Cadillac V-Series Blackwing Cars to Use Mag Wheels by Sebastien Bell October 30, 2020 Share Comments Cadillac is planning to reduce the unsprung mass on its CT4-V and CT5-V Blackwing by making their wheels out of magnesium. They will be the only GM products to offer mags in the near future, says Cadillac. The reasons are pretty simple. Magnesium has the highest strength to weight ration of any commonly-used metal, it absorbs vibrations, and Cadillac already uses it in its DPi-V.R race car, which races in IMSA. In fact, Cadillac isn’t the only brand to use mag wheels. The technology has been used in motorsports for years, including Formula 1, MotoGP, and Le Mans, and more. The fact that it absorbs bumps is also good. While Ford is offering wheels made of fancy carbon fiber, which is very strong and light, it is also very stiff and prone to shattering when pushed beyond the limits of its strength. While I’m sure Ford has a solid strategy for dealing with broken wheels, the fear of shattering was at least enough to keep Gordon Murray, designer of the McLaren F1, from using it on his latest supercar, the GM01. No news yet on how heavy the wheels will be exactly, though we’d expect that information to be shared once Cadillac unveils its upcoming Blackwings, which go on sale in the summer of 2021.