Do You Need a Motorcycle Steering Damper? A Comprehensive Guide to Pros, Cons, and Installation

What is a Motorcycle Steering Damper?

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A motorcycle steering damper is an item primarily installed on motorcycles used for sport riding, such as on racetracks.

Steering dampers are found on racing machines like MotoGP bikes and are often standard equipment on sport-oriented motorcycles. So, what exactly is their role?

How Motorcycle Steering Dampers Work and Their Role

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We will explain the mechanism and role of motorcycle steering dampers in more detail.

If you are into sport riding, such as on racetracks, or if you want to reduce steering wobble, please refer to this information.

Mechanism

Since around the year 2000, linear-type steering dampers mounted along the top bridge of the handlebars have become mainstream.

The piston inside the oil-filled cylinder dampens forces applied to the steering due to impacts, counteracting the input force.

In recent years, rotary-type steering dampers have also emerged. These operate in conjunction with the rotation of the steering, but unlike linear types, they require less travel (range of motion), so they offer smoother operation.

Role: Preventing the bike from becoming unstable during riding

Steering dampers absorb shocks to the steering caused by bumps and other irregularities, allowing the motorcycle to run stably.

Motorcycles are designed so that the steering naturally turns with the movement of the body, but unexpected steering wobbles can occur, for example, when hitting a bump. If the wobble is significant, it can even throw the rider off.

The role of a steering damper is to suppress such sudden steering wobbles.

Essential for racing and track riding

On a racetrack, where bikes are constantly ridden at full power, the steering can wobble significantly when the rear tire slips or when going over a bump.

If the wobble is severe, riders can easily be thrown off. Additionally, constantly fighting the wobble can affect lap times and make it difficult to concentrate on battling rivals.

Steering dampers prevent or control the extent of such large steering movements, making them essential items for racing vehicles where speed is paramount.

Advantages of Steering Dampers

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Installing a steering damper on a motorcycle offers various benefits that enhance riding stability.

The main benefits of a steering damper are as follows:

Prevents steering oscillation (shimmy phenomenon)
Stabilizes handling
Suppresses kickback

Advantage 1: Prevents steering oscillation (shimmy phenomenon)

A benefit of steering dampers is that they suppress the "shimmy phenomenon" that can occur during riding, reducing vibrations.

The shimmy phenomenon is a situation where the handlebars shake rapidly from side to side. There are two main types: low-speed shimmy, which occurs at low speeds (below about 40-60 km/h), and high-speed shimmy, which occurs at high speeds (around 100-120 km/h).

The shimmy phenomenon is often caused by conditions where the tires are not rotating normally, such as incorrect tire pressure or warped wheels.

Installing a steering damper helps to suppress the shimmy phenomenon, which is one of its benefits.

Advantage 2: Stabilizes handling

Another advantage of a steering damper is that it stabilizes handling by preventing the handlebars from moving excessively from side to side on roads where they might otherwise be jostled.

Furthermore, even in situations where the handlebars are suddenly wrenched by bumps or other road irregularities, a steering damper prevents significant handlebar movement.

The benefit of installing a steering damper is that it stabilizes handling and helps maintain the bike's posture.

Advantage 3: Suppresses kickback

One of the benefits of a steering damper is its ability to suppress kickback, which is when the handlebars violently twitch in an unintended direction.

Kickback is a reaction that occurs when there's a discrepancy between the current contact patch and the natural, ideal contact patch, and the motorcycle attempts to correct itself to its natural position.

Kickback can cause the handlebars to twitch significantly, destabilizing the motorcycle. However, with a steering damper installed, kickback is mitigated, and the vehicle's stability is maintained.

Disadvantages of Steering Dampers

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Installing a steering damper has several disadvantages.

The main disadvantages of a steering damper are as follows:

Heavier handling
More difficult to maneuver the motorcycle
Risk of falling
Requires regular maintenance

Disadvantage 1: Heavier handling

One disadvantage of installing a steering damper is that the handlebars become heavier compared to riding without one, making it harder to turn the handlebars quickly.

Although a steering damper suppresses handlebar wobble, it restricts movement, resulting in heavier handling.

Disadvantage 2: Difficult to maneuver the motorcycle

Because the steering damper makes it harder to freely turn the handlebars left and right, the motorcycle becomes more difficult to maneuver.

The heavier steering makes it harder to turn, especially when pushing the bike off, such as when parking.

A disadvantage of installing a steering damper is that it reduces the steering angle and makes the bike more difficult to maneuver in situations that require large steering inputs, such as when parking or making a U-turn.

Disadvantage 3: Risk of falling

Installing a steering damper reduces the steering angle, which has the disadvantage of making it easier to fall when making large steering inputs, such as during a U-turn or when pulling the bike out of a parking space.

Additionally, while motorcycles naturally self-steer when turning, a steering damper weakens this self-steering effect, which can also make it easier to fall.

A disadvantage of installing a steering damper is that it makes the bike more prone to falling compared to riding without one, especially when entering curves or maneuvering.

Disadvantage 4: Requires regular maintenance

To ensure the steering damper performs optimally, regular maintenance and replacement are necessary, which is a disadvantage as it increases the burden compared to not having one.

According to Active, the manufacturer of steering dampers, the recommended period for steering damper replacement or maintenance is every 2 years or every 20,000 km of travel.

The need for replacement or overhaul every 2 years or 20,000 km means increased financial burden, which is a disadvantage.

Steering Damper Overhaul Cost

The estimated cost for a steering damper overhaul is around 12,000 to 15,000 yen.

An overhaul includes oil changes and the cost of parts that wear out with use.

Furthermore, to ensure the motorcycle's running stability and the steering damper's performance, it is advisable to overhaul the suspension every 12,000 to 20,000 km.

Suspension cost estimates

Front fork: 35,000 to 40,000 yen
Rear shock (mono): around 20,000 yen, (dual): around 30,000 yen

How to Install a Motorcycle Steering Damper

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We will explain how to install a steering damper step by step.

If you are planning to install a steering damper yourself or are considering purchasing one, please refer to the next section, "How much does it cost to replace a motorcycle steering damper?".

Step 1: Removing the fairing and tank

First, remove the fairing, fuel tank, and other necessary parts.

The fairing is secured with screws and clips, so remove it carefully to avoid breaking the clips by applying too much force.

When removing the fuel tank, turn the fuel cock to OFF. Work should be done away from open flames to prevent fire.

Step 2: Installing the steering damper

Referring to the installation instructions included with the steering damper, provisionally attach the steering damper to the motorcycle (without fully tightening the screws).

The steering damper will be disassembled in its box, so assemble it first before beginning the provisional attachment process.

Step 3: Operation check and final tightening

Once the steering damper is provisionally attached, move the motorcycle handlebars left and right to check if it's operating normally and if the axis is aligned.

If there are no issues, tighten the provisional screws to complete the steering damper installation.

Reattach the fairings, fuel tank, etc., that were removed prior to installation. As a precaution, ride at low speeds to observe the steering damper's operational characteristics and adjust the damping force to your preference or riding conditions.

How much does it cost to replace a motorcycle steering damper?

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We will explain the costs involved when having a motorcycle steering damper installed by a shop versus replacing or installing it yourself.

If you request a shop to do it

If you request to replace a stock steering damper with an aftermarket one on a motorcycle that originally comes with a steering damper, the average cost ranges from approximately 13,000 to 20,000 yen for a faired bike, and 8,000 to 15,000 yen for a naked bike.

If you request installation on a motorcycle that does not have a steering damper, the average cost will be around 11,000 to 18,000 yen for a faired bike and 6,000 to 12,000 yen for a naked bike.

If you install (replace) it yourself

If you have the necessary tools to install a steering damper, there are no installation fees.

However, depending on the steering damper or motorcycle, a separate clamp may be required, in which case the cost of the clamp will be necessary.

Is a Motorcycle Steering Damper Necessary?

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Whether a steering damper is necessary depends on the motorcycle's style and riding scenarios.

For daily commuting and city riding

If you primarily use your motorcycle for commuting or city riding, a steering damper is generally not necessary.

While installing a steering damper offers benefits such as reduced handlebar wobble, it also has the disadvantage of making quick turns more difficult, and for city riding, the disadvantages tend to outweigh the benefits.

However, if you frequently experience the shimmy phenomenon (fine left-right handlebar shaking), installing a damper can suppress or alleviate the symptoms, so we recommend considering it.

For sport riding such as on racetracks

If you engage in sport riding, such as on racetracks, installing a steering damper is highly recommended.

They are installed on MotoGP machines and are standard on some sport bikes. The stabilizing effect of a steering damper is particularly significant when riding at high speeds on a racetrack.

When going on a touring trip

Generally, a steering damper is not particularly necessary for touring. However, if the handlebars tend to be easily pulled left and right or if the shimmy phenomenon occurs frequently during riding, it might be worth considering installation.

When parking, pulling the bike out of a parking space, or making U-turns, situations that require large steering inputs, a steering damper can make quick turns difficult.

For touring, which often involves making large steering inputs, a steering damper reduces maneuverability, so the disadvantages outweigh the benefits.

Recommended Motorcycle Steering Dampers

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Here are two recommended motorcycle steering dampers.

If you are considering installing a steering damper, please refer to this information.

HYPER PRO Steering Damper Unit RSC Type

Source: https://bikeman.jp/products/ac-22202075

The HYPER PRO (Hyperpro) Steering Damper RSC type is a revolutionary steering damper.

The RSC (Reactive Safety Control) type is designed so that damping force is not generated during normal handlebar operation, allowing the motorcycle's self-steer to remain natural. It only activates when assistance is needed.

It has a stroke length of 75mm and requires a separate vehicle-specific stay for installation.

Manufacturer: HYPER PRO
Product name: Steering Damper RSC Type Dark
Part number: 22202075
Stroke length: 75mm
Intended use: Sport riding, circuit riding
Price (tax included): 37,979 yen

KN KIKAKU Universal Steering Damper Gold

Source: https://bikeman.jp/products/kn-kn-sd01-gd

For those looking for an affordable steering damper, the KN KIKAKU (KN Planning) "Universal Steering Damper" is recommended.

It has a stroke length of 75mm, 22 levels of adjustment, and is universal, meaning it can be installed on a variety of vehicle models.

In addition to the gold shown in the image, it is available in a total of four colors: "Black," "Blue," and "Red."

Manufacturer: KN KIKAKU (KN Planning)
Product name: Universal Steering Damper
Stroke length: 75mm
Price (tax included): 10,134 yen

Summary

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We have explained the mechanism, advantages, and disadvantages of motorcycle steering dampers.

While installing a steering damper increases riding stability, it also makes maneuvering more difficult, which can be challenging when making U-turns or parking.

For city riding only, the disadvantages of installation outweigh the advantages. However, for sport riding on racetracks, it is a powerful item that enhances riding stability.