BMW M3/M4 3-BOLT F80/F82 14-18 BC Racing BR Series RN Coilovers | 6/12KG.MM

BMW M3/M4 3-BOLT F80/F82 14-18 BC Racing BR Series RN Coilovers | 6/12KG.MM

BC Racing BR Series RN Coilovers deliver precision suspension performance for the BMW M3/M4 3-BOLT F80/F82 14-18, engineered with a 6/12KG.MM spring rate and featuring no top mount design on both front and rear setups. These track-focused coilovers combine adjustable damping characteristics with a rigid construction ideal for drivers demanding responsive handling and superior cornering control. Perfect for serious enthusiasts seeking competitive edge and refined chassis dynamics, the BC Racing BR Series RN represents a sophisticated suspension solution built for demanding road and circuit conditions.

BC Racing BR Series Coilovers

The BC Racing BR Series offers entry into coilover suspension without sacrificing performance, comfort, build quality or handling. Each kit is developed through extensive vehicle-specific testing and refinement, ensuring the most well-balanced and affordable aftermarket suspension possible for each application. The BR series coilovers use a large 46mm diameter piston in a 53mm diameter damper body — as the damper operates, oil temperature rises and viscosity changes, which can alter damping characteristics. The enlarged 53mm body increases oil capacity, reducing the peak temperature and maintaining more consistent damping performance as a result.

Key Features

• 30-way adjustable damping
• Monotube damper design
• Ride height adjustment separate to spring preload
• Tapered bottom mount locking collar to prevent collar working loose
• Pillowball top mounts (depending on model)
• Bearing mounted upper spring platform
• Camber adjustable top mounts (depending on model)
• Custom spring rates available
• All spare parts available with low lead times
• Dust boot to protect damper seals
• 1 year manufacturer warranty

30-Way Damping Adjustment

A single adjuster controls both compression and rebound simultaneously, giving a wide tuning range without the complexity of separate circuits. The balance between front and rear axles can be shifted to influence handling — the effect is repeatable and noticeable across the 30 positions of adjustment.

Ride Height Independent of Spring Preload

Ride height is set via the bottom mount rather than the spring platform, meaning full damper travel is retained at any ride height chosen. The tapered bottom mount locking collar locks the setting securely without requiring tools to recheck after every session.

The RN configuration is supplied without front top mounts — designed to reuse the OEM front top mount — and with rubber rear top mounts or no rear top mounts depending on the application.

Kit Specifications

• Fitment: BMW M3/M4 3-BOLT F80/F82 14-18
• Spring Rate: 6/12KG.MM
• 30-Way Combined Damping Adjustment
• Front Top Mount: No Top Mount
• Rear Top Mount: No Top Mount
• 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