Description
Mazda ND MX-5 (15+) BC Racing ER coilover kit 5/2.5 kg/mm
The BC Racing ER coilover kit MX-5 ND (part number N-34-ER) is a coilover kit adjustable in height and damping, also simply called a coilover, for the Mazda MX-5 ND, from model year 2015. The spring rate is 5 kg/mm front and 2.5 kg/mm rear.
The ER series is BC Racing’s coilover kit with external reservoir and 2-way adjustment, developed for serious track and competition use. For the MX-5 ND it is a kit for those building the car for the track.
The monotube dampers have a dual piston, a digressive characteristic and fully synthetic oil with an ultra-high viscosity index. You set compression and rebound in 30 clicks each, independently of each other. The ride height is steplessly adjustable via the damper body and the springs are 5/2.5 kg/mm.
Key benefits
- 2-way damping: 30 clicks compression and 30 clicks rebound, independently of each other.
- External reservoir: monotube with dual piston.
- Digressive characteristic: firm control over the body.
- Fully synthetic oil: with an ultra-high viscosity index.
- Steplessly adjustable ride height: via the damper body.
- Concave lock ring: holds the set height in place.
- Spring rate 5/2.5 kg/mm: the same as the BR and DS kits for the ND.
- Rebuildable: the dampers can be rebuilt.
Suitable for
Mazda MX-5 ND from model year 2015. If it concerns an MX-5 RF and you are in doubt, contact us with your chassis number and we will confirm the fitment.
- Serious track work and club races
- Track days with an ND built for the track
- Tuning compression and rebound for each circuit
Technical specifications
- Manufacturer: BC Racing
- Part number: N-34-ER
- Series: ER, external reservoir for serious track and competition use
- Spring rate front/rear: 5/2.5 kg/mm
- Damper design: monotube with dual piston and external reservoir, digressive, fully synthetic oil with ultra-high viscosity index
- Damping: 2-way, 30 clicks compression and 30 clicks rebound, independently adjustable
- Ride height: steplessly adjustable via the damper body
- Top mounts: camber plates on suitable kits, rubber top mounts optional
- Contents: dampers and springs front and rear, lower mounts, top mounts where applicable, adjustment spanners and warranty card with serial number
- Warranty: 1 year on manufacturing defects; with this track series, noise is not covered by the warranty
Fitting and delivery
This ER kit is vehicle-specific for the ND and replaces the original dampers and springs. We recommend having it fitted by an experienced mechanic and readjusting the wheel alignment afterwards. The delivery time is 1 to 2 weeks as long as the manufacturer has stock. If the kit is temporarily unavailable at BC Racing, you can still order it and we will let you know when it arrives.
The BC Racing ER series uses monotube dampers with a dual piston and an external reservoir, with 30 clicks compression and 30 clicks rebound that are adjustable independently of each other.
Why choose this ER coilover kit MX-5 ND?
With a track ND you want to know what happens when you turn the damping adjusters. Because compression and rebound are adjustable separately on this kit, you can make targeted changes: more support on turn-in or a calmer rebound after a kerb. That keeps setting up the car for each circuit clear and straightforward.
BC Racing coilover kits for the Mazda MX-5 ND
Overview of the BC Racing series for the Mazda MX-5 ND supplied by Race4DriftParts, with the BC Racing part number. Spring rates in kg/mm, front/rear.
| Series | Part number | Springs f/r | Damping | Intended for |
|---|---|---|---|---|
| BR | N-34-BR-RS | 5/2.5 | 30 clicks, linear, rubber top mounts front | Road with the occasional track day |
| DS | N-34-DS-DS | 5/2.5 | 30 clicks, digressive, rubber top mounts front | Track-focused, sporty road use |
| ER (this kit) | N-34-ER | 5/2.5 | 2-way, 30 clicks per direction, external reservoir | Serious track and competition use |
| ZX | N-34-ZX | 5/2.5 | 3-way (20/12/30 clicks), external reservoir | Competition, long sessions, drifting |
Frequently asked questions
Which Mazda MX-5 ND is the BC Racing ER coilover kit intended for?
BC Racing UK lists the ER kit for the Mazda MX-5 ND from model year 2015, and BC Racing’s European title mentions the Roadster. The RF is not listed separately; if you drive an RF and are in doubt, contact us and we will confirm the fitment using your chassis number.
What is the difference between the BC Racing ER and ZX for the Mazda MX-5 ND?
The ER is 2-way adjustable, the ZX 3-way. The ZX splits compression into low speed (20 clicks) and high speed (12 clicks) and is aimed at competition, long sessions and drifting. For serious track use with a clear setup, the ER coilover kit MX-5 ND is a strong choice.
Is the BC Racing ER coilover kit for the MX-5 ND rebuildable?
Yes. The dampers of the ER series can be rebuilt, so you can have the kit rebuilt again after intensive track use.
What is the delivery time of the BC Racing ER coilover kit for the Mazda MX-5 ND?
Normally 1 to 2 weeks, as long as the manufacturer has stock. If BC Racing does not have the kit in stock, you can still order and we will keep you informed.
Delivery outside the European Union: different shipping costs may apply. Don’t worry: we will email you as soon as possible after your order and agree the shipping with you. You are not committed to anything without your consent.
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