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 Tire Floatation Facts
 
The following LIST compares the contact area on the ground (floatation) of different size radial tires.
  • 16.9-38 TIRE HAS 255 SQUARE INCH
  • 18.4-38 TIRE HAS 340 SQUARE INCH
  • 20.8-38 TIRE HAS 390 SQUARE INCH
  • 18.4-42 TIRE HAS 350 SQUARE INCH
  • 20.8-42 TIRE HAS 420 SQUARE INCH
  • 710/70-38 HAS 600 SQUARE INCH
  • 710/70-42 HAS 630 SQUARE INCH
    •  
    The 710/70R42 tires are 28 inches wide and are shown here on an John Deere 8420 tractor that left our shop recently.