Product Details
BC Racing HM Series Coilovers for the 1987-1992 Mazda RX-7 (FC3S) 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 FC3S chassis and refined until it balances ride quality with performance — the reason RX-7 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. Where BC Racing separates itself is tuning philosophy: every off-the-shelf spring rate and damper setup is chosen to stay comfortable on daily roads while still delivering real performance at the track. If you want something different, Swift Springs, custom rates, and custom valving are all options at checkout — BC will match the valving of the dampers to whatever springs you pick, something most brands don't offer outside their flagship race lineup.
BC Racing's reputation in the aftermarket suspension world is built on four things: competitive pricing that beats the rest of the fully-adjustable market, customization depth that rivals the top-tier race brands, long-term reliability earned over 20 years of production, and a rebuildable design that keeps the same set of dampers serving you through multiple builds. These RX-7 coilovers arrive tuned for the FC3S 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 | N-06-HM |
| Part Name | HM Series Coilovers |
| Vehicle | 1987-1992 Mazda RX-7 |
| Drivetrain | RWD |
| Chassis Code | FC3S |
| Damping Adjustment | 2-Way (30 levels rebound/30 levels compression) |
| Ride-Height Adjustable | Yes |
| Spring Rate - Front | 9 kg/mm |
| Spring Rate - Rear | 7 kg/mm |
| Spring Size - Front | 62-180-9K |
| Spring Size - Rear | 62-200-7K |
| Swift Springs - Front | 62-178-X |
| Swift Springs - Rear | 62-203-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
- 1987 Mazda RX-7 RWD (FC3S)
- 1988 Mazda RX-7 RWD (FC3S)
- 1989 Mazda RX-7 RWD (FC3S)
- 1990 Mazda RX-7 RWD (FC3S)
- 1991 Mazda RX-7 RWD (FC3S)
- 1992 Mazda RX-7 RWD (FC3S)