Pennsylvania Code › Title 67 - TRANSPORTATION › Part I - Department of Transportation › Subpart A - Vehicle Code Provisions › Article VII - Vehicle Characteristics › Chapter 159 - NEW PNEUMATIC TIRES › Section 159.3 - Definitions

Current through Register Vol. 54, No. 28, July 13, 2024
The following words and terms, when used in this chapter,
						have the following meanings, unless the context clearly indicates
						otherwise:
Bead
-That part of the tire made of steel
						wires, wrapped or reinforced by ply cords, that is shaped to fit the
						rim.
Bead separation
-A breakdown of bond
						between components in the bead area.
Bias ply tire
-A pneumatic tire in which
						the ply cords that extend to the beads are laid at alternate angles
						substantially less than 90° to the centerline of the tread.
Carcass
-The tire structure, except tread
						and sidewall rubber.
Chunking
-The breaking away of pieces of
						the tread or sidewall.
Cord
-The strands forming the plies in
						the tire.
Cord separation
-Cords parting away from
						adjacent rubber compounds.
Cracking
-Any parting within the tread,
						sidewall or innerliner of the tire extending to cord material.
Groove
-The space between two adjacent
						tread ribs.
Innerliner
-The layers forming the inside
						surface of a tubeless tire that contains the inflating medium within the
						tire.
Innerliner separation
-The parting of the
						innerliner from cord material in the carcass.
Load rating
-The maximum load a tire is
						rated to carry for a given inflation pressure.
Maximum load rating
-The load rating at
						the maximum permissible inflation pressure for that tire.
Maximum permissible inflation
						pressure
-The maximum cold inflation pressure to which a tire may be
						inflated.
Open splice
-Any parting at any junction
						of tread, sidewall or innerliner that extends to cord material.
Overall width
-The linear distance
						between the exteriors of the sidewalls of an inflated tire, including
						elevations due to labeling, decorations or protective bands or ribs.
Ply
-A layer of rubber-coated parallel
						cords.
Ply separation
-A parting of rubber
						compound between adjacent plies.
Pneumatic tire
-A mechanical device made
						of rubber, chemicals, fabric and steel or other materials, which, when mounted
						on an automotive wheel, provides the traction and contains the gas or fluid
						that sustains the load.
Radial ply tire
-A pneumatic tire in
						which the ply cords which extend to the beads are laid at substantially 90°
						to the centerline of the tread.
Rim
-A metal support for a tire or a tire
						and tube assembly upon which the tire beads are seated.
Section width
-The linear distance
						between the exteriors of the sidewalls of an inflated tire, excluding
						elevations due to labeling, decoration, or protective bands.
Sidewall
-That portion of a tire between
						the tread and the bead.
Sidewall separation
-The parting of the
						rubber compound from the cord material in the sidewall.
Size factor
-The sum of the section width
						and the outer diameter of a tire determined on the test rim.
Test rim
-With reference to a tire to be
						tested, any rim that is listed as appropriate for use with that tire in
						accordance with §
											159.4(d)
						(relating to requirements). For purposes of this chapter and section
						571.110, each rim listing shall
						include dimensional specifications and a diagram of the rim.
Tread
-That portion of a tire that comes
						into contact with the road.
Tread rib
-A tread section running
						circumferentially around a tire.
Tread separation
-Pulling away of the
						tread from the tire carcass.
This section cited in 67 Pa. Code §
													159.4 (relating to
						  requirements).