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The 8 Series Gran Coupe has standard front and rear gas-charged shocks for better control over choppy roads. The CLS’ suspension doesn’t offer gas-charged shocks.
The 8 Series Gran Coupe M550i/Alpina B8 has active sway bars, which help keep it flat and controlled during cornering, but disconnect at lower speeds to smooth the ride and offer greater off-road suspension articulation. This helps keep the tires glued to the road on-road and off. The CLS doesn’t offer an active sway bar system.
The 8 Series Gran Coupe M550i/Alpina B8 offers an available active suspension system, which counteracts cornering forces actively, limiting body roll and improving handling and stability. Mercedes doesn’t offer an active suspension on the CLS.
For a smoother ride and more stable handling, the 8 Series Gran Coupe’s wheelbase is 3.3 inches longer than on the CLS (119 inches vs. 115.7 inches).
For better handling and stability, the average track (width between the wheels) on the 8 Series Gran Coupe is .2 inches wider in the front and 1.6 inches wider in the rear than the track on the CLS.
The 840i Gran Coupe xDrive handles at .92 G’s, while the CLS 450 4MATIC pulls only .90 G’s of cornering force in a Motor Trend skidpad test.
The 840i Gran Coupe xDrive executes Motor Trend’s “Figure Eight” maneuver quicker than the CLS 450 4MATIC (25.1 seconds @ .74 average G’s vs. 25.8 seconds @ .72 average G’s).