Mercedes introduced a concave rear brake drum at the 2018 Singapore Grand Prix, in combination with the unique rear wheel rim design developed at 2018 Belgian Grand Prix. The innovative design was to reduce rear tyre temperatures from getting too high, allowing temperature closer to the optimum threshold, by gradually building up the rear tyres' core temperature while not overheating its surface. The concave design of the carbon fibre aero-drum around the disc creates an air pressure difference around the wheel rim which causes the hot air to be extracted even faster.