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
31/10.5r15 vs 33/12.5r15 Tire Comparison Side By Side
  31/10.5-15 33/12.5-15 Difference
Diameter inches (mm) 30.98 (786.84) 33.03 (838.92) 2.05 (52.08) 6.6%
Width inches (mm) 10.51 (267) 12.52 (318) 2.01 (51) 19.1%
Circum. inches (mm) 97.32 (2471.93) 103.76 (2635.54) 6.44 (163.61) 6.6%
Sidewall Height inches (mm) 7.99 (202.92) 9.01 (228.96) 1.03 (26.04) 12.8%
Revolutions per mile (km) 651.05 (404.54) 610.63 (379.43) -40.42 (-25.11) -6.2%

Speedometer Difference

Speedo Reading Actual Speed
20 mph (32.19 km/h)21.32 mph (34.32 km/h)
25 mph (40.23 km/h)26.65 mph (42.9 km/h)
30 mph (48.28 km/h)31.99 mph (51.48 km/h)
35 mph (56.33 km/h)37.32 mph (60.06 km/h)
40 mph (64.37 km/h)42.65 mph (68.63 km/h)
45 mph (72.42 km/h)47.98 mph (77.21 km/h)
50 mph (80.47 km/h)53.31 mph (85.79 km/h)
55 mph (88.51 km/h)58.64 mph (94.37 km/h)
60 mph (96.56 km/h)63.97 mph (102.95 km/h)
65 mph (104.61 km/h)69.3 mph (111.53 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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