Magnesium
The motorsport industry worldwide has recognised the advantages to be gained from using sand cast magnesium parts in alloys originally developed for the aerospace industry. Their lightweight and high strength to weight ratio provide many users with a competitive advantage. Many vintage and historic race teams continue the tradition of using wheels and auxiliary parts cast in magnesium alloys dating back as far as the 1920's 

Aluminium
Aluminium alloys are extensivly used in motorsport for critical engine componants, gearboxes, steering assemblies and suspension housings. Markets range from Formula One and Champ car to historic and club racing. Aluminium alloys are generally easier to cast and machine, with the added benefit of cost savings due to the availability of raw materials compared to Magnesium.