Mike "Wuzzy121". Rest in peace, brother

Tire Size Calculator

Tire Size Finder (optional):

Stock Sizes

  • 255/75-16

Plus Sizes

  • 255/75-16

Accepts P-Metric and Inches
/ R
/ R
285/75r16 vs 315/75r16 Tire Comparison Side By Side
  285/75-16 315/75-16 Difference
Diameter inches (mm) 32.83 (833.9) 34.6 (878.9) 1.77 (45) 5.4%
Width inches (mm) 11.22 (285) 12.4 (315) 1.18 (30) 10.5%
Circum. inches (mm) 103.14 (2619.77) 108.71 (2761.15) 5.57 (141.37) 5.4%
Sidewall Height inches (mm) 8.42 (213.75) 9.3 (236.25) 0.89 (22.5) 10.5%
Revolutions per mile (km) 614.31 (381.71) 582.85 (362.17) -31.45 (-19.54) -5.1%

Speedometer Difference

Speedo Reading Actual Speed
20 mph (32.19 km/h)21.08 mph (33.92 km/h)
25 mph (40.23 km/h)26.35 mph (42.4 km/h)
30 mph (48.28 km/h)31.62 mph (50.89 km/h)
35 mph (56.33 km/h)36.89 mph (59.37 km/h)
40 mph (64.37 km/h)42.16 mph (67.85 km/h)
45 mph (72.42 km/h)47.43 mph (76.33 km/h)
50 mph (80.47 km/h)52.7 mph (84.81 km/h)
55 mph (88.51 km/h)57.97 mph (93.29 km/h)
60 mph (96.56 km/h)63.24 mph (101.77 km/h)
65 mph (104.61 km/h)68.51 mph (110.25 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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