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 255/70r15 Tire Comparison Side By Side
  235/75-15 255/70-15 Difference
Diameter inches (mm) 28.88 (733.5) 29.06 (738) 0.18 (4.5) 0.6%
Width inches (mm) 9.25 (235) 10.04 (255) 0.79 (20) 8.5%
Circum. inches (mm) 90.72 (2304.36) 91.28 (2318.5) 0.56 (14.14) 0.6%
Sidewall Height inches (mm) 6.94 (176.25) 7.03 (178.5) 0.09 (2.25) 1.3%
Revolutions per mile (km) 698.39 (433.96) 694.13 (431.31) -4.26 (-2.65) -0.6%

Speedometer Difference

Speedo Reading Actual Speed
20 mph (32.19 km/h)20.12 mph (32.38 km/h)
25 mph (40.23 km/h)25.15 mph (40.48 km/h)
30 mph (48.28 km/h)30.18 mph (48.58 km/h)
35 mph (56.33 km/h)35.21 mph (56.67 km/h)
40 mph (64.37 km/h)40.25 mph (64.77 km/h)
45 mph (72.42 km/h)45.28 mph (72.86 km/h)
50 mph (80.47 km/h)50.31 mph (80.96 km/h)
55 mph (88.51 km/h)55.34 mph (89.06 km/h)
60 mph (96.56 km/h)60.37 mph (97.15 km/h)
65 mph (104.61 km/h)65.4 mph (105.25 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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