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
215/70r15 vs 235/75r15 Tire Comparison Side By Side
  215/70-15 235/75-15 Difference
Diameter inches (mm) 26.85 (682) 28.88 (733.5) 2.03 (51.5) 7.6%
Width inches (mm) 8.46 (215) 9.25 (235) 0.79 (20) 9.3%
Circum. inches (mm) 84.35 (2142.57) 90.72 (2304.36) 6.37 (161.79) 7.6%
Sidewall Height inches (mm) 5.93 (150.5) 6.94 (176.25) 1.01 (25.75) 17.1%
Revolutions per mile (km) 751.13 (466.73) 698.39 (433.96) -52.74 (-32.77) -7%

Speedometer Difference

Speedo Reading Actual Speed
20 mph (32.19 km/h)21.51 mph (34.62 km/h)
25 mph (40.23 km/h)26.89 mph (43.27 km/h)
30 mph (48.28 km/h)32.27 mph (51.93 km/h)
35 mph (56.33 km/h)37.64 mph (60.58 km/h)
40 mph (64.37 km/h)43.02 mph (69.23 km/h)
45 mph (72.42 km/h)48.4 mph (77.89 km/h)
50 mph (80.47 km/h)53.78 mph (86.54 km/h)
55 mph (88.51 km/h)59.15 mph (95.2 km/h)
60 mph (96.56 km/h)64.53 mph (103.85 km/h)
65 mph (104.61 km/h)69.91 mph (112.51 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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