Dežru Suspension Spec-RS for 06-12 BMW E90 SPECRS-0612E90

Unlock the performance potential of your BMW 3 Series with the Dežru Spec-RS Coilover System, a performance-focused suspension package engineered for drivers who demand sharper handling, improved chassis control, and consistent response during spirited street driving and track use.

Designed for the BMW E90 sedan and E91 Touring platform, the Spec-RS combines digressive monotube dampers, remote reservoirs, 20-position rebound adjustment, and 500 lb/in front and 800 lb/in rear springs to deliver a more controlled and responsive driving experience. Whether you're tackling winding back roads, attending autocross events, or pushing through extended track sessions, this system is designed to provide a firm foundation for performance-oriented suspension tuning.

The digressive damper valving is designed to provide strong control during initial suspension movements, helping manage body motion under braking, corner entry, and rapid directional transitions. The remote reservoir configuration adds fluid capacity and supports heat management during sustained high-load driving, helping maintain consistent damping behavior under demanding conditions.

With fixed-length damper bodies and an adjustable lowering range of approximately 25–45 mm, the Spec-RS offers a purposeful stance while prioritizing suspension control and usable travel. The 20-position rebound adjustment allows drivers to refine damper response to suit their preferences, vehicle setup, and driving environment.

Linear performance springs and pillowball upper mounts further support the system's performance-focused design. The result is a suspension package for BMW enthusiasts seeking a sharper, more connected chassis without relying on spring stiffness alone to control vehicle movement.

Key Features

• Digressive monotube dampers: Designed to improve chassis control, transient response, and driver feedback.

• Remote reservoir configuration: Provides additional fluid capacity and supports heat management during sustained performance driving.

• 20-position rebound adjustment: Allows damper response to be tuned for street driving, autocross, and track use.

• 500 lb/in front spring rate: Provides a performance-oriented foundation for front-end support and steering response.

• 800 lb/in rear spring rate: Selected for the rear suspension's separate spring mounting arrangement, where motion ratio influences effective wheel rate.

• Linear performance springs: Deliver consistent spring behavior throughout suspension travel.

• Fixed-length damper bodies: Designed to support the intended lowering range and suspension setup.

• Adjustable ride height: Offers approximately 25–45 mm of lowering for a tailored stance.

• Pillowball upper mounts: Designed to provide a more direct suspension connection and support alignment consistency.

• Hand-built, dyno-matched dampers: Designed to maintain consistent damping characteristics between paired units.

• Street and track versatility: Suitable for performance-focused builds used on winding roads, autocross courses, and race tracks.

Performance Character

Improved Chassis Control

The Spec-RS is designed to help reduce excessive body movement during braking, cornering, and rapid transitions. This can provide a more composed feel when entering corners and changing direction under demanding conditions.

More Responsive Steering

The combination of digressive damping and pillowball upper mounts aims to deliver a more direct connection between driver inputs and chassis response. Actual steering feel depends on alignment, tires, suspension geometry, and vehicle configuration.

Performance-Focused Rear Suspension Support

The 800 lb/in rear spring rate is intended to account for the E90/E91's separate rear spring mounting arrangement. The resulting wheel rate depends on suspension geometry and motion ratio, so the nominal spring rate alone does not determine rear stiffness or handling balance.

Consistency During Demanding Driving

The remote reservoir design supports thermal management during repeated high-load use. Combined with adjustable rebound damping, it provides a foundation for tuning the suspension to suit the vehicle and intended driving conditions.

Adjustable Lowered Stance

The approximately 25–45 mm lowering range allows you to refine the vehicle's ride height for a more purposeful appearance and performance-oriented setup. A professional alignment is recommended after installation or ride-height adjustments.

Why Choose 500 lb/in Front and 800 lb/in Rear Spring Rates for the BMW E90/E91?

The BMW E90/E91 uses a front strut suspension and a rear suspension with a separate spring and damper. Because the rear spring is mounted inboard of the wheel, its effective wheel rate depends on the suspension motion ratio. As a result, the nominal front and rear spring rates should not be compared directly without considering their mounting geometry.

The Dežru Spec-RS 500 lb/in front and 800 lb/in rear spring combination is intended for performance-focused suspension tuning. The front spring rate provides a firm foundation for managing front suspension movement during braking and corner entry, while the rear spring rate is selected with the separate rear spring mounting arrangement in mind.

The springs work alongside the digressive dampers to manage chassis movement during cornering, braking, acceleration, and directional transitions. The 20-position rebound adjustment allows drivers to refine suspension response within the system's available range.

The intended benefits include:

• Improved control during braking and corner entry.

• More responsive chassis behavior during directional transitions.

• A performance-oriented spring and damper combination.

• Adjustable rebound damping for different driving conditions.

• A lowered stance with approximately 25–45 mm of adjustment.

• Additional reservoir capacity to support thermal management during sustained performance use.

Spring rates alone cannot guarantee a neutral handling balance or a specific level of grip. The final result also depends on suspension geometry, motion ratios, anti-roll bars, alignment, tires, vehicle weight, and damper settings. For competitive use, the setup should be validated for the exact vehicle configuration and intended application.

Who Is the Dežru Spec-RS For?

The Spec-RS is suited to BMW E90/E91 owners who want to:

• Develop a performance-focused street or track suspension setup.

• Improve chassis response during aggressive cornering.

• Fine-tune rebound damping to suit their driving preferences.

• Benefit from remote reservoirs during demanding driving.

• Use pillowball upper mounts for a more direct suspension connection.

• Lower the vehicle for a more aggressive stance.

• Build a suspension setup around their tires, alignment, and performance goals.

What's Included?

The exact package contents should be confirmed against the supplied product part number. Based on the described configuration, the system includes a matched front and rear coilover assembly, springs, adjustable dampers, and the specified mounting hardware. Confirm whether remote reservoirs, pillowball upper mounts, and all installation hardware are included before publishing the final listing.

Vehicle Fitment

Make: BMW
Model: 3 Series
Chassis: E90 sedan / E91 Touring
Model Years: Confirm the exact application with the manufacturer before publishing a combined 2006–2012 year range.

Fitment note: The E90 sedan and E91 Touring are different body styles, and suspension compatibility may vary by model year, engine, drivetrain, and factory suspension configuration. The E92 Coupe and E93 Convertible should not be assumed compatible. The E90 M3 also uses different suspension applications from non-M 3 Series models; verify the exact kit part number before listing fitment.

Disclaimer: This product is built to order. Please allow approximately 3–4 weeks for production before shipment.