It's Really Easy if Everyone is on the Same Page
One of the great and totally unnecessary sources of misunderstanding between casings supplies and retreaders is a simple definition of terms.
The buyer will order an A grade casing.
The seller will have one specification in mind, while the seller will have something quite different in mind. So when the container arrives, the problems begin.
In order to avoid any such misunderstandings, we put our specifications in writing. This saves a lot of trouble in the long run and helps us make friends for many years to come.
Radial Casings from Japan - Specification Sheet
Virgin casing that has not been retreaded previously
No cuts or breaks
No repairs or impact breaks
No exposed steel
No existing repairs
Sidewalls are in good condition
No weather cracking
No distortion of tubeless bead surfaces
Same as Grade A with exceptions of :
Minor cuts and chips with some exposed steel in the tread area
Maximum of two nail holes in tread area only. Must be 1 1/2 inches in from the tread edge with maximum diameter of 3/8 inch.
Previously treaded once in full, in top tread, or in bead to bead.
Maximum two nail holes in tread area only. Must be 1 1/2 inches in from tread
All other conditions are same as Grade A
Full Range of passenger, light truck, truck and aircraft sizes available.
It takes about 22 gallons of oil to produce one truck tire and just 7 gallons to retread the same tire. This means 15 gallons of oil are saved each time a truck tire is recycled. Retreading conserves 400 million gallons of oil annually in the United States and Canada.
Retreaded tires contain 75 percent post consumer recycled materials, one of the highest percentages of all recycled products. Since the casing already has undergone one life cycle, the only new material used to retread a tire is the raw material used to manufacture the tread. In 1992, 33 million tires were retreaded in North America and placed back in service rather than further contributing to the solid waste stream.
*Source: The Retreading/Repair Journal, E.J. Wagner
A casing is an element that allows the tire to guarantee its principal task, i.e., to support the load. When the tire is inflated, the air is injected at a pressure in relation to the volume of the tire, which makes it possible to support the load weighing on the tire. The purpose of the casing is to contain air under pressure and consequently the load.
In addition, it ensures, vertically, the function of the suspensions. When you're behind a truck, observe how the tires work: it is the casing that absorbs and filters most of the irregularities of the roadbed, even when the vehicle goes up onto a sidewalk!
Laterally, the casing resists drifting, resists the centrifugal force around curves and resists important deformations notable at low speeds: for proof, just look at tires of a semi-trailer on the highway or while it maneuvers around a city square.
Finally, it's the casing that transmits the vehicle's torque stresses to the tread, which is in contact with the ground, resisting considerable longitudinal stresses to transmit the motive torque and the braking torque, which tend to separate the cables that compose it.
A composite material:
In the case of Michelin, about 30 different materials such as steel and different qualities of rubber have to be made to co-exist. Steel is also found in the bead wires: those two elements that allow the tire to be locked onto the rim around which the ply of the casing is fixed. In larger tires the bead wires have a rectangular section that permits the perfect positioning of the bead into the housing of the rim. This design has been patented by Michelin to ensure a much longer life than that of the bead wires with a round section normally used.
Steel cables composed of 12-27 wires "coated" in rubber form the different plies making up the casing. The radial ply and the plies of the crown, arranged with different angles, form an undeformable triangular structure.
Last, the elastic cables of the protective ply situated underneath the tread improve the resistance to cuts and perforation.
Different rubber compounds:
On the crown, sidewall or in the bead, the compounds of rubber used have specific roles and require elasticity, rigidity, grip, and resistance to high temperatures. Inside the tire, air-proof rubber, 100% butyl, guarantees the best pressure seal.
source credit : www.retread.org
Also know as Second Hand or Part Worn
Used tires with tread remaining 2.5 mm, 3 mm, 5 mm, and up.
Full range of passenger, light truck, truck, and aircraft sizes available.
Quality that makes you want to come back for more!
Tire Labeling - Passenger Vehicles
SIDEWALL OUTER CIRCLE
The "P" indicates the tire is for passenger vehicles.
This three-digit number gives the width in millimeters of the tire from sidewall edge to sidewall edge. In general, the larger the number, the wider the tire.
This two-digit number, known as the aspect ratio, gives the tire’s ratio of height to width. Numbers of 70 or lower indicate a short sidewall for improved steering response and better overall handling on dry pavement.
The "R" stands for radial. Radial ply construction of tires has been the industry standard for the past 20 years.
Rim Diameter Code
This two-digit number is the wheel or rim diameter in inches. If you change your wheel size, you will have to purchase new tires to match the new wheel diameter.
This two- or three-digit number is the tire’s load index. It is a measurement of how much weight each tire can support. You may find this information in your owner’s manual. If not, contact a local tire dealer. Note: You may not find this information on all tires because it is not required by law.
Severe Snow Conditions
The "M+S" or "M/S" indicates that the tire has some mud and snow capability. Most radial tires have these markings; hence, they have some mud and snow capability.
The speed rating denotes the speed at which a tire is designed to be driven for extended periods of time. The ratings range from 99 miles per hour (mph) to 186 mph. These ratings are listed below.Note: You may not find this information on all tires because it is not required by law.
|Q||99 mph||H||130 mph|
|R||106 mph||V||149 mph|
|S||112 mph||W||168 mph|
|T||118 mph||Y||186 mph|
*For tires with a maximum speed capability over 149 mph, tire manufacturers sometimes use the letters ZR. For those with a maximum speed capability over 186 mph, tire manufacturers always use the letters ZR.
source credit : www.nhtsa.dot.gov