Description
BC Racing BR coilover kit Mazda MX-5 Miata NA/NB (89-05) 7/5 kg/mm
The BC Racing BR coilover kit MX-5 NA/NB (part number N-04-BR-RS) is a coilover kit adjustable in height and damping, also simply called a coilover, for the Mazda MX-5 NA and NB (Miata), model years 1989 to 2005. The spring rate is 7 kg/mm front and 5 kg/mm rear.
The BR series is the all-round coilover kit from BC Racing, intended for an MX-5 that you simply drive on the road and occasionally take to a track day or autocross. Monotube dampers with a linear piston provide predictable damping, which you adjust in 30 clicks.
An NA or NB on tired original dampers quickly feels wobbly in fast corners. With this kit the little roadster sits more firmly on the road and you choose for yourself how low it sits. You set the ride height via the damper body, independently of the spring preload.
Key benefits
- Ride height independent of spring preload: lower the car via the damper body while the spring keeps the same preload.
- 30-click damping adjustment: you set compression and rebound together, per damper.
- Monotube with linear piston: damping that rises evenly with the speed of the wheel movement.
- Spring rate 7/5 kg/mm: the spring stiffness of the BR kit that BC Racing UK recommends for the MX-5 NA/NB.
- Patented concave lower lock ring: the set height stays firmly locked.
- Rubber top mounts at the front: rubber or the original mounting at the rear.
- Road and track: usable every day and ready for a track day or autocross.
- Rebuildable: the dampers can be rebuilt.
Suitable for
Mazda MX-5 NA and NB (Miata), model years 1989 to 2005: both the first generation (NA) and the second generation (NB)
- Sporty road driving with firmer suspension
- The occasional track day or autocross
- Setting a lower ride height without touching the spring preload
Technical specifications
- Manufacturer: BC Racing
- Part number: N-04-BR-RS
- Series: BR, all-round for road and track
- Spring rate front/rear: 7/5 kg/mm
- Damper design: monotube with linear piston
- Damping: 30 clicks, compression and rebound simultaneously
- Ride height: adjustable via the damper body, independent of the spring preload
- Top mounts: rubber top mounts at the front, rubber or the original mounting at the rear
- 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
Fitting and delivery
The kit is vehicle-specific and replaces the original dampers and springs front and rear. We recommend having it fitted by an experienced mechanic and then having the wheel alignment set, because camber and toe change along with the ride height. The delivery time is 1 to 2 weeks as long as the manufacturer has stock. If BC Racing temporarily has the kit out of stock, you can still order and we will let you know when it comes in.
The BC Racing BR series combines monotube dampers with a linear piston and 30 clicks of damping adjustment with a ride height that is adjustable independently of the spring preload.
Why choose this BR coilover kit MX-5 NA/NB?
The MX-5 NA and NB are light and agile, but the original suspension is tuned mainly for comfort. With this kit the roadster turns in more directly, leans less and you decide the ride height yourself. Because the damping is adjustable in 30 steps, you can set the car up for a relaxed country drive or a day on track.
BC Racing coilover kits for the Mazda MX-5 NA/NB
Overview of the BC Racing series for the Mazda MX-5 NA/NB 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 (this kit) | N-04-BR-RS | 7/5 | 30 clicks, linear, rubber top mounts front | Road with the occasional track day |
| DS | N-04-DS-DS | 7/5 | 30 clicks, digressive, rubber top mounts front | Track-focused, sporty road use |
| ER | N-04-ER | 8/6 | 2-way, 30 clicks per direction, external reservoir | Serious track and competition use |
| ZX | N-04-ZX | 10/8 | 3-way (20/12/30 clicks), external reservoir | Competition, long sessions, drifting |
| ZX | N-04-ZX | 7/5 | 3-way (20/12/30 clicks), external reservoir | Competition, long sessions, drifting |
Frequently asked questions
Does the BC Racing BR coilover kit fit both the Mazda MX-5 NA and the NB?
Yes. BC Racing releases this kit for the MX-5 NA and NB (Miata) from 1989 to 2005, so for both generations. If you are unsure about your car, just send us the chassis number and we will check it for you.
What is the difference between the BC Racing BR and DS for the Mazda MX-5 NA/NB?
The BR has a linear piston and is intended for the road with the occasional track day; the DS has a digressive piston with firmer damping at low piston speeds and is more track-focused. For the NA/NB, both kits have 7/5 kg/mm and rubber top mounts at the front. If you mainly drive on the road, the BR coilover kit MX-5 NA/NB is the logical choice.
Can I set the ride height on the BC Racing BR coilover kit for the MX-5 NA/NB without compressing the springs?
Yes. On the BR series you adjust the ride height via the damper body, independently of the spring preload. This way you lower the car while the spring keeps its preload.
What is the delivery time of the BC Racing BR coilover kit for the Mazda MX-5 NA/NB?
The delivery time is normally 1 to 2 weeks as long as the manufacturer has stock. If the kit is temporarily sold out at BC Racing, you can still order and we will keep you informed of the delivery date.
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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