Dirt Bike Disc Brake Guards Explained

Dirt bike disc brake guards are an effective way to protect the fragile front and rear disc brake rotors from bending or gathering mud and other debris. The brake discs are relatively expensive to replace, so it makes sense to add disc guards to prevent direct impact damage.

In this post, you will discover:

Next, we will tell you everything you need to know about dirt bike disc brake guards and why you should consider installing them on your dirt bike.

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What Is a Dirt Bike Disc Brake Guard?

A dirt bike disc brake guard, also called a disc brake guard or a rotor guard, is a protective cover that is mounted over the brake disc or rotor at the front and rear of a dirt bike. It protects the brake disc by keeping rocks, sticks, stumps, mud, and other debris from damaging it or becoming tangled in the brake disc. In addition, it prevents the brake disc from getting bent or broken in direct impact or in a crash.

A dusty front wheel of a dirt bike with a disc brake guard

The main task of a disc brake guard is to cover the brake rotor and deflect debris, thus ensuring an even and effective stopping power. If the disc brake guard wouldn’t be keeping mud and small rocks off the disc, caliper, and brake pads, they would also show wear much quicker.

The brake discs on dirt bikes are lightweight and prone to bending—sometimes very easily. If your bike doesn’t have any protection, consider adding a disc brake guard to lower the risk of bending the brake discs.

Did you know that if you have a slightly bent brake rotor, you can easily fix the bent rotor without having to take the wheel off the dirt bike or replacing the brake rotor? Check out our instructions for how to fix a bent brake rotor on a dirt bike with 3 easy steps.

Different Types of Dirt Bike Disc Brake Guards and Covers

There are two types of dirt bike disc brake guards: front disc guards and rear disc guards. As their names suggest, the former protects the front brake rotor and the latter the rear brake rotor.

Depending on your riding style, you can install both disc brake covers on your dirt bike or only the front or the rear one.

Usually, the front disc is more prone to bending. So, if you need to choose only one, we recommend buying the front brake disc guard. The front disc brake guard also provides protection to the lower forks.

When choosing which type of disc brake guard to get, these are the main factors to consider:

  • Design
  • Installation method
  • Color
  • Material

More importantly, you need to reflect these factors based on your riding style and the conditions you ride in.

A front wheel of a dirt bike touching the ground while riding down a sandy hill

Different Dirt Bike Disc Brake Guard Designs

Design-wise some dirt bike disc brake guards provide a better coverage than others.

In addition to the brake disc or the brake rotor, some disc covers may also protect the lower fork and axle connections as well as the brake caliper. If you mostly ride in a terrain with boulders, you may want to opt for a better coverage.

On the other hand, if the front axle nut is covered by the disc brake guard, it can make quick front wheel changes a hassle in racing conditions. So you may want to consider also this aspect if you are attending races in addition to riding on trails.

Dirt bike disc brake guards mount over the brake rotor, so it is understandable that they can affect the air flow and the brake rotor heating. For that reason, most of the disc brake guards are designed with a ventilation that keeps the brake rotor cool in all conditions.

The vented design usually solves the problem and the brakes never really overheat from the guards. It’s usually other aspects that reduce cooling more. For example, if you ride in muddy conditions, actually the vented rotors can be causing issues as those holes hold the mud and wear your brakes out so much faster and that is where a lot of heat comes from.

On the downside, twigs and weeds along with mud with a certain type of consistency can sometimes get trapped in the ventilation holes. Some riders have reported finding it frustrating to have to pull the stuff out after the ride is over. Then again, you still have to wash you dirt bike anyway and having to fix the brake rotors is far more frustrating.

A dusty rear wheel of a dirt bike with a brake disc cover

Dirt Bike Disc Brake Guard Installation Methods

The installation of dirt bike disc brake guards is usually pretty straightforward and a job that you can easily do by yourself. However, there can be some differences in the installation methods between the manufacturers.

Some might require removing the front wheel, whereas other might only include removing the old spacer and replacing it with a new mounting bracket.

The mounting bracket often comes with the disc brake guard but sometimes you need to purchase a mounting kit separately. So make sure to check if it’s included in the one you decide to get.

If you are a racer and need to change tires in racing conditions, a disc brake guard that allows an easy removal of the wheel is probably the best choice for you.

Dirt Bike Disc Brake Guards Offer Multiple Color Options

Dirt bike disc brake guards are not only for protection—they are also for the looks.

Your bike may already have a stock guard installed but the aftermarket ones usually look much cooler. That being said, a disc brake guard is an easy way to add a little extra something to your dirt bike.

Most manufacturers have multiple colors to choose from so that you can color-coordinate the disc brake guard with the color of the fenders or the dirt bike graphics. Only the sky is limit!

Dirt bike rider's right foot standing next to the rear wheel that is protected with a brake disc cover

Disc Brake Guard Material Options

Last but not least, let’s address probably the most important factor: the material used in the disc brake guards.

Dirt bike disc brake guards are usually made of plastic, carbon fiber, or aluminum. The conditions you ride in pretty much determines which material you should go with.

Now, let’s take a closer look at each of these materials next.

Plastic Disc Brake Guards

Plastic dirt bike disc brake guards are one of the most lightweight solutions out there. In addition, they are the least expensive options available.

Disc brake guards made of plastic are a good option especially for the front brake that gets the most hits. They keep the brake rotor cleaner compared to not wearing any. And they help as a deflection more than anything.

However, larger rocks can wipe a plastic cover out due to their light construction. Also, remember to make sure that the plastic is not flimsy and it doesn’t fail you on the first obstacle.

Plastic dirt bike disc brake guards seem to be a short-lived goods among the riders who ride the gnarly terrain. However, it’s better—and cheaper—to destroy a disc brake guard than the brake disc itself.

Acerbis has a great selection of front disc brake guards made of plastic. Their prices range from $30 to $60 depending on whether the mount is included or not. Click here to check the selection and current prices on Amazon.com.

Carbon Fiber Disc Brake Guards

Carbon fiber is very light and super tough material. So it provides a better protection for your brake discs against rocks, obstacles, and other dirt bikes that you may encounter on the trail or on the race track.

Dirt bike disc brake guards made of carbon fiber are durable and also lightweight. They do not bend or get dented as easily as the plastic versions.

The lack of flexibility can sometimes also be a disadvantage and hard objects or a simple drop have reported to break the carbon fiber disc brake guards.

There are many different manufacturers offering carbon fiber disc brake guards for the protection of both the front and rear brake rotors, such as P3 Carbon. The prices range from $100 to $170. Click to check the selection and current prices on Amazon.com.

Aluminum Dirt Bike Disc Brake Guards

Aluminum disc brake guards are more robust, which means they can take harder hits and more beating.

Nowadays, also the aluminum versions are lightweight so the weight shouldn’t be an issue.

There is one downside though compared to plastic and aluminum disc brake guards: the aluminum ones do make more noise. Some riders can find the rattle annoying.

In our opinion, aluminum dirt bike disc brake guards are a great choice especially for enduro and hard enduro riders and racers. They are least likely to bend and if they do, you should be able to bring it back into shape.

Aluminum disc brake guards work great also if you ride in wet conditions with a lot of creek or river crossings or waterfall climbs as they save the forks in the process too.

You will find several reliable manufacturers that offer aluminum disc brake guards, such as Enduro Engineering and Bullet Proof Designs. The prices range from $50 to $150. Click to check the selection and current prices on Amazon.com.

Dirt bike riding over truck tires with the front wheel in the air

When You Should Consider Installing a Disc Brake Guard

There are mainly two factors that affect whether you need disc brake guards on your dirt bike or not.

The first factor is the conditions you ride in and the second factor the type or level of riding you do.

We recommend dirt bike disc brake guards for your dirt bike especially if you

  • ride on a terrain with boulders
  • ride in muddy conditions
  • are a beginner rider
  • practice hard enduro
  • are a hard enduro racer

In general, it is much cheaper to protect the brake rotors than replace them. Dirt bike disc brake guards can also take a beating so you don’t need to worry about replacing them after the first hit. In most cases, you can bend it back and just like that you are ready for the next battle.

Riding Conditions

If you ride in boulders or in muddy or desert conditions, dirt bike disc brake guards make a big difference and any guard is basically better than nothing.

For someone who rides in dirt and rocks, disc brake guards are really nice and handy. They protect the rotor from unnecessary damage not to mention they look pretty cool.

One of the tasks of a disc brake guard is to keep sticks and other debris from getting tangled in the brake rotor. However, if you mostly ride through fields of straw and worry about stuff getting stuck in vents and different places, you can just opt out from getting one.

Riding Style

For a normal trail rider who has been riding for a while, damaging the front disc is not necessarily too common but it does happen.

Then there are riders to whom this seems to be a reoccurring problem that needs to be addressed thanks to their riding style. Not to mention the hard enduro riders that are always looking for more difficult terrain to conquer.

We recommend the dirt bike disc brake guards especially for beginners who are still mostly training and who are more likely to drop their bike in the more technical sections. Usually, the front brake disc is more likely to bend with beginners, so at least consider protecting it.

Also hard enduro racers are most likely to benefit from guarding the brake rotors with dirt bike disc brake guards. In the heat of the race, the last thing you want to worry about is bending or breaking your brake rotors. We recommend plastic guard up front and aluminum one out back.

Whether you go with plastic, carbon fiber, or aluminum disc brake guards, it depends on your personal preference. This in turn depends on where you are located and what conditions you ride in.

A dirt bike rider with full riding gear on riding a dirt bike up a hill

Best Dirt Bike Disc Brake Guards

For beginners, we recommend a less expensive plastic style front disc brake guard and a heavier, more robust design for the protection of the rear brake disc.

Our choice for the front disc guard is the Acerbis X-Brake Vented Front Disc Cover (click to check the current price on Amazon.com). This dirt bike disc brake guard is made of durable polypropylene and it features a carbon fiber like texture. It features an ample venting and provides protection also to the brake caliper. There are several cool color options to choose from. Please note that the installation requires a bike-specific aluminum X-Brake mounting kit that is sold separately.

For the rear front disc guard, we recommend the Enduro Engineering Rear Brake Disc Guard (click to check the current price on Amazon.com). They make high-quality billet aluminum brake disc guards that has a replaceable lower fin. They are made for most popular dirt bike models.

For hard enduro riders and racers, we recommend the front and rear disc brake guards from Bullet Proof Designs that are made in the USA. They are made of lightweight and durable billet aluminum and they are easy to install. There are multiple colors with an anodized finish available to match your bike.

Bullet Proof Designs Front Disc Guard (click to check the current price on Amazon.com) protects also the lower fork lug while still making it possible to adjust the compression or rebound fork through the access hole on the bottom of the guard.

Bullet Proof Designs Rear Disc Guard (click to check the current price on Amazon.com) has a one-piece design that offers added protection. It can be paired with Bullet Proof Design’s rear brake caliper guard.


Dirt bike disc brake guards are an effective way to protect the brake discs as they save the brake rotors from mud, dirt, rocks, roost, and getting bent. They will also last long and save you money when you don’t need to replace the brake rotor itself.

Whether you should get disc brake guards on your dirt bike depends on the type of riding you do and the conditions you ride in.

If you ride in boulders or in muddy conditions and if you are a beginner or hard enduro rider or racer, we recommend that you protect both the front and rear brake discs with dirt bike disc brake guards.

Keep those rotors straight!

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