That is one of the dumbest statements I've read here.
S197 GT verts and coupes have a weight difference. Why do they come with the same rims and tires? Please enlighten us.
You are digging a bigger hole for yourself but be my guest.
Why would them had to change if the same tire can hold the load of a vert???? What does this has to do with tire sizes????? What may change (or not) is the recommended tire pressure from a coupe to a vert (I have no access to verts because there is none down here) given the weight difference NOT THE TIRE.
You said:
Mister Roper said:
Insignificant - you don't change the pressure when you're hauling 3 passengers. I would put them at whatever it states on the sidewalls.
The weight differences of these two cars is not insignificant. (3920 for the GT500, 3483 for the GT, both coupes), you are talking about more than 400lbs more, that is not insignificant, both cars can hold the same amount of passengers and baggage so its final load is more and it is obvious that the GT500 came with a higher pressure recommendation.
Weight is the most important thing to take into account at the time of considering a tire pressure. When we raced we had a group of caterham super 7s, this is a 1000lb car, it uses standard 15" or 16" rims with typical street tyres that you would see inflated about 26-28 on a normal street car, well, in this tiny thing they only use 14-18psi.
You also said that "I would put them at whatever it states on the sidewall" that is another common mistake, the pressure expressed in the tirewall is usually the MAX pressure at the MAX load specified on the load rating. In some cases they also specify a minimal pressure too. They cannot show the recommended pressure because they don't know how it will be loaded so inflating a tire for what the sidewall say is a huge and common mistake too.
Ford, as many other manufacturers just stamp a single recommended tire pressure for simplicity, as I said you before other manufacturers go the extra length and make a more detailed info with their cars. Do you want proof? here you have a picture after a single search on the web:
There you go, proof me wrong.
BTW, you can make my boxes red all you want but that won't make you right.