Product Details
BC Racing HM Series Coilovers for the 2000-2006 BMW 3 Series Convertible (Non-M3) (E46) combine the inverted-damper durability of the RM Series with the independent compression and rebound tuning of the ER Series — BC's pick for track-day McPherson-strut builds. Every kit is extensively tested on the E46 chassis and refined until it balances ride quality with performance — the reason 3 Series Convertible (Non-M3) coilovers from BC Racing are the best-selling adjustable kits in their segment worldwide.
HM Series kits use an inverted mono-tube damper on McPherson-strut chassis (upright on double-wishbone) with external reservoirs feeding separate compression and rebound adjusters. The result: the tuning depth of the ER Series inside the heavy-load chassis architecture of the RM. 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.
BC Racing has been manufacturing adjustable coilovers since 2004 and is one of the most popular coilover brands in the automotive tuning industry for a reason: competitive pricing, deep customization, proven reliability, and a fully rebuildable damper design that lasts years instead of seasons. These 3 Series Convertible (Non-M3) coilovers arrive tuned for the E46 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 rebound adjustment (top of damper)
- 30-level compression adjustment (external reservoir)
- Inverted mono-tube damper on McPherson-strut vehicles; upright on double-wishbone
- Combines RM Series inverted-damper architecture with ER Series 2-way adjustability
- 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-90-HM |
| Part Name | HM Series Coilovers |
| Vehicle | 2000-2006 BMW 3 Series Convertible (Non-M3) |
| Drivetrain | RWD |
| Chassis Code | E46 |
| Damping Adjustment | 2-Way (30 levels rebound / 30 levels compression) |
| Ride-Height Adjustable | Yes |
| Spring Rate - Front | 6 kg/mm |
| Spring Rate - Rear | 8 kg/mm |
| Spring Size - Front | 62-180-6K |
| Spring Size - Rear | 62-150-8K |
| Swift Springs - Front | 62-178-X |
| Swift Springs - Rear | 62-152-X |
| Camber Plates - Front | Included |
| Camber Plates - Rear | Not Applicable |
| Suspension Design - Front | True Coilover |
| Suspension Design - Rear | True Coilover |
| Notes | The HM Series is not available in Extreme-Low configuration. |
Vehicle Fitment
- 2000 BMW 3 Series Convertible (Non-M3) RWD (E46)
- 2001 BMW 3 Series Convertible (Non-M3) RWD (E46)
- 2002 BMW 3 Series Convertible (Non-M3) RWD (E46)
- 2003 BMW 3 Series Convertible (Non-M3) RWD (E46)
- 2004 BMW 3 Series Convertible (Non-M3) RWD (E46)
- 2005 BMW 3 Series Convertible (Non-M3) RWD (E46)
- 2006 BMW 3 Series Convertible (Non-M3) RWD (E46)