Product Details
BC Racing HM Series Coilovers for the 2012-2015 BMW 3 Series (F30, F34) 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 3 Series (3-Bolt Top Mounts) chassis and refined until it balances ride quality with performance — the reason 3 Series (3-Bolt Top Mounts) 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.
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 3 Series (3-Bolt Top Mounts) coilovers arrive tuned for the 3 Series (3-Bolt Top Mounts) 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-29-HM |
| Part Name | HM Series Coilovers |
| Vehicle | 2012-2015 BMW 3 Series (3-Bolt Top Mounts) |
| Drivetrain | RWD |
| Chassis Code | F30, F34 |
| Damping Adjustment | 2-Way (30 levels rebound / 30 levels compression) |
| Ride-Height Adjustable | Yes |
| Spring Rate - Front | 5.5 kg/mm |
| Spring Rate - Rear | 9 kg/mm |
| Spring Size - Front | 62-180-5.5K |
| Spring Size - Rear | 62-220-9K |
| 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 |
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Vehicle Fitment
- 2012 BMW 3 Series (3-Bolt Top Mounts) RWD (F30, F34)
- 2013 BMW 3 Series (3-Bolt Top Mounts) RWD (F30, F34)
- 2014 BMW 3 Series (3-Bolt Top Mounts) RWD (F30, F34)
- 2015 BMW 3 Series (3-Bolt Top Mounts) RWD (F30, F34)