Maruha motors

BC Street suspension kit

BC Street suspension kit
BC StreetNB upper Mount
BCストリート NBアッパー ストロークアップ仕様 減衰量調整ノブ付(2017/7〜)
code:mar08080800 For 全車
¥154,000(¥140,000)

Among the Miata/MX-5 suspension kits on the market there are only a few for streets. The reason for this might be that if one doesn’t run on circuits, one doesn’t need car height adjustment etc.
In the case of the BC damper the spring’s specs are F8kg and R6kg and it can be used as well on streets as on circuits.

Among the Miata/MX-5 suspension kits on the market there are only a few for streets. The reason for this might be that if one doesn’t run on circuits, one doesn’t need car height adjustment etc.
In the case of the BC damper the spring’s specs are F8kg and R6kg and it can be used as well on streets as on circuits.

BC Street characteristics:

1. The car’s height has been slightly lowered
2. The height adjustment can be carried out using a special tool
3. The whole height can be adjusted, which secures the stroke amount
4. Better grip
5. Damping force wide adjustment range
6. Possibility of O/H
7. Reasonable price

1.The spring’s setting

The spring’s setting
The spring’s setting

In our thinking, suspension for streets starts with the spring.
According to this the rate is F 6kg and R 4kg.

The spring’s setting
The spring’s setting

2.Vehicle height adjustment

Vehicle height adjustment

Thanks to the coilover the vehicle’s height can be easily adjusted.

Vehicle height adjustment

We can adjust the vehicle height using the belonging wrench.

3.Whole height adjustment

Whole height adjustment
Whole height adjustment

The suspension’s lower part ends in the so called bottom bracket.
The height adjustment can be carried out by not only adjusting the spring’s lower seat, but by using the bottom bracket too.

4.Upper mount for NB

Upper mount for NB
Upper mount for NB

NB type upper mount is adopted to suppress the feeling of protruding.
The parts used in the original are made very well on the premise of sound countermeasures and life.
By adopting these parts, it is possible to meet the optimal function as a street specification.

Upper mount for NB
Upper mount for NB

In addition, the lower part of the upper seat is equipped with a dedicated aluminum upper seat with aluminum shavings to improve the adhesion and fixing of the spring.

Aluminum upper sheet for BC
Aluminum upper sheet for BC
Aluminum upper sheet for BC
BC用アルミアッパーシート
code:mar12112700
¥4,400(¥4,000)

5.Specially designed upper mount (high stroke specification)

Specially designed upper mount (high stroke specification)

The crying place of roadster NA.NB is a stroke shortage of the rear side sass.
Due to the structure of genuine sass, there is a aspect that it is difficult to secure a stroke.
The more specialized the circuit specifications are, the harder the spring is mounted than is used on the street, and as a result, the stroke volume is smaller. However, the closer this is to everyday specifications using a supple and soft spring, the more roll volume becomes more embossed. The biggest problem is the total length.
It is good if you can use a long suspension like the front on the rear side, but the distance from the chassis mounting part to the lower arm mounting part is fixed, so the upper mount review will be effective to overturn this.

The new upper mount adopted from July 2017 is a complete Maruha specification that was launched from a dedicated type to increase this by 20 mm as a base model of genuine products for NB. For details, please refer to Upper Seat High Stroke 20 mmUP for BC Suspend.

Upper sheet 20mmUPSuspension
Upper sheet 20mmUPSuspension
BCサス用 アッパーシート (2022年9月〜) ハイストローク 20UP NC10-28-340C
code:mar17060910 For NB全車
¥4,180(¥3,800)

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Upper sheet suspensionMaruha set part
Upper sheetSuspension
アッパーシート  サスペンション
code:NC10-28-340C For NB全車
¥2,316(¥2,105)

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Along with this, the case length and rod length have also been reexamined.

6.15-stage attenuation adjustment

15-stage attenuation adjustment
15-stage attenuation adjustment

The newly added knobs made of dedicated aluminum billet are designed for rolletting for easy damping adjustment.
The wide range of 15-stage click attenuation adjustments is a Marha-stick setting that is set to meet many needs.
The damping force considering matching with relatively soft springs makes radial tires grip on the road surface reliably even in bad weather, conveys moderate roll volume and controllability to the driver, and you can enjoy the characteristic of a full-fledged suspension kit while street specifications.

7.Spring seatt

Spring seatt
Spring seatt
Spring seatt

An upper seat made of special aluminum billet is adopted between the upper mount and the spring.
This is to ensure that the spring is always stable and seated on the upper mount.
This does not cause any spring outs.
In addition, a dedicated seat ring is provided between the spring and the aluminum upper seat to reduce friction damage caused by spring bites and vibrations.

8.Substance

Substance

Compared to conventional BC dampers, the case diameter is a little thinner.
As a result, the amount of oil is small, and hard driving comes out.

Substance

Although this is a big difference from bc damper, BC Street boasts enough performance to cope with sports driving on public roads and passes.
In addition, the shaft uses a shaft equivalent to the BC damper to increase the strength.
The main body is plated and rust-proof.

9.Completely made to order

Completely made to order

BC Street, like BC dampers, is a bespoke marha special manufactured in a specialized factory.
The production lead time is indeed 2-3 months.
We are working to secure safety stock so as not to interfere with supply, but sometimes it may be out of stock, so please check your inventory in advance.

10.Customer service

Malha BC Street, of course, can be overhauled. It can be used for a long time and maintains performance in an overhaul. This is a reassuring factor for users who value suspension. Even at an affordable price, it is also Maruha's commitment to enhance after-sales service and obtain performance and trust from as many users as possible.

11.Shock absorber body replacement

Shock absorber body replacement

By replacing the absorber body with a new one, you can always keep the latest performance. Please see the bc sus series / shock absorber body single item page.s

Susvolt Set

Susvolt Set

In the na/NB year, there are too many rusty bolts. It is difficult to determine whether it needs to be reusable or replaced. So how about replacing all the bolts and nuts with new and refreshing them? Susvolt set with bolts/nuts around the arm Stabilizer genuine set that summarizes stabilizer end rod and its bolts and nuts Please see this page. Please take this opportunity to use it.


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マルハオリジナル サスペンション♪BCストリート ストロークアップ仕様
BC StreetNB upper Mount

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