The BMW i5 Axle Beam transfers motor torque to the rear wheels while supporting weight. This enables every executive sedan to accelerate crisply and corner with poise. The Axle Beam is seated in a lightweight aluminum carrier that mitigates flex, funneling all the power from the BMW powertrain to the pavement without shudder or excess noise. The earlier versions of i5 featured an Axle Beam with a live axle that moved with springs. Even that setup was complimented for durability as its housing protected gears from debris on the road. The fixed Axle Beam now remains attached to the frame, allowing the suspension components to move independently, thus minimizing noise, calming ride motions, and ensuring an even tire contact patch, even on coarse asphalt. The Axle Beam is compatible with all i5 trims from the rear drive eDrive40 to dual motor xDrive editions. This means one design can support a variety of battery sizes and outputs and is also good news for BMW's parts logistics. The ring and pinion present an internal twisting that turns the rotation of the wheel ninety degrees. This mechanical piece along with spider gears allows for the turning of the wheels independently of each other. This key function increases safety when the weather turns slippery. Within the Axle Beam, there is optional limited slip tuning that can send equal power to both sides. As the BMW chassis mounts the Axle Beam rigidly, the i5 platform allows the regenerative braking energy to flow back into the battery efficiently while stability control algorithms can rely on predictable axle behavior. The i5 showcases BMW's solid hardware in terms of driver experience and strength. This component survives the high torque loads that are the norm with electric propulsion. The dependability is so great that BMW offers generous warranty coverage without a second thought for this part that typically never asks for attention after it's installed in the i5.
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