BC Racing ER series - Ford Focus MK2 (2004-2011) (Inc ST)

BC Racing ER Series Coilovers – Ford Focus MK2 (2004–2011) Including ST

Upgrade the suspension of your Ford Focus Mk2 with the BC Racing ER Series coilover kit, designed for drivers wanting a more advanced setup for fast-road, track day and motorsport use.

Suitable for selected Ford Focus Mk2 models including the Focus ST, the ER Series adds external reservoirs to BC Racing’s monotube damper design, increasing oil capacity and helping improve temperature control during sustained hard use.

With 30-way adjustable damping, independent ride-height adjustment and multiple spring-rate options, the ER Series is a strong choice for more demanding performance builds where consistency and control are priorities.

External Reservoir Damper Design

The defining feature of the BC Racing ER Series is its external reservoir configuration.

By increasing damper oil capacity and helping manage heat more effectively, the ER Series is better suited to repeated high-load driving where damper temperatures can rise significantly.

This makes it particularly useful for track-day, time attack and motorsport applications where consistent damping performance over longer sessions is important.

Key features:

• ER Series monotube damper design

• External reservoirs for increased oil capacity

• Improved temperature control under sustained hard use

• 30-way adjustable damping

• Independent ride-height adjustment

• Adjustable spring preload

• Improved body control and chassis response

• Rebuildable design

• Replacement components available

• Multiple spring-rate configurations available

• Custom specification options available

• Suitable for selected Ford Focus Mk2 models including ST

Spring Rate Options

Available spring-rate configurations include:

9/6kg.mm – recommended spring rate for a balance of comfort and performance

Alternative options include:

• 12/14kg.mm – significantly firmer, track-focused setup

• 10/12kg.mm – firmer performance setup for more demanding circuit use

The recommended 9/6kg.mm configuration provides the most balanced option for fast-road and track use, offering increased chassis support and response while retaining more compliance than the higher-rate alternatives.

The 10/12kg.mm and 12/14kg.mm configurations are aimed at much more focused track and motorsport applications where reduced body movement, increased support and consistency under higher loads are the main priorities.

If you are unsure which spring rate is most suitable for your Focus, please contact us before ordering.

Adjustable Ride Height & Damping

Ride height can be adjusted independently of spring preload, helping retain usable damper travel when lowering the vehicle.

The 30-way damping adjustment allows the suspension response to be fine-tuned according to road conditions, driver preference and intended use, from fast-road driving through to more demanding circuit work.

Vehicle Fitment

Designed for selected:

• Ford Focus Mk2

• Ford Focus ST Mk2 / ST225

• 2004–2011

Exact compatibility can vary depending on model, engine and suspension specification.

Product Image & Specification Note

Product images are for illustration purposes only and may not show the exact specification supplied for every vehicle application.

BC Racing kits can vary depending on vehicle, spring rate, top mount configuration and other specification options. If you have any specific requirements, such as upgraded or alternative top mounts, spring rates, reservoir configuration or ride-height preferences, please contact us before ordering so we can confirm the most suitable setup for your vehicle.

Fast Road, Track & Motorsport Performance

The BC Racing ER Series is particularly well suited to drivers wanting greater consistency and thermal control than a conventional non-reservoir coilover setup.

The recommended 9/6kg.mm spring rate provides a strong balance for fast-road and track use, while the higher-rate options allow the same platform to be configured for significantly more focused circuit and motorsport applications.

Professional Installation Recommended

Professional installation is recommended.

A full four-wheel alignment should also be carried out after installation and once the final ride height has been set to ensure correct geometry, tyre wear and handling characteristics.

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