|
(So a manufacture can misspec a tire and be alright?)
All the specifications a tire owner needs to know are on the tire sidewall. Many of the materials used by tire builders are kept confidential. The approving authority for those materials may be the Tire & Rim Association (TRA), they also keep it confidential.
(Like the Goodyear G159 on a motorhome. Let’s use one that is not so controversial, such as the G614.)
Because of its unique design qualities it qualifies for the LT prefix, yet it is registered for Regional Trailer Service (RST) and says, for trailer service only, right on it’s sidewall. Its carcass is of all steel construction and its tread cap is designed to be regrooved.
(Because they write the vehicle fitments.)
All original equipment tire fitments are the sole responsibility of the vehicle manufacturer. Their safety guidance comes from NHTSA via FMVSS.
(But I can’t change from a poly fabric casing construction, to an all steel casing construction.)
A polyester LT235/85R16 LRE tire has the same usability specs as a like sized steel cased tire. Same holds true for like sized ST tires.
(One that has a load rating greater than 50% of the axle it’s fitted to, plus a reserve and all at higher speed?)
The vehicle certified axles require tire fitments that meet the FMVSS minimum safety standards for fitment. With automotive tire fitments speed letters should all match. The only speed requirement for ST tires is they must be DOT certified for standard highway service. The GAWR axles do not limit the amount of load capacity of the tires fitted to them. All excess load capacity above the vehicle certified GARWs is considered load capacity reserves. Tire speed ratings are linked to its ability to carry its maximum load at greater speeds.
(And textile 101, many small cords in a bundle are stronger than the same size bundle of larger cords.)
There is no way to confirm that as that sort of tire information is confidential and may differ from builder to builder. When researching around you can find some ST manufacturers that state the building cords in ST tires are larger when compared to cords in LT or P tires. Thus they can carry much more weight than the LT or P tires with the same PSI per like sized tires.
Each tire identifies the basic material and number of cords and belts used in its construction. Size and tensile strength is not mentioned.
|
Threaded Mode
