The BMW i4 Control Arm helps anchor each front wheel to the chassis while allowing the movement of the suspension to remain smooth for providing the basic combination of sharp steering and ride comfort drivers expect. Built from stamped steel in early editions and from lighter cast aluminum or iron in later trims, the Control Arm has the benefit of resisting flex, shedding rust and trimming unsprung mass for superior energy efficiency. The component matches the precise geometry of every i4 variant, from the rear driven eDrive40 to the dual motor M50, so owners will experience consistent agility and signature BMW handling, regardless of the size of the battery or drivetrain. Its Control Arm ball joint and vibration absorbing bushings divert cornering forces through the struts rather than the cabin, which is a good idea for extending the life of the tires and protecting passengers. Because wear normally appears in those serviceable joints long before the arm itself deforms, the Control Arm has built up a reputation for long term reliability even on salty winter roads. Later cast versions also cut several kilograms per wheel, a small saving that multiplies across the axle of the i4 to sharpen throttle response and stretch range. Each Control Arm has been dimensioned to resist hard lateral loads without introducing harshness. Safety improvements are equally apparent as the Control Arm allows the wheel alignment to be held stable under hard braking, allowing the regenerative system to capture more energy without pulling off line. The part bolts directly to the flexible CLAR platform without modification and is thus fully compatible with factory ride height sensors, aerodynamic undertrays and the sophisticated stability software programmed for the i4. Shoppers appreciate how that combination of light weight, corrosion resistance and exact fit helps the BMW chassis retain the composed feel cherished in all the BMW lineup vehicles, keeping the i4 experience distinctly BMW. Finally, the BMW Control Arm is there as a silent powertrain support, which is why the i4 continues to be the benchmark for confidence and performance.
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