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
225/75r15 vs 235/75r15 Tire Comparison Side By Side
  225/75-15 235/75-15 Difference
Diameter inches (mm) 28.29 (718.5) 28.88 (733.5) 0.59 (15) 2.1%
Width inches (mm) 8.86 (225) 9.25 (235) 0.39 (10) 4.4%
Circum. inches (mm) 88.87 (2257.23) 90.72 (2304.36) 1.86 (47.12) 2.1%
Sidewall Height inches (mm) 6.64 (168.75) 6.94 (176.25) 0.3 (7.5) 4.4%
Revolutions per mile (km) 712.97 (443.02) 698.39 (433.96) -14.58 (-9.06) -2%

Speedometer Difference

Speedo Reading Actual Speed
20 mph (32.19 km/h)20.42 mph (32.86 km/h)
25 mph (40.23 km/h)25.52 mph (41.07 km/h)
30 mph (48.28 km/h)30.63 mph (49.29 km/h)
35 mph (56.33 km/h)35.73 mph (57.5 km/h)
40 mph (64.37 km/h)40.84 mph (65.72 km/h)
45 mph (72.42 km/h)45.94 mph (73.93 km/h)
50 mph (80.47 km/h)51.04 mph (82.15 km/h)
55 mph (88.51 km/h)56.15 mph (90.36 km/h)
60 mph (96.56 km/h)61.25 mph (98.58 km/h)
65 mph (104.61 km/h)66.36 mph (106.79 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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