BMW 3 SERIES (strut 45mm) RWD E21 (75-83) BC Racing DS Series Coilovers | 5/4.5kg.mm

BMW 3 SERIES (strut 45mm) RWD E21 (75-83) BC Racing DS Series Coilovers | 5/4.5kg.mm

BC Racing DS Series Coilovers for the BMW 3 SERIES (strut 45mm) RWD E21 (75-83) deliver premium suspension tuning with a responsive 5/4.5kg.mm spring rate engineered for responsive handling and ride comfort. These adjustable coilovers provide independent damping control and height adjustment, making them ideal for both road-focused driving and trackday enthusiasts seeking proven performance upgrades. Built on BC Racing's renowned DS platform, these coilovers combine durability with precision fitment specifically tailored to your classic 3 Series platform.

BC Racing DS Series Coilovers

The BC Racing DS Coilover system is built with digressive valving, offering the same great benefits of the BR Series and is considered a perfect choice for those looking for track-biased coilovers. The digressive piston design produces a non-linear damping curve — allowing higher low-speed damping to control body roll through cornering, acceleration and braking, while providing reduced high-speed damping to allow the wheel to travel when running kerbs, preventing the impact from transmitting fully into the shell and retaining car balance.

Key Features

• Digressive piston and damping curve
• Satin chrome finished shock body
• 30 clicks of simultaneous rebound and compression adjustment
• Ride height adjustment separate to spring preload
• Monotube damper design
• Pillowball top mounts (depending on model)
• Bearing mounted upper spring platform
• Camber adjustable top mounts (depending on model)
• Tapered bottom mount locking collar to prevent collar working loose
• Custom spring rates available
• All spare parts available with low lead times
• Dust boot to protect damper seals
• 1 year manufacturer warranty

Digressive Piston Valving

Unlike a conventional linear piston, the DS digressive design increases damping force at low piston velocities — the range associated with body roll, pitch and dive during driven inputs — while reducing damping force at high piston velocities, such as when a wheel travels over a kerb. This keeps the car stable during cornering loads while allowing impacts to be absorbed without upsetting the chassis balance.

Kit Specifications

• Fitment: BMW 3 SERIES (strut 45mm) RWD E21 (75-83)
• Spring Rate: 5/4.5kg.mm
• 30-Way Combined Damping Adjustment
• Monotube Damper Design
• Full Ride Height Adjustment (via Bottom Mount)
• Adjustable Spring Platforms for Corner Weighting
• Tapered Bottom Mount Locking Collar
• Custom Spring Rates Available
• All Spare Parts Available
• 1 Year Manufacturer Warranty