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
33/10.5r15 vs 31/10.5r15 Tire Comparison Side By Side
  33/10.5-15 31/10.5-15 Difference
Diameter inches (mm) 33.08 (840.24) 30.98 (786.84) -2.1 (-53.4) -6.4%
Width inches (mm) 10.51 (267) 10.51 (267) 0 (0) 0%
Circum. inches (mm) 103.92 (2639.69) 97.32 (2471.93) -6.6 (-167.76) -6.4%
Sidewall Height inches (mm) 9.04 (229.62) 7.99 (202.92) -1.05 (-26.7) -11.6%
Revolutions per mile (km) 609.67 (378.83) 651.05 (404.54) 41.38 (25.71) 6.8%

Speedometer Difference

Speedo Reading Actual Speed
20 mph (32.19 km/h)18.73 mph (30.14 km/h)
25 mph (40.23 km/h)23.41 mph (37.68 km/h)
30 mph (48.28 km/h)28.09 mph (45.21 km/h)
35 mph (56.33 km/h)32.78 mph (52.75 km/h)
40 mph (64.37 km/h)37.46 mph (60.28 km/h)
45 mph (72.42 km/h)42.14 mph (67.82 km/h)
50 mph (80.47 km/h)46.82 mph (75.35 km/h)
55 mph (88.51 km/h)51.5 mph (82.89 km/h)
60 mph (96.56 km/h)56.19 mph (90.42 km/h)
65 mph (104.61 km/h)60.87 mph (97.96 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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