How Fast is a 100cc Dirt Bike? (Maximum Speed)

Written by

James Stevens

Fact-checked by

Robert A. Verdin

how fast is a 100cc dirt bike

Are you ready to experience the thrill and speed of a 100cc dirt bike?

One of the most common questions among dirt bike enthusiasts is, “How fast is a 100cc dirt bike?” The answer may surprise you, as several factors affect the speed of these powerful yet affordable bikes.

In fact, you can expect a standard 100cc dirt bike to go as fast as 50 mph to over 65mph.

This guide will dive into 100cc dirt bike top speed, provide insights into 100cc dirt bikes, and explore the key features influencing their performance.

Overview About 100cc Dirt Bikes


A 100cc dirt bike is a popular choice for those who want to ride motorcycles in the dirt but only want to invest a little money because it is cheap.

100cc dirt bikes are suitable for off-road riding, motocross, and other types of dirt biking. These bikes are designed to handle rough terrains and have powerful engines that provide enough speed to navigate challenging trails because they are easy to maneuver.

Average Speed, Max Speed of a 100cc Dirt Bike

Several factors can come into play when it comes to the speeds of 100cc dirt bikes.

These factors include the make and model of the bike, the weight and experience level of the rider, and the condition of the terrain.

The average speed of 100cc in mph is 30 – 50 miles per hour (mph), while the 100cc dirt bike’s top speed can vary between 50 – 60 mph.

1. Different Engine Strokes

A 100cc dirt bike can have either a two-stroke or a four-stroke engine.

They have a stroke length that can affect the overall power and speed of the engine, as well as its torque and fuel efficiency. Both engine types have their advantages and disadvantages.


  • 100cc 2-stroke engine – It has a more straightforward design, is more lightweight, and delivers good performance at high RPMs. However, it requires more maintenance and consumes more fuel.

With a 2-stroke engine, a 100cc dirt bike can go as fast as 60 mph (96.5 km)

  • 100cc 4-stroke dirt bike – On the other hand, is more fuel-efficient, produces more torque at low RPMs, and is generally quieter. However, it can be heavier and more complex in design.

Most dirt bikes with this engine type can go as fast as 40 mph (65 km)

2. Different Brands and Models

The top speed of dirt bikes also varies among brands and bike models, especially when they are designed specifically for adults or kids.

Brand 100cc dirt bike model Engine type Top speed
Honda Honda CRF110 4-stroke 45 mph
Kawasaki Kawasaki KLX110 4-stroke 50 mph
Yamaha Yamaha TT-R110E 4-stroke 40 mph

Compared With Other Dirt Bikes

Indeed, the different engine capacity will determine how fast a dirt bike goes. You can refer to the table below for reference:

Engine capacity Max speed Recomended ages
50cc 30 – 45mph 5 – 8 years old
80cc 40 – 65 mph 7 – 11 years old
100cc – 110 cc 45 – 65 mph 10 – 14 years old
125 cc 55 – 85 mph 14 – 18 years old
250 cc 65 – 90 mph >16 years old
450 cc 80 – 125 mph >18 years old

Factors That Influence the Speed of a 100cc Dirt Bike


The speed of a 100cc dirt bike is influenced by several factors, including engine power, overall weight and design, transmission gear ratios, terrain conditions, air resistance, the quality and type of tires used, and the rider.

  • The engine power: This is a major determining factor in the speed of a dirt bike. The higher the engine power, the faster the bike can accelerate and reach top speeds.
  • The weight of the bike: The weight of the bike closely affects the speed and handling of the bike. A lighter bike with good suspension can handle harsher terrain and obstacle courses quicker than a heavier bike with less advanced suspension.
  • The design of the bike: Including aspects like the shape of the body, the handlebars, and the wheelbase also affects the speed and handling of the bike.
  • The transmission gear ratios: It will also affect how fast a 100cc dirt bike can go. The smaller the gear ratios, the faster the bike can accelerate and reach top speeds.
  • The quality and type of tires used: The tire used on a dirt bike also significantly affects its speed. Tires with broader and deeper treads provide better traction. They can improve the bike’s handling, allowing it to reach higher speeds on different types of terrain.
  • Terrain conditions: These can greatly affect the performance and handling of a dirt bike. The texture of the surface, such as the presence of sand or mud, can impact the bike’s ability to gain traction and acceleration.
  • Air resistance or drag: It can impact the speed of a 100cc dirt bike as it increases the bike’s velocity. At higher speeds, the bike has to overcome more drag, which can cause a decrease in acceleration and maximum speed.
  • Rider: A rider’s body position, weight, and experience level are key factors that can affect the speed of a 100cc dirt bike. A skilled rider who can shift gears, maintain momentum, and take corners properly can reach faster speeds than a novice rider.

Fastest 100cc Dirt Bikes


The Honda CRF100F and Kawasaki KX100 are considered two of the fastest and most powerful 100cc mini bikes on the market.

1. Honda CRF100F (65 mph)

It is designed with powerful engines of a Honda 100cc dirt bike. It has an air-cooled and four-stroke engine that delivers impressive torque for excellent momentum and easy navigation on tough terrain.

2. Kawasaki KX100 (60-70 mph)

The Kawasaki 100cc dirt bike has a liquid-cooled, two-stroke engine that provides quick acceleration and impressive speed, especially on straightaways.

Tips to Increase the Speed of 100cc Dirt Bike

Here are some tips to increase the speed of a 100cc dirt bike:

  1. Reduce weight: Consider removing any unnecessary parts, reducing fuel or fluid weight, or swapping heavier components for lighter ones.
  2. Upgrade the air filter and exhaust system: Cheap 100cc.dirt bikes might not have the best air filter system. Improving airflow by installing a high-performance air filter and exhaust system can help increase the engine’s power and top speed.
  3. Replace the sprockets and chains: Changing the sprocket size can help improve acceleration or top speed. A smaller sprocket will provide higher acceleration. Meanwhile, a lighter chain will help reduce friction.
  4. Upgrade the tires: Replacing the stock tires with high-performance, lightweight tires can improve acceleration and handling, resulting in better speed.
  5. Improve the engine performance: Adding fuel injection or nitrous oxide systems, upgrading the carburetor, or installing a high-performance ignition system can significantly improve engine performance.
  6. Regular maintenance: Regularly cleaning and lubricating the bike’s chain, ensuring the bike’s brakes are in good condition, and cleaning the air filter can all affect the bike’s speed.

By following these tips, riders can increase the speed of their 100cc dirt bikes and enjoy faster and more thrilling rides.

Frequently Asked Questions


Is a 100cc dirt bike suitable for beginners?

These bikes are relatively small, lightweight, and easy to handle, making them a great choice for those just starting.

They’re also less powerful than larger bikes, which can benefit beginners learning to control their speed and navigate different terrain types.

Tips for riding a 100cc dirt bike safely

Here are some suggestions for riding a 100cc dirt bike safely:

  • Always wear appropriate safety gear, including a helmet, boots, gloves, and goggles.
  • Take a dirt bike safety course to learn the basics of riding, balance, and control.
  • Start with easy terrain and gradually increase the difficulty level as you gain more experience.
  • Maintain your dirt bike regularly and check the brakes, tires, and other components before every ride.
  • Never ride beyond your skill level, and always ride with caution, especially when approaching unfamiliar terrain.


How fast is a 100cc dirt bike? Well, you can enjoy a ride at 50 – 60mph with this type of dirt bike. It can be fun and exhilarating as long as you prioritize safety by wearing the appropriate gear, understanding your bike’s capabilities, and following the basic rules of the road or trail.

By following these tips and taking necessary safety precautions, you can significantly reduce the risk of accidents and injuries and ensure your riding experience is as safe and enjoyable as possible. Remember, safety always comes first.

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James Stevens

James Stevens is an expert bike mechanic who knows everything from basic repairs to custom modifications. What sets him apart is his ability to explain complex concepts in a way that's easy to understand. Check out his content on Speedway if you need help with upgrades or modifications for your bike.