Description
BMW M3/M4 Competition (Rear Integrated) AWD G80/G82 (21+) BC Racing ER Series Coilovers | 6.5/6.5kg.mm
Experience championship-level handling with BC Racing ER Series Coilovers engineered specifically for the BMW M3/M4 Competition (Rear Integrated) AWD G80/G82 (21+), featuring a precisely tuned 6.5/6.5kg.mm spring rate that delivers responsive performance and superior damping control. These street-focused coilovers combine adjustable ride height with independent compression and rebound tuning, making them the ideal choice for drivers seeking refined suspension dynamics without compromising daily drivability. Whether tackling challenging UK roads or track days, the BC Racing ER Series provides the predictable feedback and stability your high-performance BMW demands.
BC Racing ER Series Coilovers
The BC Racing ER Series brings with it the high quality and unique features of the BR and DS Series, with the additional benefit of external reservoirs and the ability for the driver to individually adjust and set compression and rebound damping rates. Separating the adjustment for compression and rebound allows the car to be dialled in to exact requirements — a level of precision not available with a single combined adjuster.
Key Features
- Digressive piston and damping curve
- 30 clicks of compression adjustment via the external reservoirs
- 30 clicks of rebound adjustment from the top of the damper
- Ride height adjustment separate to spring preload
- Monotube damper design
- Pillowball top mounts
- 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
Separate Compression and Rebound Adjustment
Compression damping controls how the car transfers weight to its tyres during braking — allowing the front to load progressively for maximum braking grip and enabling trail braking into a corner. Rebound damping controls how the suspension responds as load is released on corner entry, keeping the front end hooked up rather than snapping back and causing understeer. Tuning each independently, without one adjustment affecting the other, is a significant advantage for circuit use — corner exit speed is ultimately determined by how well the front stays loaded through the entry phase, and that comes down to the balance between compression and rebound.
Kit Specifications
- Fitment: BMW M3/M4 Competition (Rear Integrated) AWD G80/G82 (21+)
- Spring Rate: 6.5/6.5kg.mm
- 30 Clicks Compression (via Reservoir) + 30 Clicks Rebound (Independent)
- 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 | M3 |
| Chassis | BMW M3/M4 Competition (Rear Integrated) AWD G80/G82 (21+) |
| Series | ER |
| Spring Rate | 6.5/6.5kg.mm |
| Part Number | I-135-ER |