surface the outer boundary of an artifact or a material layer constituting or resembling such a boundary; "there is a special cleaner for these surfaces"; "the cloth had a pattern of red dots on a white surface"
pneumatic tire,
pneumatic tyre a tire made of reinforced rubber and filled with compressed air; used on motor vehicles and bicycles etc
tread -
structural member consisting of the horizontal part of a stair or step
structural member support that is a constituent part of any structure or building
tread -
the part (as of a wheel or shoe) that makes contact with the ground
locomote,
travel,
move,
go change location; move, travel, or proceed, also metaphorically; "How fast does your new car go?"; "We travelled from Rome to Naples by bus"; "The policemen went from door to door looking for the suspect"; "The soldiers moved towards the city in an attempt to take it before night fell"; "news travelled fast"
step on,
tread on place or press the foot on; "He stepped on the hem of her long gown"
The tread of a tire or track refers to the rubber on its circumference that makes contact with the road. As tires are used, the tread is worn off, limiting its effectiveness in providing traction. A worn tire tread can often be retreaded.
OmegaWiki Dictionary
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tread To step or walk (on or over something); to trample.