Quote:
Originally Posted by Sugarphreak
True, when using max tire sidewall pressure blow outs are not a concern. Also there is some safety and comfort margin in the reccomended PSI of probably a couple of pounds.
However the tire is designed to be running with more weight at that pressure as it is a intended to fit a wide variety of vehicals. A giant heavy domestic car running the same tire will probably have a higher reccomended pressure. With that amount of pressure in the tire for a vehical which only reccomends 32psi you are without question not providing enough force downward to counteract the outward deflection that would naturally occur.
When it comes right down to it there is really no other way to explain why you get better MPG using higher pressures other than you are reducing surface area. Using that logic, if you reduce the surface area the points of contact will have more weight on them and will wear faster.
In this case we are seeing roughly a 9% increase in overall efficency. If we assume this directly relates to the tires then that is a 9% reduction of contact on the flat tread (highway's don't exactly roll the tire on corners so we can dismiss any rolling resitance along the side tread). With 9% less contact your wheels we can only assume the deflecting tire is also arching out to create that affect and has an substatial increase in weight right along the center that would not normally be there. So really the wear in the center of the tire would be somwhere between 10%-20% worse than a properly infalted tire.
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why do u think that the natural world runs on linear equations? y is usually NOT a lineal function of x!
i.e. if u DOUBLE your velocity u QUADRUPLE drag!!
uneven wear? STOP thinking 2 dimensionally!!!! instead of looking at the tire from a longitudinal direction from the car's perspective (bumper to bumper) and thinking that the tire becomes less square
looking at the tire axially (reading the sidewall perspective) the tire becomes more round with increased pressure while MAINTAINING sidewall squareness
therefore in conclusion-
increasing pressure will-
- REDUCE contact patch when looking at the tire from the side, but will generally stay the same from looking at the tire in a bumper to bumper perspective.
- increase MPG
- reduce braking (increase braking distance)
- increase turning responsiveness
- will increase cornering loads ( how fast u corner) TO A POINT then will decrease cornering loads (at what psi is optimal depends on many many many more variables
the internet is great but, back in the day u had to get info from more reputable sources like text books and magazines and such (accountability is paramount to science), instead of forums where it seems like most people failed and/or didn't take any math and science classes (not to bash forums but most people in general are scientifically illiterate)
i encourage everybody to disregard everything that i and everybody else have written and GO TO A LIBRARY and do some research and get info from reputable educated sources instead of looking into forums where even a six year old can post there "OPINIONS"!!!!!
if u want to get spoon fed chances are u are not gonna get the steak u want but just a mouthful of garbage
give a man a fish and they will eat for a day, teach a man to fish and they will feast for a lifetime.....