BC Racing RM Series - BMW 3 Series E46 M3 (2000-2006) (True Rear Coilover)
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PLEASE NOTE THE IMAGE IS FOR ILLUSTRATION PURPOSES ONLY IF YOU REQUIRE SPECIFIC NEEDS SUCH AS TOP MOUNTS THEN PLEASE CONTACT US TO CONFIRM BEFORE ORDERING
BC Racing RM Series True Rear Coilovers – BMW E46 M3
The BC Racing RM Series True Rear Coilovers for the BMW E46 M3 are a high-performance suspension upgrade designed for drivers looking for increased rigidity, reduced unsprung mass and a true rear coilover conversion for demanding fast-road and track use.
The RM Series uses an inverted monotube damper design, helping increase structural rigidity while reducing the mass of moving suspension components. Combined with 30-way damping adjustment and the True Rear layout, the RM Series provides a focused suspension platform for serious E46 M3 builds.
Why choose BC Racing RM Series True Rear for your E46 M3?
The BMW E46 M3 is an excellent platform for fast-road and track driving, and the RM Series is aimed at owners looking for a more specialised setup than the BR or DS Series.
The inverted damper design helps improve rigidity and suspension response during rapid direction changes and high-load cornering, while the True Rear configuration converts the factory-style divorced rear spring and damper layout into a complete rear coilover assembly.
This combination makes the RM Series True Rear particularly well suited to E46 M3s used regularly on track or developed around a more motorsport-focused chassis setup.
Key Features
- BC Racing RM Series True Rear coilovers
- BMW E46 M3 application
- True rear coilover conversion
- Rear spring mounted around the damper
- Inverted monotube damper design
- 30-way damping adjustment
- Adjustable ride height
- Increased structural rigidity
- Reduced unsprung mass
- Rebuildable damper design
- Application-specific spring rates
- Custom spring-rate options available
- Adjustable top mounts where applicable
- Designed for demanding fast-road and track use
True Rear Coilover Conversion
The main difference between this kit and the standard BC Racing E46 M3 RM Series setup is the rear suspension configuration.
The standard E46 rear suspension uses a divorced layout, with the rear spring and damper mounted separately.
With the True Rear configuration, the spring is mounted concentrically around the rear damper, creating a complete rear coilover assembly.
This provides a more conventional motorsport-style rear suspension layout and can make spring changes and setup development more straightforward on track-focused cars.
Inverted Damper Technology
The defining feature of the RM Series is its inverted monotube damper design.
Unlike a conventional damper, the inverted layout places more of the damper assembly towards the chassis. This can reduce unsprung mass while increasing rigidity within the suspension assembly.
The design is particularly useful during demanding driving, where higher lateral loads and repeated suspension movement place greater stress on the dampers.
For track-focused E46 M3 builds, this makes the RM Series a strong option for drivers looking for a more specialised suspension setup.
BMW E46 M3 Track Suspension
The RM Series True Rear kit gives E46 M3 owners a highly adjustable platform for developing the car's handling performance.
The inverted damper design helps increase rigidity and reduce unsprung mass, while the True Rear layout provides a more dedicated coilover configuration at the rear.
The kit can work alongside other chassis upgrades such as:
- Performance tyres
- Adjustable suspension arms
- Uprated anti-roll bars
- Polyurethane or solid bushes
- Chassis reinforcement
- More aggressive alignment settings
For cars that regularly see track use, the RM Series True Rear provides greater scope to develop the suspension around spring rates, corner weights, tyre choice and geometry.
30-Way Damping Adjustment
The RM Series provides 30 levels of damping adjustment, allowing you to tailor the suspension response to suit different driving conditions.
Softer settings can provide greater compliance for road use, while firmer settings can increase chassis control for spirited driving and track use.
This also allows the suspension to be refined as tyres, alignment or other chassis modifications change.
RM Series Maintenance
The increased performance of the RM Series does come with additional maintenance compared with more conventional coilover designs.
The inverted damper assembly should be kept clean and inspected regularly, particularly on cars exposed to road grime, water and frequent track use.
Relevant moving and mating surfaces should also be maintained in line with BC Racing's recommendations to help reduce unwanted noise or wear.
If your E46 M3 is primarily used on the road and low maintenance is a priority, the BR or DS Series may be a more suitable option.
Choosing Your Spring Rate
Spring-rate selection is particularly important with a True Rear E46 M3 setup.
Because the rear spring acts at a different point in the suspension compared with the factory divorced arrangement, spring rates used with a conventional E46 rear setup should not be directly transferred to a True Rear configuration.
The correct spring rate should instead be selected specifically for the True Rear layout, taking into account:
- Vehicle weight
- Tyre compound and width
- Road or track use
- Alignment
- Anti-roll bars
- Chassis modifications
- Driver preference
If you're unsure which spring-rate configuration is appropriate for your E46 M3, contact us before ordering and we can help you choose a suitable setup.
Important True Rear Considerations
A True Rear coilover places the rear spring load through the damper mounting location rather than the original factory spring location.
Because this changes how suspension loads are transferred into the chassis, the condition and suitability of the relevant mounting points should be considered before installation.
This is especially important on track-focused E46 M3s, where the chassis may experience considerably higher loads than during normal road use.
Professional installation and regular inspection of the rear damper mounting points and surrounding chassis are recommended.
E46 M3 Compatibility
This BC Racing RM Series True Rear kit is designed for the BMW E46 M3 application.
As E46 models can vary depending on year, market and existing suspension configuration, please confirm your exact vehicle specification before ordering.
If you're unsure whether this is the correct True Rear application for your M3, contact us and we'll help you identify the appropriate setup.
What's Included?
The BC Racing RM Series True Rear kit is supplied as a complete coilover suspension package for the applicable BMW E46 M3, including the front coilovers, True Rear rear coilover assemblies, springs and relevant adjustable components.
Exact top-mount and spring-rate specifications can vary depending on the selected configuration, so please check your chosen setup before ordering.
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