BMW E90 Sport Eibach D/T KBA 91401 Rear N/O/S Coil Spring Suspension Set

Visual condition of the part

The product shows signs of use visible in the photos.

BMW E90 Sport Eibach D/T KBA 91401 Rear N/O/S Coil Spring Suspension Set is a set of suspension springs designed for the rear axle of the BMW 3 Series E90, ideal for drivers who expect precise handling and stable vehicle behavior. The set ensures consistent, predictable suspension response and allows for maintaining the correct rear axle geometry. Thanks to its design tailored to the specific vehicle model, it is a practical solution for repairing or upgrading the chassis.

Specifications and technical data

• SKU: E90 SPORT EIBACH KBA 91401
• Mark: Unbranded
• Condition: Used
• OEM Part Number: E90 KBA 91401
• Substitutable numbers: E90 KBA 91401
• Location on the vehicle: Rear
• Category: Leaf & Coil Springs

Purpose and fitment for BMW E90

The presented spring set has been developed for the rear axle of the BMW 3 Series E90 generation, which translates into a proper fit for the original mounting points and correct compatibility with factory shock absorbers. The placement on the vehicle is limited to the rear suspension, allowing these components to be used for rear-only replacement without interfering with other sub-assemblies.

The springs belong to the Leaf and coil springs category, meaning they are responsible for supporting loads, maintaining vehicle height, and controlling suspension performance throughout the full range of travel. Using a dedicated set helps restore the correct operating characteristics of the rear suspension after the existing components have worn out or been damaged.

Technical and functional characteristics

The rear suspension spring set has been designed to provide stable body support during daily use as well as during more dynamic driving. The appropriately selected deflection characteristics promote tire grip, reduce excessive body roll, and improve the predictability of the car's response to road irregularities.

In practice, this means that after installation:

• the rear axle regains its proper stiffness and elasticity,
• the risk of body "floating" at higher speeds is reduced,
• the chassis operates more evenly across the full load range.

By using a set with consistent characteristics, you can avoid the disadvantageous phenomenon of uneven suspension performance between the left and right sides, which is particularly important for maintaining stability during braking and cornering.

Practical application and installation

The rear springs from this set are suitable both for standard replacement of worn parts and for post-accident repairs where it is necessary to restore factory suspension parameters. The product is intended for installation in place of the original springs, without the need for vehicle structural modifications.

Due to the specific nature of suspension components, installation in a specialized workshop is recommended, adhering to safety procedures and performing a geometry check after replacement. Properly performed installation allows you to fully utilize the benefits of the set, such as stable handling and a predictable rear axle response to load changes.

Product condition and benefits of choosing this set

The offered set comes from a brand classified as Unbranded, which in practice means a product outside the vehicle manufacturer's range, but functionally matched to the given model. The items have a used status, making them an attractive cost-effective alternative to new components while maintaining their functional role in the suspension system.

Choosing this rear suspension spring set allows for:

• restoring proper rear suspension performance without excessive costs,
• maintaining the correct body height relative to the axle,
• reducing unwanted vibrations and body roll during daily use.

Suspension upgrade expansion

If you are planning a comprehensive repair or upgrade of the suspension area in your BMW and need other items from the same group, such as additional springs, leaf springs, or complementary suspension components, check out the available parts in the Unbranded Leaf and coil springs category.

For drivers interested in a broader approach to drivetrain service and the proper selection of components that work with the suspension, a guide article describing the diagnostics and selection of clutch and dual-mass flywheel components may be helpful – you can find it here: Clutch and dual-mass flywheel – diagnostics and selection of drivetrain parts.