Hi Folks!
Just a lil more terms we should get acquinted with.
These are specific to tyres, wheels, etc.
Hope they help!
"bead" means that part of a tire, made of steel wires wrapped or reinforced by plies, that is shaped to fit the rim; (talon)
"bead separation" means a breakdown of bond between components in the bead;
"bias ply tire" means a tire in which the plies that extend to the beads are laid at alternate angles substantially less than 90 degrees to the centreline of the tread;
"carcass" means the structure of a tire without the tread and sidewall rubber;
"chunking" means the breaking away of pieces of the tread or sidewall of a tire;
"cord" means the strands forming the plies of a tire;
"cord separation" means the parting of cords from adjacent rubber compounds;
"cracking" means any parting within the tread, sidewall or innerliner of a tire extending to the cord;
"CT tire" means a tire that is designed to be mounted on a rim in such a manner that the flanges of the rim extend radially inward so as to be enclosed inside the air cavity of the tire;
"innerliner" means the layers that contain the inflating medium within a tire and form the inside surface of a tubeless tire;
"innerliner separation" means the parting of the innerliner from the cord;
"light truck tire" means a tire designed by its manufacturer for use on lightweight trucks or multipurpose passenger vehicles;
"load range" means a letter designation that indicates the maximum load rating of a tire;
"load rating" means the maximum load a tire is rated to carry at a given inflation pressure;
"maximum load rating" means the load rating at the maximum permissible inflation pressure for a tire;
"maximum permissible inflation pressure" means the maximum cold inflation pressure to which a tire may be inflated for normal highway use;
"open splice" means any parting at any junction of tread, sidewall or innerliner that extends to the cord;
"overall width" means the linear distance between the exteriors of the sidewalls of an inflated tire, including elevations due to labelling, decorations or protective bands;
"ply" means a layer of rubber-coated parallel cords;
"ply separation" means the parting of the rubber compound between adjacent plies of a tire;
"radial ply tire" means a tire in which the plies that extend to the beads are laid at substantially 90 degrees to the centreline of the tread;
"rim" means a support for a tire or a tire and tube assembly on which the beads are seated;
"section width" means the linear distance between the exteriors of the sidewalls of an inflated tire, excluding elevations due to labelling, decorations or protective bands;
"sidewall" means that portion of a tire between the tread and the bead;
"sidewall separation" means the parting of the rubber compound from the cord in the sidewall;
"size factor" means the aggregate 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, means any rim that is listed as appropriate for use with that tire in accordance with a tire and rim document where the document includes the dimensional specifications of the rim and a diagram of the rim;
"tread" means that portion of a tire that comes into contact with the road;
"tread rib" means a tread section running circumferentially around a tire;
"tread separation" means the parting of the tread from the carcass; (séparation de la bande de roulement)
"truck" has the same meaning as in subsection 2(1) of the Motor Vehicle Safety Regulations. (camion)
Taken from: Motor Vehicle Tire Safety Regulations, 1995
http://www.tc.gc.ca/acts-regulations/general/m/mvsa/regulations/mvts/001/mvtsr1-3.html