km/h)
35 mph (56.33 km/h)39.6 mph (63.72 km/h)
40 mph (64.37 km/h)45.25 mph (72.83 km/h)
45 mph (72.42 km/h)50.91 mph (81.93 km/h)
50 mph (80.47 km/h)56.56 mph (91.03 km/h)
55 mph (88.51 km/h)62.22 mph (100.14 km/h)
60 mph (96.56 km/h)67.88 mph (109.24 km/h)
65 mph (104.61 km/h)73.53 mph (118.34 km/h)
70 mph (112.65 km/h)79.19 mph (127.44 km/h)
75 mph (120.7 km/h)84.85 mph (136.55 km/h)
80 mph (128.75 km/h)90.5 mph (145.65 km/h)
85 mph (136.79 km/h)96.16 mph (154.75 km/h)
90 mph (144.84 km/h)101.82 mph (163.86 km/h)
95 mph (152.89 km/h)107.47 mph (172.96 km/h)
100 mph (160.93 km/h)113.13 mph (182.06 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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