Why do aluminum and crhome rims lose beads
I can understand the chrome part, Chrome is pretty slick, but I really can't figure out why aluminum rims lose beads. Today I finally got out to do a little wheeling. We had a group of 4 Jeeps. The guy with chrome rims never airs down under 7PSI, because we will lose a bead, even at 7 PSI, the beads leak, and slowly loses air. We also had a guy wit aluminum rims with us. He really didn't lose a bead but snow got pack between the rim and tire causing it to leak. Not sure what PSI he was running. I run painted spoke rims, and regularly run 2 psi in deep snow, but was only down to 4 PSI today. In 4 years of wheeling with these rims, and low air pressure, I have yet to lose a bead. The only time I lost a bead was when I borrowed the first guys chrome rims and his tires, Poped a bead at 8 PSI. Maybe my question should have been, Why do painted steel wheels hold on to the bead so well?