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CLEARANCE TEIN-FLEX Z Coil-over Kit for 06-15 MX5 Miata

MSRP: $860.00
Price: $731.00
You Save: $129.00 (15 %)
Item Number: TEIN-FLEX-Z-NC
Manufacturer: Tein


Upgrade Front Springs (90-05 Only)
Upgrade Rear Springs (90-05 Only)

CLEARANCE:  We are no longer selling this item.  Once they're gone, they're gone!


The TEIN FLEX-Z Coil-Over Damper kit is perfect for for daily driving and/or occasional weekend racing simply by adjusting the 16 levels of damping force (compression and rebound together).


Full-Length Ride Height Adjustment Feature


Ride Height Adjustment with Little or No Change in Ride Quality

Twin-Tube Structure


For Low Resiliency & Securing Sufficient Stroke

Damping Force Adjustment System


16-level Linear Damping Force Adjustment System

Complete Kit with Upper Mount


Exclusively Designed Upper Mounts are Included (Except Some Models)



Complete Suspension Kit of 4 Shock Absorbers & 4 Springs

1.Incredibly Low Price & Made in Yokohama

FLEX Z inherits all the features and quality of STREET FLEX but the adoption of new platform allows its price to be set at amazingly low range. FLEX Z, of course, maintains the long-favored "Made in Yokohama" quality. Ride height adjustable shock absorber, fully loaded with TEIN's comprehensive technology, is now more affordable prices than ever.

Sealed Structure

Sealed Structure

  • New Approach to Achieve Amazingly Low Prices

After careful consideration, Tein came to the conclusion that they needed to establish new manufacturing system and to develop new product platform, in order to achieve low prices the customers demand. Until now, all TEIN dampers could be disassembled for overhaul; however, they introduce new "Sealed Structure" to FLEX Z. Below is a brief description of this new production process for the FLEX Z at TEIN HQ Factory in Yokohama, Japan.

Flex-Z Production

Top end of shell pipe is drawn, oil & gas are injected then the opening is completely sealed by crimping process. This "Sealed Structure" process also reduces the production time, compared to the production of existing disassembable dampers. 

Flex-Z Seam Welding

In addition, pursuit of efficient production system, such as use of seam welding, allows us to drastically reduce the production cost.

2.Twin-Tube System for Comfortable Ride on Streets

Considering the use of larger tires/wheels and the lowered ride height, FLEX Z uses twin-tube system, in pursuit of ride comfort on streets.

In order to maintain the ride quality on streets with rough spots here and there, a shock absorber has to have sufficient stroke, be low-frictional and move smoothly.

As an oil chamber and a gas chamber are not arranged serially in a twin-tube system, it is easy to secure enough stroke. Also, low gas pressure keeps friction low.

Its smooth stroke movement makes it possible to follow rough and bumpy road surfaces quite well, offering supple ride at low speed and stable ride at high speed.

Flex-Z Twin-Tube Clear Model

3.Full-Length System for Ride Height Adjustment w/ Minimal Change in Ride

Full-length ride height adjustment system, used for FLEX Z, 
enables adjustment of ride height by adjusting the case length,
without changing the damper stroke length and/or spring pre-load.
This has the advantage that the change in ride quality is kept
minimal when the height is adjusted.

This system not only makes it possible to maintain good balance
between the low-down appearance and ride comfort, but also
provides more setting choices for sport driving as well.

Flex-Z Case Length - Long Flex-Z Case Length - Short

Case Length 

Long <=> Short

Flex-Z Ride Height

4.Damping Force Adjustable to Change Ride to Desired Settings

FLEX Z has ever-popular 16-level damping force adjustment (comp./rebound together) feature with the use of needle valve. By turning the adjustment knob, damping force (stiffness) is adjusted linearly step by step, to change the ride and handling of the car to suit driver's needs/preferences. 

Use of well-reputed "ADVANCE Needle" at the needle valve for oil flow control secures sufficient damping force adjustable range. 

Whether it's for the handling characteristics of sport driving or for the ride quality according to numbers of passengers, finding the most desirable setting is easier than ever.

Flex-Z Dial

5.Compatible with EDFC Series to enable In-Car Damping Force Adjustment

With EDFC (Electronic Damping Force Controller) series installed, damping force can be controlled from the cockpit with ease. Stepping motors attached in place of adjustment knobs control the damping force quickly and accurately. 

Use of EDFC turns 16-level adjustment into finer 32-level or 64-level adjustment mode (64-level only available with EDFC ACTIVE / EDFC ACTIVE PRO), to provide the optimum performance by fully utilizing the damping force adjustable range drastically widened by the use of "ADVANCE Needle".

EDFC Active Pro

EDFC Active

EDFC Active Pro

EDFC Active

With EDFC ACTIVE / EDFC ACTIVE PRO, damping force can be controlled automatically according to changes in G-force and/or vehicle speed, to offer very smooth and slick ride like never before. (Some models are NOT compatible with EDFC series.)


Stepping Motor


Stepping Motor

6.Upper Mounts Included for Easy Installation

FLEX Z kit includes upper mounts exclusively designed for each vehicle model; either reinforced rubber mounts or pillow ball mounts.

Reinforced Rubber Upper Mount (For Strut) Pillow Ball Upper Mount (For Strut)

Pillow ball upper mounts for front strut suspensions have camber adjustment feature.

(Some vehicle models use OE mounts.)

Reinforced Rubber
Upper Mount
(For Strut)

Pillow Ball
Upper Mount
(For Strut)

7. Precision engineering and assembly techniques

After many years of research and study, TEIN has developed optimally-shaped dust boot made of most suitable material. Elastic & highly-durable dust boot effectively prevents damages to the piston rod and foreign substances from getting inside the shock absorber. Dust Boot

Dust Boot

Final assembly of shock absorbers is done in the clean room, which is almost equivalent to operating room. Room pressure is kept under control to shut out dust & dirt and all workers entering the room must take air shower, to make sure all the assembly work is done in completely clean air, in order to maintain higher level of accuracy and reliability.

Clean Room

Clean Room

8. Thoroughgoing Rust-Proofing

Upper mounts and lower brackets are coated with rich TEIN green powder paint. This powder paint has high coating film strength, is highly durable yet is low-pollution due to non-use of harmful solvent. After the shot blasting pre-treatment, the patented "2-layer/1-bake" treatment using anti-rust powder paint is applied for superior durability and high corrosion resistance. (Patent No. 4347712)

Flex-Z Paint

Powder Coated Paint

On shell case, TEIN's self-developed one-of-a-kind "ZT Coating" is applied, for tougher protection against chipping, often caused by bounced pebbles, and rust. With zero claim rate, against adhesion, out of 500,000dampers sold, we are confident that people living in snowfall area or near seashores would even be very satisfied.

Flex-Z ZT Coating

ZT Coating

9.Highly Durable & Reliable

For strut suspensions, sufficiently-thick ribbed plate is used for knuckle bracket to maintain high rigidity. Flange shape edge of the bracket provides larger contact area with the bracket lock, which is fastened with the conical washer inserted in between, to effectively prevent loosening of the bracket lock most commonly occurs on front strut suspensions.

Highly-Rigid Knuckle Bracket

Flange Shape Edge and Conical Spring Washer

Brackets for brake hoses and ABS sensor harnesses etc are exclusively designed for each vehicle model for hassle-free installation.

Highly-Rigid Knuckle Bracket

Flange Shape Edge
Conical Spring Washer

Shell case is made of high-strength steel STKM13C and solidly-constructed 
for firm handling and stable ride.

High-Strength Shell Case

High-Strength Shell Case

10.Smooth Ride Height Adjustment & One-of-A-Kind Adjusting Wrench

FLEX Z has adopted the new wrought aluminum spring seats and low-friction hard-resin thrust washers. These effectively reduces the friction with springs, caused during ride height adjustment, and makes it easier to adjust the ride height with pre-load on the springs.

Spring Seat & Low-Friction Thrust Washer

Shell cases are treated with "ZT Coating", a superlow-friction fluorine resin coating, which is tightly baked onto the surface in-house. This special coating provides superior protection against rust and high lubricity, for keeping a smooth adjustment for a long period.

Spring Seat & Low-Friction Thrust Washer

FLEX Z kit includes one-of-a-kind user-friendly ride height adjusting wrench. It has a 12.7mm (1/2in) sq. hole for attaching spinner handle and/or torque wrench for tightening at high torque.

Ride Height Adjusting Wrench

Ride Height Adjusting Wrench

11.No-Sag Springs

Included springs are made of high-tensile steel SAE9254 (tensile strength 200kgf/mm2 or over) and cold formed 

for excellent resistance to sagging and for superior quality stability. Surface is powder coated for superb protection against chipping & peeling, for high durability and for superior anti-corrosion performance. High-quality spring can be used under various conditions without any worry. 

Straight Coil Spring
Barrel-Shaped Coil Spring

The most suitable shape of spring (straight or barrel-shaped) is determined for each vehicle model, to provide wide ride height adjustable range and to secure sufficient stroke without compromising ride comfort.



12.High-Spec Damper Oil

Specially-formulated high-spec oil exhibits stable viscosity characteristics at any temperature; from low to high, to allow shock absorbers to stroke smoothly and to generate damping force stably under various conditions. The oil has superior anti-foaming characteristics hence the bubble cavitation and/or thermal degradation hardly occurs, making it even suitable for tough sport driving. The oil also does not deteriorate much with age, making it possible to maintain and deliver superior performance for the long term.

Damper Oil

Damper Oil

13.Replacement Service to Bring Used Shock Absorbers Back to Life

TEIN makes NO compromise on after-sales service of FLEX Z. Replacement Service is available for FLEX Z, in the place of overhaul/revalving service, as its "Sealed Structure" components cannot be disassembled.

How "Replacement Service" Works

Flex-Z Replacement

No Need to retun the old shock absorber.

Replacement Service allows the customer to purchase and replace the shock absorber body, excluding outer parts (upper mount, lower bracket, spring etc).

For Overhaul/Revalving service, because the shock absorber has to be detached from the vehicle, sent back to TEIN and then returned to the owner once the job is done, there are some disadvantages;

  • Need to prepare loaner (substitute) shock absorber while waiting for overhaul job,

  • Require to do removal/installation twice, and/or

  • Can not use the vehicle left on the lift while waiting for overhaul job.

Replacement Service is time-efficient as the customer can purchase a replacement shock absorber in advance and replace with the old one whenever ready.

Replacement Shock Absorber is Customizable.

You might think that the major advantage of overhaul/revalving service, damping force and/or stroke change, is not available for FLEX Z due to its "Sealed Structure".

Well, TEIN made it possible.

Upon request, we can make the replacement shock absorber to the desired damping force specifications and/or stroke length, to the extent possible. Because the original shock absorber does not have to be returned, you can purchase and stock several replacement shock absorbers in different specifications for various purposes, not just as replacements for worn-out ones.

Such enriched after-sales service is only made available by "Made in Yokohama" quality.

Base Ride Height Drop (inches)

1990-1993  1994-1997 1999-2005 2006-2015
- Front -1.4
- Rear -1.0
- Front -1.4 
- Rear -1.2
- Front -1.6
- Rear -1.4
- Front -1.6
- Rear -1.2
Ride Height Adjustible Range (inches)



1999-2005 2006-2015
MAX Front -2.6 to 1.1
MAX Rear -3.2 to 0.3
MAX Front -2.8 to 0.9
MAX Rear -3.4 to 0.1 
MAX Front -3.0 to 0.5
MAX Rear -3.6 to -0.1 
MAX Front -2.3 to 0.5
MAX Rear -2.6 to -0.9
RECOMENDED Front -1.4 to -0.6  
RECOMENDED Rear -1.4 to -0.6
RECOMENDED Front -1.6 to -0.8  
RECOMENDED Rear -1.6 to -0.8  
RECOMENDED Front -1.8 to -1.0   
RECOMENDED Rear -1.8 to -1.0 

RECOMENDED Front -2.0 to -1.2   
RECOMNDED Rear -1.6 to -0.9

Spring Rates:

1990-2005  2006-2015
- Front 7Kg / 392 lbs/in
- Rear 6Kg / 336 lbs/in
- Front 7Kg / 392 lbs/in
- Rear 5Kg / 280 lbs/in 


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