#tread.contact  the part (as of a wheel or shoe) that makes contact with the ground
  supertype:  #contact.junction__tangency  a junction where things (as two electrical conductors) touch or are in physical contact; "they forget to solder the contacts"
  part of:  #tire__tyre  hoop that covers a wheel; "automobile tires are usually made of rubber and filled with compressed air"

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