Ric, From what I've seen,improper storage is the most harmful thing for any type of wheel. If its too damp,or they're stored directly on a concrete floor,corrosion goes crazy.Im not totally certain about Magnesium,but I scouted a pretty nice set of aluminum ET's ,but wasn't able to get them until a couple of years later. The chalky,crumbling corrosion had eaten the interior of the spokes til you could break pieces off with your fingers.But you lucky dogs out in California don't have all those troubles like us poor chumps up north,do you! I would love to have enough power to break wheels though! Scott Posted using the Full Custom H.A.M.B. App!