Palmer today confirmed that the fatal injury occurred in the collision with the wheel and that the impact at the following corner did not contribute to his death.
Formula One-style wheel tethers, designed to reduce the risk of tyres coming loose in an accident, are mandatory in the series, but Palmer admitted the system was not 100% effective.
"The Williams F1-designed Formula Two cars comply with the FIA 2005 F1 safety standards including the fitment of wheel tethers to reduce the risk of wheels coming off in accidents," Palmer continued.
"The F2 car also includes the latest F1 standards of driver head protection with high cockpit sides and lateral deformable structures.
"As with F1, however, wheel tethers cannot provide an absolute guarantee that a wheel will not come off in an accident and in a single seater race car the front of the head is inevitably exposed to the risk, however small, of being hit by another car or component."
This really puts the emphasis on better run offs and barriers that would prevent components like wheels from coming back on the track by reducing impact energy of the car in the first place. One could also look into making helmets even stronger.