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
265/75r16 vs 315/75r16 Tire Comparison Side By Side
  265/75-16 315/75-16 Difference
Diameter inches (mm) 31.65 (803.9) 34.6 (878.9) 2.95 (75) 9.3%
Width inches (mm) 10.43 (265) 12.4 (315) 1.97 (50) 18.9%
Circum. inches (mm) 99.43 (2525.53) 108.71 (2761.15) 9.28 (235.62) 9.3%
Sidewall Height inches (mm) 7.82 (198.75) 9.3 (236.25) 1.48 (37.5) 18.9%
Revolutions per mile (km) 637.23 (395.96) 582.85 (362.17) -54.38 (-33.79) -8.5%

Speedometer Difference

Speedo Reading Actual Speed
20 mph (32.19 km/h)21.87 mph (35.19 km/h)
25 mph (40.23 km/h)27.33 mph (43.99 km/h)
30 mph (48.28 km/h)32.8 mph (52.78 km/h)
35 mph (56.33 km/h)38.27 mph (61.58 km/h)
40 mph (64.37 km/h)43.73 mph (70.38 km/h)
45 mph (72.42 km/h)49.2 mph (79.18 km/h)
50 mph (80.47 km/h)54.66 mph (87.97 km/h)
55 mph (88.51 km/h)60.13 mph (96.77 km/h)
60 mph (96.56 km/h)65.6 mph (105.57 km/h)
65 mph (104.61 km/h)71.06 mph (114.37 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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