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
235/75r15 vs 31/10.5r15 Tire Comparison Side By Side
  235/75-15 31/10.5-15 Difference
Diameter inches (mm) 28.88 (733.5) 30.98 (786.84) 2.1 (53.34) 7.3%
Width inches (mm) 9.25 (235) 10.51 (267) 1.26 (32) 13.6%
Circum. inches (mm) 90.72 (2304.36) 97.32 (2471.93) 6.6 (167.57) 7.3%
Sidewall Height inches (mm) 6.94 (176.25) 7.99 (202.92) 1.05 (26.67) 15.1%
Revolutions per mile (km) 698.39 (433.96) 651.05 (404.54) -47.34 (-29.42) -6.8%

Speedometer Difference

Speedo Reading Actual Speed
20 mph (32.19 km/h)21.45 mph (34.53 km/h)
25 mph (40.23 km/h)26.82 mph (43.16 km/h)
30 mph (48.28 km/h)32.18 mph (51.79 km/h)
35 mph (56.33 km/h)37.55 mph (60.42 km/h)
40 mph (64.37 km/h)42.91 mph (69.06 km/h)
45 mph (72.42 km/h)48.27 mph (77.69 km/h)
50 mph (80.47 km/h)53.64 mph (86.32 km/h)
55 mph (88.51 km/h)59 mph (94.95 km/h)
60 mph (96.56 km/h)64.36 mph (103.58 km/h)
65 mph (104.61 km/h)69.73 mph (112.21 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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