Quote:
Originally Posted by busterbrown
Load carrying capacity and any potential reserve capacity are not based on a tire's speed ratings. Sailun s637 and Goodyear g614s are heavy trailer tires speed rated for only 75 mph. Not clearly 106 mph but they have a great reputation of supporting the load.
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All tires have a maximum load capacity molded on their sidewalls. Now days just about all ST tires have speed letters above "K".
The relationship with a tire's speed rating and load rating goes sort of like this. The tire will support it's full load capacity up to it's speed rating. Thereafter, it starts degrading rapidly cutting months and even years off its potential life expectancy. (Depending on how close it is to its max load capacity).