Magnesium wheels have become more popular in the sport of karting. They are stiffer than aluminum wheels and can be used as a tuning tool to achieve the desired amount of grip.
Proper maintenance is important since magnesium wheels will crack or break rather than bend. Magnesium wheels should be inspected for cracks after any wheel to wheel contact occurs.
When beading up a tire on a magnesium wheel, hold the tire in a vertical position with the wheel facing to the side, not towards your face. If the wheel is cracked, it may explode sending pieces shooting out. I have seen this happen at a race with pieces landing 2 pits away.
Do not use an impact wrench when putting wheel nuts on magnesium wheels. Overtightening may cause cracks in the magnesium. This also applies to magnesium hubs. Do not overtighten!
Inspect your magnesium components regularly, and be safe!