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The rear suspension of the i4 uses air springs for a smoother, controlled ride than the C40 Recharge, which uses coil springs. Air springs maintain proper ride height and ride more smoothly.
The i4 offers an optional driver-adjustable suspension system. It allows the driver to choose between an extra-supple ride, reducing fatigue on long trips, or a sport setting, which allows maximum control for tricky roads. The C40 Recharge’s suspension doesn’t offer adjustable shock absorbers.
The i4 has a standard automatic rear load leveling suspension to keep ride height level with a heavy load or when towing. The C40 Recharge doesn’t offer a load leveling suspension.
For a smoother ride and more stable handling, the i4’s wheelbase is 6 inches longer than on the C40 Recharge (112.4 inches vs. 106.4 inches).
The i4 M50 handles at .96 G’s, while the C40 Recharge Ultimate pulls only .82 G’s of cornering force in a Car and Driver skidpad test.