Going fast on a dirt bike is a blast but you are here because you are wondering how fast a 50cc sized dirt bike can go?

Most 50cc dirt bike models are for kids and can go as fast as 24 to 40 miles per hour. 50cc motocross dirt bikes can reach speeds up to 45mph. If you want your kid to go even quicker, you can invest in aftermarket parts. However, higher speeds are not recommended for off-roading as you can lose control. 

The speed of a 50cc dirt bike depends on a few different variables. However, sometimes going fast on a dirt bike might not be an option.

Things that effect the speed of a 50cc dirt bike

  • Transmission Type
  • Weight
  • Motor type
  • Gearing

For example a Honda CRF50 has a different transmission, motor, and gearing that a KTM 50 SX. Both these 50cc dirt bikes fit within the “50cc” engine size but are totally different dirt bikes.

Basically within the 50cc dirt bike world you have 2 types of dirt bikes

  • 50cc Trail dirt bikes
  • 50cc Motocross dirt bikes

Its important to note this as each has its own top speed.

Dirtbike Sam

50 CC dirt bike gearing has an effect on overall top speed

Smaller Sprocket = Higher top speed

Gearing is also a MAJOR factor when it comes to over all top speed. You can put a smaller rear sprocket on and it will give you an overall higher top speed.

Putting a LARGER sprocket in the rear will gear the dirt bike down, this will result in a LOWER top speed.

50 cc transimissions effect over all top speed

The transmission on these 50cc dirt bikes also has a major effect on the overall top speed. For example the trail 50cc dirt bikes like the Yamaha TTR50 come with a 3 speed semi-automatic transmission. These are big and bulky and only give you 3 gears. 

The transmission on the KTM 50SX is a centrifugal clutch that does not have any gears but as the motor spins faster the shoes on the clutch engage on the rim of the clutch housing transfering the power to the wheels. 

This type of clutch will allow for higher top speed than a stock 3 speed semi-automatic transsmission. 

  • So, how fast is a 50cc dirt bike?

    Commercial 50cc dirt bikes reach speeds between 24 to 40 miles per hour as 50cc motocross dirt bikes can reach speeds up to 45mph. These dirt bikes are primarily for kids between 5 to 8 years of age and can't be driven at maximum speeds as the off-road environment will not allow the dirt bike to go faster.

DirtbikeSam Banner Green

The top speed on most 50 cc dirt bikes is between the following speeds: 24-40 MPH

Fastest 50cc dirt bike

Fastest 50cc Trail Dirt Bikes:

KTM 50 SX dirt bike

Fastest 50cc Motocross Dirt Bikes:

ModelFastest Speed (Approx.)
KTM 50 SX37 mph
Husqvarna TC 5042 mph
Cobra CX50 SR (King)45 mph
Yamaha PW5025 mph
Suzuki JR5037 mph
Honda CRF50F30 mph

How to make a 50cc dirt bike go faster:

  1. Gearing
  2. More Power
  3. Aftermarket Exhaust

How do you make a 50cc dirt bike go faster? The first thing is gearing. Start with smaller sprockets and this will allow you to have more top speed. The second is to find more power. This can be done by a better air filter, exhaust system, and engine work. This allows your dirt bike to get more power on the top end, allowing for more power.

However, I cannot stress enough that the sprockets, in the end, are what will have the most effect on your top speed. Changing the 3-speed gearbox on the Yamaha TTR 50 or Honda 50 CRF is going to be VERY tough and not really a possibility for most people.

Overall, the 50cc motocross dirt bikes come with a 2 stroke motor that tends to make more horsepower per cc then a 4 stroke. The trail dirt bikes come with a air cooled 4 stroke motor which are easy to ride but not really built for speed.

KTM 50 SX dirt bike

The FASTEST 50CC dirt bike is a 50cc Motocross dirt bike

Like I mentioned above the Honda CRF50 and Yamaha TTR50 are dirt bikes that are built for trail riding. They cannot go as fast as the 50cc motocross dirt bikes. They are not built for racing.

The 50cc motocross dirt bikes will have the highest top speed of the 50cc dirt bikes!!

Dirtbike Sam

So, if you want the very fastest 50cc dirt bike you will need to go with one of the following 50cc dirt bikes:

Click here if you are interested in other 50cc dirt bikes for kids.


What to consider when buying a Dirt Bike for your kid?

As someone deeply entrenched in the world of dirt biking, and a father guiding his son through the thrilling paths of this sport with his own small Honda dirt bike, I’ve accumulated a wealth of knowledge and insights that I believe are invaluable for any parent looking to introduce their child to dirt biking. Here’s what I’ve learned:

  • Safety First: Above all, the bike must be a safe fit for your child. It should be sized so that your child can comfortably reach the ground with both feet when seated. This ensures they have control over the bike at all times, a fundamental aspect of safe riding.

  • Engine Size Matters: Start with a smaller engine (50cc to 110cc). These bikes offer power that’s manageable for beginners and help build confidence. My son started on a Honda, known for their reliability and smooth power delivery, which has been perfect for his learning curve.

  • Four-Stroke vs. Two-Stroke: For kids, a four-stroke engine is preferable. Its smoother power delivery compared to the more abrupt acceleration of a two-stroke makes it easier for a beginner to handle.

  • Durability and Maintenance: Kids will inevitably take spills. Choose a bike that can take a beating and is simple to maintain. I can attest to the durability of Honda bikes; they’re built to last, and their maintenance is straightforward, ensuring the bike is ready for the next ride.

  • Bike Weight and Suspension:

    • A lightweight bike is easier for kids to maneuver, but it must also be stable enough to handle various terrains.
    • Look for adjustable suspension systems. They can adapt to your child’s growing skills and different riding conditions, making the ride both safer and more enjoyable.
  • Consider Long-Term Value: Opt for a reputable brand. It might cost more upfront, but the reliability, availability of spare parts, and resale value make it a wise investment. From my experience, Honda has been excellent in this regard.


Drawing from my deep-rooted experience in dirt biking, along with the enriching journey I’ve shared with my son as he explores the world on his dependable Honda, I’ve gained invaluable insights into what makes this sport truly special. Our collective experiences—filled with challenges, learning, and the pure exhilaration of riding—have profoundly shaped my understanding, particularly regarding the ideal dirt bike for a young rider.

Reflecting on my years of involvement in dirt biking and observing my son’s progression, I’ve concluded that the choice of bike profoundly affects the riding experience. It’s crucial to select a model whose speed and handling correspond to the rider’s skill level and riding goals. Understanding a bike’s top speed and how it complements the rider can significantly enhance their riding journey, ensuring a balance between exhilaration and safety.

This shared adventure in dirt biking is more than just a sport; it’s a conduit for teaching responsibility, mechanical skills, and environmental respect. It’s about the bond formed through shared challenges and achievements, underscored by the dependable hum of the engine. Choosing the right bike, like the Honda CRF50F, Yamaha PW50, or KTM 50 SX, isn’t just about picking a vehicle; it’s about selecting a companion for your child’s journey of growth, learning, and unforgettable moments on the dirt trails. Our past rides echo with lessons and memories, steering us towards new adventures with the wisdom of past experiences and the steady rhythm of the dirt bike’s pulse.


FAQ About How Fast Does a 50cc Dirt Bike can Go?

  • So, how fast is a 50cc dirt bike?

    Commercial 50cc dirt bikes reach speeds between 24 to 40 miles per hour as 50cc motocross dirt bikes can reach speeds up to 45mph. These dirt bikes are primarily for kids between 5 to 8 years of age and can't be driven at maximum speeds as the off-road environment will not allow the dirt bike to go faster.

  • What is the top speed of a 50cc dirt bike?

    The top speed of most 50cc dirt bikes ranges from 25 to 40 miles per hour. However, this can vary based on the bike’s make, model, and modifications, as well as the rider's weight and the terrain.

  • How does terrain affect the speed of a 50cc dirt bike?

    Rough, uneven terrain can reduce the bike’s speed due to the increased demand on the engine and the need for the rider to slow down for safety. Conversely, a smooth, flat surface can allow the bike to reach or maintain its maximum speed.

  • Are there different types of 50cc dirt bikes with varying speeds?

    Yes, there are different models and types of 50cc dirt bikes, such as those designed for motocross or trail riding, and each type may have a slightly different top speed due to its design and intended use.

  • What should I consider if I feel the 50cc dirt bike is too slow for my child?

    Consider the child’s skill level, experience, and maturity before opting for a bike with a larger engine. It’s crucial to ensure they can handle more speed and power safely.