Tireman9 wrote:
NC Hauler wrote:
Tireman9 wrote:
As we all know it is the air that carries the load. Basically the more air volume (larger tire) and higher inflation pressure the higher the load capacity.
Now as we also know it is Heat that kills tires the faster rubber is "bent" through deflection the hotter it gets. A tire of size S and Load L at inflation pressure P will run hotter if it is run at speed 75 mph i.e. more bends per minute than when run slower say at 65 mph.
Now it is possible to vary L and/or P to achieve the same temperature when a tire is run at 75 as when at 65.
I do not understand the apparent confusion about these basic engineering principles.
If a tire company wants to provide a special 'non-standard" tire for a small special part of the tire market by using a "non-standard" set of Load, Pressure and Speed then I see no reason to be confused. I would think RV owners should be glad that a tire company made an effort to provide more options to the RV owner.
You've "assumed" several things in your above post. "Now as we also know" is presuming that "we also know"..... what you know from 40 years in the business...most don't know.
Next is your statement:" I do not understand the apparent confusion about these basic engineering principles." Not everyone is an Engineer and not everyone knows, "basic TIRE Engineering principles" or formula's for said processes....My Engineering education started out in 1968 in Electrical Engineering, then US Air Force, then I changed fields in 75' to Mining Engineering, nothing about tire manufacturing processes in either of those two fields...The rest, through my life has come with more schooling and "OJT" . All that to say, I can't assume most would know "basic principles" of particular fields...Thus, the reason for ALL the many threads on tire education/misinformation/information.
I would say that most rv owners are oblivious to tire information on rv's.. until they hit a forum like this or do the research. Until I got into some tire manufacturing myself YEARS ago with my company, I wasn't aware of all the specifics or "formula's" until I was involved in the manufacturing process. Same with ABS, ESC/ESP systems and brake calipers, it all comes with education and on the job training..So if I discuss these components with someone asking questions about them, , I don't 'assume" everyone knows how they work or the R&D put into the development and manufacturing of said products...
Thus the reason for all these tire threads and any other threads asking for information on "whatever" that come up on these and other forums...
NC you are correct and I was wrong to write in the manner I did. My appologies. I've been spending too much time with the folks that read my RV Tire Blog where these concepts have been covered.
Hey, no big deal....I've done the same thing explaining ABS systems, brake calipers, even Mining certifications years and years ago...and I'd really thought some of the people I dealt with years ago would have been all over understanding those laws especially when it came to methane monitoring systems in the coal mines. I understand, I really do..:)
