Personally I don't see why the same theory does not apply. just seems unrealistic to me to expect a tire to hold max weight or close to that, at only half of its rated air capacity.
One thing I read this evening, on tirerack.com about load ratings, is truck tires come in Load range C, D, E, etc. Each has its corresponding max air pressure, C=50psi, D=65psi, E=80psi.
On passenger car tires they says most are designed around a Standard Load rating at 35psi air pressure. And generally they don't mark anything on the tire for Standard Load rating. NO marking means SL. Then there is the LightLoad rating (LL still 35psi) and a ExtraLoad (XL at 41psi). And the 51 psi I read on the side wall is the max inflation pressure. And so "if" the 1201 lbs max load is really at 35psi of the Standard Load rating, then we are in really good shape running the classic 32psi most cars do. And probably why most cars are 32psi. -- 1201 / 35 is 34.3 lb per psi. My 1000lb load should only need 29.1psi going by the above formula. Probably why 26/27 gives best wear on a weight of a GL1800. The 32psi many like to run is well above whats needed for load support. -- Assuming 51psi is max inflation pressure and 35psi is Standard Load pressure.
On Edit. Using tirerack's tire selection filters they also show a Reinforced RF load rating. But I didnt see on the load rating page a psi pressure rating for that range.
2005 GL1800ABS 62,000mi
2003 ZG1000 133,000mi
Last edited by Slybones; 09-15-2016 at 03:06 AM.