Description
BMW 3 Series Sedan (5-BOLT) F30 (12+) BC Racing BR Series RN Coilovers | 5/9kg.mm
The BC Racing BR Series RN Coilovers deliver precision suspension tuning for the BMW 3 Series Sedan (5-BOLT) F30 (12+), engineered with a 5/9kg.mm spring rate and no-top-mount design on both front and rear axles for maximum adjustability and performance. These coilovers are purpose-built to enhance handling dynamics and ride quality on one of the UK's most popular performance saloons. Whether you're optimising street performance or track capability, the BC Racing BR Series provides the advanced damping control and lowering range that serious drivers demand.
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 3 Series Sedan (5-BOLT) F30 (12+)
- Spring Rate: 5/9kg.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
Fitment Data
| Make | Bmw |
| Model | 3 Series |
| Chassis | Sedan (5-BOLT) F30 (12+) |
| Series | BR |
| Type | RN |
| Spring Rate | 5/9kg.mm |
| Front Top Mount | No Top Mount |
| Rear Top Mount | No Top Mount |
| Part Number | I-80-BR-RN |