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Tire shape question – humped vs flat

Discussion in 'Lawn Mowing' started by Ronlawn, Jun 23, 2007.

  1. Ronlawn

    Ronlawn LawnSite Member
    Messages: 53

    I bought some cheaper walk behind front replacement tires(9x3.5x4 or so) from J Thomas for an old Ferris. But they are taller or more humped in the center, where as the old ones were flat clear out to the edge. I let the air out to 20 lbs but they still seem to have that humped in the center profile. The unit is heavy and I wanted a tire that bore the weight clear across its entire width. Will the tires flatten out with use or are some tires just structurally built to be more humped than others?
    Here are some tire pictures showing different amounts of hump in the middle:

    The Kendra tires on my other old walk behind are real flat across

    tire flatter profile composit 1.jpg
  2. Envy Lawn Service

    Envy Lawn Service LawnSite Fanatic
    Messages: 11,087

    Yes, some are made with a more round or more square profile.

    Kenda and another brand... they make a rather square profile.

    The others... they are more rounded.

    Drop the air pressure to 13-15 PSI and forget about it.
    The tire is flat across where it matters.

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