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For superior ride and handling, the BMW i4 has fully independent front and rear suspensions. An independent suspension allows the wheels to follow the road at the best angle for gripping the pavement, without compromising ride comfort. The Mazda MX-30 has a rear torsion beam axle, with a semi-independent rear suspension.
The i4 has standard front and rear stabilizer bars, which help keep the i4 flat and controlled during cornering. The MX-30’s suspension doesn’t offer a rear stabilizer bar.
The rear suspension of the i4 uses air springs for a smoother, controlled ride than the MX-30, 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 MX-30’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 MX-30 doesn’t offer a load leveling suspension.
The i4 has vehicle speed sensitive variable-assist power steering, for low-effort parking, better control at highway speeds and during hard cornering, and a better feel of the road. The MX-30 doesn’t offer variable-assist power steering.
For a smoother ride and more stable handling, the i4’s wheelbase is 8 inches longer than on the MX-30 (112.4 inches vs. 104.4 inches).
For better handling and stability, the average track (width between the wheels) on the i4 is 1 inch wider in the front and 1.7 inches wider in the rear than the track on the MX-30.