Product Details
BC Racing RM Series Coilovers for the 2015-2020 BMW 4 Series (F32/F36) are purpose-built for McPherson-strut cars that see serious track time, with an inverted mono-tube damper engineered to outlast a hard season of lateral loads. Every kit is extensively tested on the 4 Series chassis and refined until it balances ride quality with performance — the reason 4 Series coilovers from BC Racing are the best-selling adjustable kits in their segment worldwide.
The RM Series inverts the mono-tube damper on strut-equipped chassis, putting the heavy internals where the lateral loads are worst. A wider piston shaft than conventional uprights means more consistent damping on long sessions and more fatigue life before rebuild. The off-the-shelf setup from BC Racing is deliberately balanced — spring rates and valving chosen so the kit feels comfortable day-to-day without giving up performance when you push it. Drivers who want a different recipe can spec Swift Springs, custom spring rates, or fully custom valving at checkout; BC will tune the dampers to match, which is a depth of customization most brands only offer on their top-tier kits.
Since 2004, BC Racing has grown into one of the most trusted names in aftermarket coilovers — not by racing to the bottom on price, but by pairing that price with real build quality, deep customization options, and a damper design any suspension shop can rebuild instead of replacing. These 4 Series coilovers arrive tuned for the 4 Series chassis and ready to bolt in — no break-in period, no guessing at setup. Every kit ships with a 2-year manufacturer warranty, lifetime access to BC service parts (pistons, seals, shafts — no unit replacement required when it's time for a rebuild), and in-house tech support from both BC Racing and the Springrates team.
Features
- 30-level simultaneous compression/rebound damping adjuster
- Inverted mono-tube damper (front) with oversized 46 mm piston shaft
- Handles higher lateral loads on McPherson-strut applications
- Ride height adjustable independent of spring preload
- Upper mount hardware varies by chassis — camber plates, pillowball, or reused OEM mounts. See the Specifications table for what's included on your kit.
- Swift Spring and custom spring rate upgrades available at checkout
- Custom damper valving paired with custom spring rates on request
- Fully rebuildable — replacement parts available from BC for the life of the shock
- 2-year manufacturer warranty against defects
Specifications
| Part Number | I-84-RM |
| Part Name | RM Series Coilovers |
| Vehicle | 2015-2020 BMW 4 Series |
| Drivetrain | RWD |
| Chassis Code | F32/F36 |
| Damping Adjustment | 1-Way (30 levels) |
| Ride-Height Adjustable | Yes |
| Spring Rate - Front | 6 kg/mm |
| Spring Rate - Rear | 12 kg/mm |
| Spring Size - Front | 62-170-6K |
| Spring Size - Rear | 62-220-12K |
| Swift Springs - Front | 62-178-X |
| Swift Springs - Rear | 62-228-X |
| Camber Plates - Front | Included |
| Camber Plates - Rear | Not Applicable |
| Suspension Design - Front | True Coilover |
| Suspension Design - Rear | True Coilover |
| Notes | Vehicle has 5-bolt top mounts — verify before ordering. |
Vehicle Fitment
- 2015 BMW 4 Series RWD (F32/F36)
- 2016 BMW 4 Series RWD (F32/F36)
- 2017 BMW 4 Series RWD (F32/F36)
- 2018 BMW 4 Series RWD (F32/F36)
- 2019 BMW 4 Series RWD (F32/F36)
- 2020 BMW 4 Series RWD (F32/F36)