PSI

TUCQUALA wrote:
Ok, ready for the shootout!!!

Has anybody out there replaced C rated with D rated on orig wheels (rated for C)??? In other words installed a tire which has a max inflation pressure 10 to 15# above the wheel rating??

Just a wondering aboot moment!!!!

Moment as an engineering term?

If so, yes there is lever arm on all of the wheel types we talk about
here


tirerimbead
This image is of a bicycle wheel, but not much different to automotive
with a bead on the wheel. The 'moment' or 'lever arm' is the upright
from the horizontal portion of the wheel

The tire bead works to try and bend that rim bead. The more PSI, the
greater the force trying to bend that rim bead

I've personally worked on a cracked steel wheel when working as a tire
monkey through college. He had been to another tire shop and they just
put a new tire on...leaked and then put a tube in a tubless tire, so
it went flat from the tube rubbing inside of a tubeless tire

It was a wheel with a 'P' class rating and they put in a higher class
tire with it's higher PSI requirements

How much will it take to crack a rim? No idea, as with the flexing
and the weight involved as factors...must say it depends...





These are crack rim beads. Don't know what from, but typically from
over pressure (PSI). Few know that all wheels flex when rolling and
the above moment (lever arm) is in a continual flexing to fatigue the
metal (both steel and alloy)

rimcrack

rimbeadcrack

beadcrack

wheelbeadcrack

wheelrimcrack

PS...put the wording underneath my images as a shorthand to find them
next time and not have to log into my web hosting site...yeah...lazy