How Fast Does A 125cc Dirt Bike Go? Top Full Guide 2023

How Fast Does A 125cc Dirt Bike Go Top Full Guide 2023

A 125cc dirt bike is a small, lightweight motorcycle designed for off-road riding. These bikes are typically single-cylinder and have a low power output, making them ideal for beginners or riders who want a smaller, more maneuverable bike. So, how fast does a 125cc dirt bike go?

How Fast Does A 125cc Dirt Bike Go?

What Is The Speed Of A 125cc Dirt Bicycle

The max speed of a 125cc dirt bike is typically between 55 and 60 mph. Since most riders haven’t mastered the art of dirt riding yet, they won’t reach these maximum speeds.

At least one other person will be racing at a top speed of 100 mph. On the other hand, the dirt bike is being pushed too far. The 125cc engine’s power output is significantly lower than its larger rivals. Even though it’s slow, you can speed it up with a few performance tweaks and riding techniques.

Numerous Variables Affect A 125cc Dirt Bike’s Top Speed

The operating speed of a 125cc dirt bike can be affected by a variety of factors, such as the following:

If so, have you ever been to a dirt bike race? There is a good chance that you’ve overheard riders and dirt bikers arguing about who was the fastest on a particular trail. These motorbikes are available in a variety of sizes and power outputs.

But the average top speed of these motorcycles depends on engine size, sprocket gearing, and many more. An in-depth look at the factors contributing to the top speed of dirt bikes, particularly those with 125cc engines, is provided here.

Two-Stroke Vs Four-Stroke

This is an important consideration when purchasing your dirt bike’s engine. As a result, it directly impacts everything from overall performance to response time.

Numerous Variables Affect A 125cc Dirt Bike's Top Speed.

In a 2-stroke engine, compression and combustion are the primary functions. It’s fast and hard, which makes it a great track weapon. Though more common on older dirt bikes, if speed is more important to you, this is a better option because you can get up to 60 mph with it.

A 4-stroke engine, on the other hand, can reach an average maximum speed of around 50 mph. Sluggishness is exacerbated by the tractor’s size and the engine’s weight.

Size Of The Engine

As previously mentioned, all types of motorcycles have a variety of engine sizes. This factor is critical for the bike’s speed and horsepower.

Standard dirt bikes with engines ranging from 50 to 140 cubic centimeters of displacement. Other versions with 175-to-250-cc engines are available from most manufacturers, but these are far larger than the standard motorbike class that characterizes dirt bikes.

Dirt bikes are designed to reach maximum revolutions per minute (rpm) faster in each gear to keep pace with other types of bikes, such as bit bikes. For a 50cc bike, the top speed can range between 15 and 25 miles per hour when riding in the lower gears. However, the bike can reach speeds of up to 50 miles per hour or more on longer stretches.

When riding in high gear on 125cc dirt bikes with the stock sprocket gearing, you can expect to reach speeds of 70 mph. As a result, a dirt bike’s engine size is significant in determining its speed.

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Using Sprockets To Change Gears

It’s essential that your dirt bike’s base ratio gear can be made with the smaller front drive sprocket and the larger rear sprocket gearing. Dirt bike manufacturers take this approach to reach as many people as possible on the market today.

To achieve a base gear ratio, you need to set up dirt bikes with gearing combinations capable of delivering the overall performance.

The most common sprocket gearing configuration is 14/42. To put it another way, the front of your bike has a 14-tooth drive sprocket, while the back has a 42-tooth sprocket.

For example, the average max speed of (for example) a 50cc dirt bike ranges from 22 to 25 miles per hour if you use the engine revolutions per minute red line as your benchmark.

Using Sprockets To Change Gears

This conclusion is drawn based on the vehicle’s top speed of 15 miles per hour in first gear.

On the other hand, the gear allows you to reach a top speed of 50 miles per hour. A 125cc dirt bike’s average speed will likely be 35 miles per hour if you use this same red-line benchmark. Based on the information provided here, a dirt bike’s sprocket gearing is essential in how fast it can go.


Your dirt bike’s speed can be increased or decreased by making modifications. The only way to look at it positively is to increase the speed. Everyone wants to be able to outrun their rivals on their dirt bikes.

What if you want to increase your bike’s average speed without sacrificing its low-end torque acceleration? The answer is clear and straightforward. A sprocket replacement is the first step in upgrading your dirt biking.

To get the bike’s top speed, you could, for example, go from the factory 14-tooth drive sprocket to a 15-tooth one. On the other hand, a 32-tooth gearing on the back of your pit bike racing will add speed but reduce the low-end torque acceleration of your bike.

In the eyes of many 50cc race mechanics, a gain of no more than three miles per hour in average speed is exceptional. Because dirt bikes are designed for the most challenging terrains, it’s not a bad idea to consider this option.

A five-mile-per-hour increase in your 125cc motorcycle’s top speed can mean the difference between first and last place in a group of riders on a dirt bike expedition.

By understanding how sprocket gearing works, you can find ways to increase your bike’s average speed without sacrificing its ability to accelerate quickly from a standstill.

When getting your bike to top speed quickly, torque acceleration is essential. The speed of your dirt bike can be significantly increased by making modifications.


Time trials are an excellent way to figure out your dirt bike’s top speed. Using this type of test, riders can find out exactly how fast their dirt bikes are capable of going.

A well-defined course and the participation of three riders—one new to dirt bikes, one who can keep accurate time, and a third who is an experienced rider—are required to get the best results.

Allow each rider to complete a minimum of three complete laps of the designated course to obtain an average time for each individual. You’ll be surprised to learn that your data will likely match the calculations based on your dirt bike’s engine size and sprocket gearing once you’ve completed this exercise.

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You may conclude that the dirt bike’s average speed is directly proportional to the rider’s level of experience and expertise (or team).

There’s no doubt that dirt bikes are safer than their larger counterparts because of their much slower top speed. This is an intentional design choice on the part of manufacturers.

For dirt bike safety concerns, the manufacturer’s specifications of the same model of bikes are the most critical factor. These 125cc dirt bike time trials are essential in helping you determine the top average speed your dirt bike can go no matter where you ride it.

125cc Dirt Bike Performance Tips and Tricks

We don’t expect much from a 125cc bike because it’s simple and often aimed at beginners. However, there are a few things you can do to help it perform better, such as the following:

Work on Your Physical Fitness

You need more than just a dirt bike to go full speed on a racetrack. Physical health is just as important as mental health. Prepare your body for the rigors of the ride by utilizing this method. The easier it is to reach the dirt bike’s top speed, the more fit you are.

The proper stance is an essential skill to master, among many others. This will allow you to achieve the perfect equilibrium while riding. By doing so, you improve the bike’s handling and distribute your weight evenly.

Having a healthy body is essential. You’ll gain mental and physical strength as a result of this. Thus, you’ll be better prepared to take on the track’s challenges and think clearly enough to unleash your inner beast while riding your dirt bike.

Disconnect And replace the exhaust pipe

A well-prepared rider will not be as fast on a poorly-equipped bike, even if they are physically and mentally ready. With this information in mind, the exhaust is one of the most promising upgrades you can make.

125cc Dirt Bike Performance Tips and Tricks

The exhaust system wouldn’t be complete without a muffler. The addition of a pipe in a two-stroke dirt bike engine or a slip-on in a four-stroke engine can yield incremental speed gains. A newbie can do this muffler upgrade in 15 minutes or less, making it a quick and straightforward fix.

Adjust the Suspension

At first glance, an aftermarket 125cc dirt bike suspension might appear expensive. You’ll see that it’s worth it once you learn how it can speed things up. Because it absorbs shock, it will also make your bike more comfortable.

A vehicle’s control is improved thanks to a better suspension, even in the most challenging terrains. Improved management of the bike will allow you to increase its speed. In addition, it improves the bike’s overall balance.

Cleanliness is Key!

You can still get your dirt bike faster if you don’t have much money to spend on aftermarket modifications. This can be achieved by cleaning regularly. Mud and dirt buildup on the bike’s tires and other components can cause it to lose speed over time.

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The dirt bike’s components will wear out faster if they are not properly maintained. Speed is also negatively impacted as a result. In addition to cleaning, you may want to replace any parts that are no longer working correctly.

Maintaining the cleanliness of your dirt bike also necessitates regular lubrication. Make sure that everything is running smoothly by doing this. Because otherwise, the cycle could become sluggish and unresponsive.

Essential Safety Considerations

When riding a 125cc dirt bike, safety is more important than speed. Keep in mind the following safety precautions, especially if you’re a young or inexperienced rider:

Follow the Speed Limit

There is probably no speed limit when riding on muddy tracks or riding downhill, so you can go as fast as you like, depending on your bike’s capabilities. However, if you plan to ride the bike on public roads, downhill road conditions, make sure you adhere to the posted speed limit.

Being Aware of Your Environment

Another essential safety tip is familiarizing yourself with the surroundings. Look around before you get on the bike. Make a note of the type of terrain you’ll be riding on. Take a look at the route on the map or at the detours. As a result, you’ll have a better idea of what to expect when riding. It’ll also help you mentally get ready.

Your Dirt Bike Needs A Checkup.

Before every ride, thoroughly inspect your dirt bike. Ensure that everything, from the engine to the seat, is in working order. If there is a problem, get it taken care of right away. You should not continue the ride if you know that the issues will make it unsafe. If this is the case.

125cc Dirt Bike Performance Tips and Tricks

Dress Correctly for the Weather

Make sure you’re prepared for any eventuality. Make sure it’s not too heavy so you can move a dirt bike quickly. Additionally, ensure that the vehicle is safe and secure for your entire journey. Take care of yourself by investing in protective gear such as knee pads and helmets.

Analyze Your Capabilities

Do not exceed the top speeds at which you are capable of operating. Assume that you know yourself best, and then set a limit for yourself. As a beginner, begin by taking it easy and gradually increase your speed as you become more proficient.



How fast does a 250cc dirt bike go?

Acceleration is a big part of the fun of going fast. 250cc dirt bikes can achieve top speeds in as little as 4 seconds on average! That’s a lot of strength!

How fast does a 450cc dirt bike go?

A 450cc dirt bike can reach a top speed of 110mph.


The 125cc dirt bike is the most popular category in the market. Compared to the other types, it is a smaller bike with low power. But with the right accessories, such as the riding boots and helmet, a 125cc dirt bike can be a fun ride for beginners. BSXInsight hope you have good riding and safe riding!

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