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
205/75r15 vs 235/75r15 Tire Comparison Side By Side
  205/75-15 235/75-15 Difference
Diameter inches (mm) 27.11 (688.5) 28.88 (733.5) 1.77 (45) 6.5%
Width inches (mm) 8.07 (205) 9.25 (235) 1.18 (30) 14.6%
Circum. inches (mm) 85.16 (2162.99) 90.72 (2304.36) 5.57 (141.37) 6.5%
Sidewall Height inches (mm) 6.05 (153.75) 6.94 (176.25) 0.89 (22.5) 14.6%
Revolutions per mile (km) 744.04 (462.32) 698.39 (433.96) -45.65 (-28.36) -6.1%

Speedometer Difference

Speedo Reading Actual Speed
20 mph (32.19 km/h)21.31 mph (34.29 km/h)
25 mph (40.23 km/h)26.63 mph (42.86 km/h)
30 mph (48.28 km/h)31.96 mph (51.44 km/h)
35 mph (56.33 km/h)37.29 mph (60.01 km/h)
40 mph (64.37 km/h)42.61 mph (68.58 km/h)
45 mph (72.42 km/h)47.94 mph (77.15 km/h)
50 mph (80.47 km/h)53.27 mph (85.73 km/h)
55 mph (88.51 km/h)58.59 mph (94.3 km/h)
60 mph (96.56 km/h)63.92 mph (102.87 km/h)
65 mph (104.61 km/h)69.25 mph (111.44 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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