The car sits on 20-spoke forged alloy wheels measuring 19 inches across up front and 20 in at the rear. Rubber is Pirelli’s track-focused P Zero Trofeo R and the set on the 675LT Spider has been specifically designed for the car.

The engine is the standard twin-turbocharged 3.8-liter V-8, but tuned to deliver 666 horsepower and 516 pound-feet of torque.

McLaren quotes a dry weight of just 2,800 lb, which is around 88 lb heavier than the coupe because of the roof system. Much of the car's construction is carbon fiber, including the roof.

The name is an homage to McLaren’s F1 GTR Long Tail race car, and the 675LT Spider utilizes a longer rear section which boosts downforce. The car’s air brake is also twice as large as the one on the 650S Spider.

At the front, there is an extended front splitter flanked by front wing end plates to increase front downforce. Overall, it's a 40 percent increase in downforce over the 650S Spider.