Ply Rating
It is just a strength index but in the past. Tires are given a ply rating, rather than specifying the
actual number of layers of fabric material used in the carcass.
wrapped to form the tire and give it strength. The angle of the plies in relation to the direction of rotation of the tire varies between 30°and 60°.
Bias or Radial Tire
Classification of Tires
Designating Method: A Type VIII or three-part nomenclature tire is identified
by 3 parameters: overall diameter, section width, and rim diameter. They are arranged in that order with the first two separated by an “X” and the second two separated by a “–.” For example: 18 X 4.25—10 designates a tire that is 18 inches in diameter with a 4.25-inch section width to be mounted on a 10- inch wheel rim.
In this manner, the plies have the bias of the fabric from which they are constructed facing the direction of rotation and across the tire.
Hence, they are called bias tires. The result is flexibility as the sidewall can flex with the fabric plies laid on the bias.
38×13 tire: The outside diameter is 38 inches, the section width is 13 inches.
Classification of Tires
Type Ⅷ tire Characteristic: Jet aircraft， high load-carrying ability,Ply rating: 4 to 38 Construction character: Low profile. Designating Method: Outside diameter, section width and rim diameter. 30×11.50-14.5 tire: The outside diameter is 30 inches, The section width is 11.50 inches, The rim diameter is 14.5 inches.
Designating Method: Section width and rim diameter 9.50-16 tire: the section width is 9.5 inches, the rim
diameter is 16 inches.
Classification of Tires
Tube tires: no inner liner, smoother inside surface. no “identification ” on the sidewall
Type Ⅶ tire Characteristic: Extra-high pressure,tion character:
Ply rating from 4 to 38.
Designating Method: Outside diameter and section width
《Aircraft System》 Aircraft Tires
Type
Classification of Tires
Size
Ply rating (层数）
Tube or tubeless
Classification of Tires
Type Ⅲ tire Characteristic: Low pressure, piston-power aircraft. Construction character: The section width is relatively wide in relation to the bead diameter.
Bias or Radial Tire
Another means of classifying an aircraft tire is by the direction of the plies used in construction of the tire, either bias or radial. Traditional aircraft tires are bias ply tires. The plies are
The ply rating of a tire relates to its maximum static load and its inflation pressure.
Tube or Tubeless Tires
Tubeless tires: one-tenth of an inch thick inner liner “TUBELESS”on the sidewall