[3] The Speedtail is powered by a version of the M840T twin turbocharged V8 engine from the 720S, upgraded to produce 746 hp; 556 kW (756 PS) and 590 lb⋅ft (800 N⋅m) of torque.

[4][5] The Speedtail uses a carbon fibre monocoque, with the passenger seats integrated into the chassis, as well as dihedral doors like other McLaren models.

[6] To achieve this, the design is inspired by the shape of a teardrop and features carbon fibre static covers on the front wheels.

Similarly, the Speedtail does not feature door mirrors, instead using HD cameras mounted on the front guards that pop out when the ignition is turned on and retract inside when the "Velocity mode" is activated, which reduces overall drag and optimizes performance.

[12] The Speedtail has a 3-seat layout, similar to the preceding F1, which has the driver sitting at the centre of the car, and slightly forward of the two passenger seats.

Due in part to its use of cameras in place of side mirrors and no side-mounted airbags, the Speedtail does not meet Federal Motor Vehicle Safety Standards (FMVSS) in the United States, even though around 35% of the total cars were bought by American buyers.