Quote:
Originally Posted by Golfmedik
That's why Sailun tires have a S637 235/80/16 tire that has a load capacity of #4080 and they added the 235/85/16 two years ago with a load capacity of #4400 to meet the upcoming RVIA reserve requirements. However, most places are putting them wheels only rated to #3750. Now Tredit Tire sells several wheels in aluminum and steel that rated for #4400.
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Designated sizes, such as the ST235/80R16 can be ordered and fitted with load ranges D - E - F - & G. They all conform to the same load inflation chart. Therefore, they all conform to a vehicle certification label that describes that designated size as an appropriate fitment. The same holds true for any designated size. Load and speed information are not part of a designated size. Those characteristics have separate forms of descriptions on the tire sidewall.
The correct tire load capacity description for LT & ST tires is the load range lettering system. For P & Euro Metric tires it’s the load index numbering system. All speed ratings are identified by a lettering system, usually found at the end of a load index number.
The basic rule for wheel capacity is not to exceed PSI capacity or load capacity. For instance; the steel cased LT235/85R16 LRG has a maximum load capacity of 3750# @ 110 PSI. The ST235/80R16 LRG has a 4080# load capacity @ 110 PSI. A 3750# wheel with a 110 PSI rating can be fitted with any tire with a higher load capacity as long as the wheel is not going to have to support more than 3750#. So, if you’re putting those wheels on 7000# certified axles they cannot be overloaded unless you overload the axles.
There is a caveat in the rules that states tire manufacturers must identify proper wheels for their tires. They normally refer that back to the wheel manufacturer. In the following reference you can see that Sailun has done that.
http://gosailun.com/MRT/Tire/S637T