Polestar 4 is the fastest production car the brand has developed to date. The 0-100 km/h acceleration time is 3.8 seconds [3] and maximum power output is 400 kW (544 hp). Motors are a permanent magnet, synchronous design. Both dual- and single-motor variants are available, with the single-motor using rear-wheel drive. Semi-active suspension is used in the dual-motor version for an additional layer of adjustment between comfort and performance dynamics. Wheels range from 20 to 22-inches in size, with tires supplied by Pirelli and Michelin, depending on configuration.