Quote:
Originally Posted by gearhead
By using tires (ST225/80R16 LRG) on a trailer designed for 6000# axles, the manufacturer has set the designated size so far above minimum standards for 6000# vehicle certified axles that all other load ranges in that designated size cannot be used.
CW....I've read this 3 times and dont understand what you're saying. Could you say that differently?
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"By The Book": The ST235/80R16 is a
designated tire size. Within that designation there are four load ranges built; they are D - E - F & G, each having a different maximum load capacities and all conform to the load inflation chart for that designated size.
The vehicle manufacturer is the
only authorized fitter for OEM tires and their recommended inflation pressures. NHTSA recognizes the OE tires, at the inflation pressures set by the vehicle manufacturer to be the
minimum standard for that fitment and publishes documents that support that fact.
When reading other NHTSA documentations you will find that replacement tires MUST provide a load capacity equal to or greater than the OE tires provide.
When the vehicle manufacturer sets a recommended tire inflation pressure for your trailer's tires and sets them at sidewall max, there is no deviation allowed. Optional inflation pressures start at what has been recommended and tire sidewall max. For tires already set at max, the only deviation is to go up a load range or to a plus sized tire approved by the vehicle manufacturer - see their options list, if they have one.
Remember, the ST235/85R16 is a designated size and considered a plus sized tire when compared to the ST235/80R16.