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
245/75r16 vs 285/70r17 Tire Comparison Side By Side
  245/75-16 285/70-17 Difference
Diameter inches (mm) 30.47 (773.9) 32.71 (830.8) 2.24 (56.9) 7.4%
Width inches (mm) 9.65 (245) 11.22 (285) 1.57 (40) 16.3%
Circum. inches (mm) 95.72 (2431.28) 102.76 (2610.04) 7.04 (178.76) 7.4%
Sidewall Height inches (mm) 7.23 (183.75) 7.85 (199.5) 0.62 (15.75) 8.6%
Revolutions per mile (km) 661.93 (411.31) 616.6 (383.14) -45.33 (-28.17) -6.8%

Speedometer Difference

Speedo Reading Actual Speed
20 mph (32.19 km/h)21.47 mph (34.55 km/h)
25 mph (40.23 km/h)26.84 mph (43.19 km/h)
30 mph (48.28 km/h)32.21 mph (51.83 km/h)
35 mph (56.33 km/h)37.57 mph (60.47 km/h)
40 mph (64.37 km/h)42.94 mph (69.11 km/h)
45 mph (72.42 km/h)48.31 mph (77.75 km/h)
50 mph (80.47 km/h)53.68 mph (86.38 km/h)
55 mph (88.51 km/h)59.04 mph (95.02 km/h)
60 mph (96.56 km/h)64.41 mph (103.66 km/h)
65 mph (104.61 km/h)69.78 mph (112.3 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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