2011-2020 Toyota Sienna Tein RX1 Coilovers
2011-2020 Toyota Sienna Tein RX1 Coilovers 2011-2020 Toyota Sienna Tein RX1 Coilovers
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5” drop front

3” drop rear



Hydraulic Bump Stopper (H.B.S.)

The solution:

Hydraulic Bump Stopper (H.B.S.)!

Standard Shock Absorbers with Bump Rubber

Upward jolting and repeated bouncing, driving over a bump. It takes a while to stabilize.

The impact is absorbed; no bouncing and rapid stabilization.

Even in a fully seated and loaded minivan,

jolts from the rough road are reduced.

Ride comfort can be enjoyed in all seats!

* About Bump Rubber

Made from urethane or rubber, it buffers the impact at full compression, preventing damage to the vehicle body or shock absorbers.

How the H.B.S. Mechanism Works

Shock Absorbers with H.B.S./Shock Absorbers with H.B.S.

In regular shock absorbers, bump rubber is vital to avoid damage from bottoming out. Unfortunately it causes instability, because when a large impact compresses it, energy thus amassed is released upwards.

RX1 however uses the Hydraulic Bump Stopper to convert the impact to thermal energy and absorb it. This strongly reduces the shock, and there's no repulsion force.

H.B.S.: A Must for World-Class Rallies!

Rally Scene

Swiftly absorbing the impact of big jumps, H.B.S. produces a much more stable vehicle.

The Hydraulic Bump Stopper (H.B.S.) Mechanism

Inactive H.B.S./H.B.S. Activated

In shock absorbers with inactive or no H.B.S., the operative valve (green) floats, and oil flows freely through the base valve ports. Resistance to the flow from the shim stack then, causes damping force.

Near full compression, when the piston rod strokes beyond a predetermined point, the operative valve is pushed down and activates H.B.S.: the base valve ports are narrowed, blocking the oil flow. This results in high damping force.

A relief valve serves to suppress sudden damping force increase, when the pressure in the cylinder exceeds its regular level.

The setup of the H.B.S. mechanism is optimized per vehicle model, with the right activation point and damping force.

To avoid damages/breakages, conventional bump rubbers must also be fitted/used with H.B.S.-equipped dampers.

Full-Length Adjustable

Lower brackets on strut type suspensions come with camber angle adjustment feature. Camber angle can be adjusted by rotating the eccentric washer 180°. This feature can enable camber angle adjustment, even if it can not be adjusted with the upper mounts.

*Except some models (e.g. strut with inset type brackets)

Full-Length Adjustable

Advantage: adjusting ride height has little effect on ride quality.

Same stroke length Changed full length

In addition to combining a low down style with ride comfort, this system offers more setup options for sport driving too.


Compared to the regular mono-tube system, twin-tube attains longer strokes with a smaller repulsive force, resulting in high ride comfort.

Mono-Tube / Twin-Tube

Roads may have all sorts of surface conditions. This calls for shock absorbers with ample stroke, that operate smoothly.

Thanks to flexible strokes, you can negotiate gaps and bumps steadily on rough roads, meaning a smooth ride at low speed and stability at high speed.

Damping Force Adjustment

RX1 features 16-level damping force adjustment, for simultaneous adjustment of compression and rebound.
Modify ride comfort and handling according to your preference, changing the properties of the shock absorber with the adjustment dial.

Adjustment Dial

Adjust to Suit Driving Conditions

The above are examples; actual settings vary according to the vehicle's circumstances.

Mounts Included

An easy-to-install mount, exclusively designed for each vehicle model, is included in the product kit.

Reinforced rubber upper mount
Reinforced Rubber Upper Mount
(for Strut)
Pillow ball upper mount
Pillow Ball Upper Mount
(for Strut)

We have devised a suitable mount for each vehicle type.
Pillow ball upper mounts for front strut suspensions feature camber adjustment.*

* Camber Angle Adjustment:

This means changing the contact patch of the tires during cornering, by changing the angle at which the tires touch the ground.

Example of Adjustment Negative camber:

Replacement Service

For this product we offer not overhaul, but a replacement service.

When your shock absorber wears out...Purchase only a new shock absorber. As good as new!

Our replacement service revives your shock absorber, by replacing the main part. It allows you to buy the shock absorber itself without the exterior parts like the upper mount, lower bracket, spring, etc.

Overhaul Issues / Replacement Service

Revalving is also available!

Damping Force Modification

This entails changing damping force to suit your driving conditions or preferences, by re-arranging the shock absorbers' internal components.

Stroke Modification

This entails changing the stroking distance to suit your driving conditions or preferences, by e.g. replacing or modifying the shock absorbers' internal components.

>> Click for More Details

EDFC Compatible

The EDFC Series offer easy damping force adjustment from the driver's seat.*
* Some vehicle models are not compatible

A motor instead of adjustment dial

A motor instead of adjustment dial

Remote adjustment from the cockpit!

EDFC Series Lineup



Automatic & Flexible Adjustment with New
Jerk-Reactive Control
for Enhanced Driving Experience

Individual Wheel Control Jerk-Reactive Adjustment

Cornering-Reactive Accel/Deceleration-Reactive

Speed-Reactive Wireless Control

AI (Learning Function)



The Finest in Electronic Damping Force Controllers

Individual Wheel Control Cornering-Reactive

Accel/Deceleration-Reactive Speed-Reactive

Wireless Control

High Durability and Reliability

Optimal Dust Boot

Dust Boot

Thanks to its smooth compression and high durability, the dust boot guards the piston rod from damage, and keeps foreign material out of the shock absorber.
(Some vehicles use their OE dust boots)

No-Sag Spring


Cold formed with SAE9254 steel (minimum tensile strength 200 kgf/mm2), our springs are outstandingly sag-proof and boast extremely stable quality.

Superior rust protection is ensured with a highly durable powder coating that does not peel or flake. Our high-quality springs can be used without worries, in any conditions.

High-Performance Damper Oil

Damper Oil

Since TEIN's damper oil maintains a stable viscosity in a broad temperature range, it sustains smooth strokes and reliable damping force in a variety of circumstances.

Due to excellent anti-foaming properties, it's resistant to cavitation (bubble forming). Since it's strong against heat too, it's suitable for fierce sport driving as well.

Furthermore, the damper oil keeps up its superior performance long-term, because it's resistant to deterioration over time.


TEIN-Green Powder Coating

Powder Coating

A bright TEIN-green powder paint is used on elements such as the upper mount and lower bracket. Our powder coating technique produces an extremely strong and durable film. No harmful organic solvents are used, for minimal pollution.

Superior durability and corrosion resistance are achieved by TEIN's patented 2-Layer, 1-Bake powder coating method, which uses 2 layers of anti-rust paint on a blasted surface.
(Japanese patent number 4347712)

Special Surface Treatment 'ZT Coating'

ZT Coating

Our unique special surface treatment ZT Coating makes the paint strong against chipping by flying gravel, and further enhances its corrosion resistance.

With zero claims for stuck parts due to rust in 500,000 shock absorbers, TEIN shock absorbers are amazingly rustproof. We're confident of customer satisfaction even in coastal areas or regions with heavy snowfall.