How Fast Can Dirt Bikes Go (50cc to 500cc) | DBA

The agility and versatility of dirt bikes make them popular off-road vehicles that cater to riders of all skill levels. Experts admit speed is an undeniable factor in this sport.

A crucial factor before purchasing a dirt bike is its engine size. The engine size determines the speed and power of a dirt bike and choosing the right engine size proves to be a game changer. 

The larger the bike’s engine is, the faster it will be. In the article below, we will discover the top speed and technical comparison of most dirt bike engines and how some factors and accessories affect the speed of a dirt bike. 

So, buckle up & discover how fast dirt bikes are concerning engine size. This is going to be a roundup post. Check out more articles below to find in-depth information for each engine size.

How Fast Are Dirt Bikes | Engine Size & Speed Comparison

Let’s look into each engine size and top speed to discover how fast these dirt bikes are.

How fast is a 50cc dirt bike?

The top speed of a 50cc dirt bike lingers between 25-45 mph making it an ideal choice for kids. The average horsepower of a 50cc dirt bike is 3-5 hp and it typically weighs around 90 and 120 lbs for a 2 & 4-stroke engine.

Check this Guide to find the exact speed of 50cc Dirt Bikes

50cc Dirt Bikes Technical Comparison 

How fast is a 70cc dirt bike?

Faster than a 50cc dirt bike is a 70cc dirt bike with a top speed of 35-50 mph. The average dry weight of a 70cc dirt bike is 81 kg while it produces a maximum power of 5.19Ps at 7500 rpm.

The maximum torque a 70cc dirt bike generates is 0.519kgm at 5500 rpm. This bike is best for kids aged 7 to 10 years.

Related: How fast is a 70cc Dirt Bike

70cc dirt bikes Technical Comparison

How fast is an 85cc dirt bike?

85cc dirt bikes have an average speed of 50-55 km/h. Some models may hit up to 65-80 km/h in exceptional cases depending upon the model, tire pressure, road type, and weight of the bike. 

The average weight of an 85cc dirt bike is 140-160 lbs, generating around 22 hp power, and a 85 cc dirt bike is good for kids from 9 to 15 years old.

Related: How fast is a 85cc Dirt Bike

85cc Dirt Bikes Technical Comparison

How Fast Is a 100 cc Dirt Bike? 

One of the best dirt bikes for novice riders, a 100cc will go up to 40-65 mph. Depending upon the type of engine used, a 100cc generally weighs around 150-200 lbs. 

A 100cc dirt bike is more powerful than all 40cc to 85cc and is capable of producing up to 30hp. Some factors alter the horsepower of a dirt bike. See More for Speed of a 100cc Dirt Bike

• X-PRO X12

Talking about one of the best youth 100c dirt bikes, the X-PRO X12 with its 30 mph speed, automatic transmission, and air-cooled compression is a unique, eye-catching machine.

It features a single-cylinder 107cc engine and a cradle-type steel tube frame that makes it lighter yet stronger to handle big jumps. This bike has a net weight of 115.7 lbs and is capable of carrying a 165 lbs rider.

It delivers a maximum power output of 5.0/8000±500 kw/r/min and a maximum torque of 7.5/5500±500 N.m/r/min. X-PRO X12 has a fuel capacity of 33.5l/0.92 Gal and a seat height of 24” making it ideal for beginners.

100cc dirt bikes Technical Comparison

How Fast Is a 125 cc Dirt Bike?

The top speed of the best 125cc dirt bike is 75 mph. With the power of 30 hp and 198 lbs curb weight a 125cc dirt bike offers an adventurous riding experience of riders.

How Fast is 125cc Dirt Bike

• XPRO 125cc

XPRO 125cc features a cradle-type steel tube high & longer frame and 17″/14″ big front/rear wheels and is designed for big boys who enjoy full control over the bike.

The XPRO 125cc dirt bike offers more ground clearance due to a long frame, extending its use for two more years. The tube frame is not only lighter but also stronger, which makes it easier to perform big jumps.

125cc dirt bikes Technical Comparison 

How Fast Is a 150 cc Dirt Bike?

A 150cc dirt bike after certain modifications can go as fast as 75-85 mph. The average weight of these dirt bikes generally falls around 215 lbs and is good for children above the age of 14 and teens. The maximum torque of a 150cc dirt bike is 13.25 Nm with a top power of around 14 PS @ 8500 rpm.

150cc Dirt Bikes Top Speed

• XPRO HAWK 150cc

The X-PRO Hawk features a powerful  4-stroke engine and is a dirt bike perfect for off-road adventures.

The bike also offers an adjustable rear mono shock for extra comfort when riding on rough terrain, ensuring your safety as you explore the limits of this dirt bike.

The big 19″ front and 16″ rear tires provide excellent speed and traction, enabling you to push the limits of your dirt bike.

125cc dirt bikes Technical Comparison

How fast is a 250cc dirt bike?

One of the fastest bikes, the 250cc can spike up to 85 mph. Though it does not seem typically fast, in the world of off-roading, this is quite a speed.

A 250cc dirt bike is designed to attain such a speed due to its high-powered engine and low weight of around 200-300 lbs.  These bikes comprise a high torque engine making them easier and faster to go on uneven terrain.

How fast can a 250cc dirt bike go?

• X-PRO Titan 250cc

The X-PRO Titan 250cc has a powerful and long-lasting 223cc engine with 5-speed manual transmission and a chain drive system. It has a top speed of 60 mph, depending on the rider’s weight and road conditions.

The bike has a weight capacity of 250 lbs and weighs 242 lbs. Fuel capacity of 2 gallons and comes with both kick and electric start options. The frame is made of high-strength steel with precision welding, making it lighter and stronger.

The UV-resistant paint and high-strength plastics are durable and strong with an upgraded muffler to reduce exhaust noise.

250cc Dirt Bikes Technical Comparison

How fast is a 450cc dirt bike?

450cc dirt bikes have a speed of around 100-110 mph. These bikes mostly accompany a 4-stroke engine, are massive, and deliver more manageable acceleration.

These bikes come with a steady power output of 52hp and 32 lb-ft torque and if regularly maintained can be the best partner for velocity enthusiasts.

450cc dirt bikes Technical Comparison

How fast is a 500cc dirt bike?

Depending upon the type of bike, terrain, and rider’s experience, a 500cc dirt bike can go as fast as 120 mph. 500cc dirt bikes have a seat of 37-38” and are mostly preferred by experienced riders with a good height of 5.9”.

Honda CR500 and Kawasaki KX500 are the most famous 2-stroke 500cc dirt bikes while KTM 500 EXC-F and Husqvarna 501FE have 4-stroke engines. The average weight of a 500cc dirt bike is 215 lbs with the enormous power of 60 hp to stand with agility lovers.

500cc Dirt Bikes Technical Comparison

What is the top speed of an electric dirt bike?

Electric dirt bikes for adults have a top speed of 98 mph. One of the most popular electric dirt bikes is the Razor MX500.

• Razor MX500

An electric dirt bike for adults powered by a 650-watt high-torque chain-driven motor, this bike can reach speeds of up to 15 mph.

The tires of this bike help to absorb shocks, providing a smoother ride on rough surfaces. It also has folding metal foot pegs, hand-operated dual disk brakes, shatter-resistant plastic fairings, and a retractable kickstand.

The rechargeable 36V battery system of Razor MX500 can provide up to 40 minutes of continuous use and takes 12 hours to fully charge.

How fast are Razor dirt bikes?

Razor is the leading manufacturer of electric vehicles for kids and their electric dirt bikes are a powerful, eco-friendly, and great option when it comes to kids’ safety. Generally, Razor dirt bikes go as fast as 12 mph-22 mph.

• Razor MX 350

is a mini electric motocross, off-road bike, specifically designed for kids aged 13 years and above. The bike weighs around 140 lbs with a top speed of 14 mph. 

Razor MX 350 with its single charge of 24V, offers up to 30 minutes of continuous use, powered with high torque and increased traction. This bike is a part of Razor’s Dirt Rocket line and comes with a rechargeable battery system to offer young riders an exciting off-road adventure.

• Razor MX 400

The Razor MX400 Dirt Rocket is a dirt bike designed for teens ages 13 years and older or for riders with a maximum weight of 140 pounds. Equipped with a rechargeable 24V sealed lead-acid battery system, the bike provides continuous use while building confidence, and control. 

It comes with a 250-watt high-torque, chain-driven motor, and can go up to 14 mph (22 km/h). The spoked 12-inch pneumatic knobby tires help soften rough surfaces for a smooth ride, and the all-steel frame with authentic dirt bike geometry provides a solid off-road ride.

Riders can enjoy speeds up to 14 mph for up to 30 minutes of continuous use (up to 10 miles on a single charge). The Razor MX400 Dirt Rocket is an ideal toy for kids and teens who aren’t afraid of a little dirt and want to experience the thrill of off-road adventures.

• Razor MX 650

The Razor MX 650 can travel up to 10 miles on a single charge, making it perfect for off-road adventures. The 16 and 14-inch pneumatic knobby tires provide maximum power and a high-torque motor with twist grip throttle control can kick the dirt bike into a high speed of up to 17 mph.

Equipped with a 36-volt sealed lead-acid battery system, this bike generates more power for uphill and off-road conditions. It is a high-torque, electrically powered motocross bike designed for kids aged 16 years and older who weigh up to 220 pounds.

Factors to Consider in a Dirt Bike Engine Size

When choosing a dirt bike, several factors determine which size suits you best. You must take these factors seriously:

• Engine Size:

Cubic Centimetres (cc) refers to the volume of the engine’s combustion chamber. Engine size determines the power output of the bike and is an essential factor to consider. 

The bigger the engine, the more powerful the bike will be. However, bigger engines also mean higher costs, heavier weights, and more advanced riding skills requirements.

• Engine Type: 

Dirt bikes are available with two different types of engines – 2-stroke and 4-stroke. 2-stroke engines are lighter and have more power at higher RPMs, while 4-stroke engines are more fuel-efficient and have better low-end torque.

• Technical Factors:

The horsepower (HP) and torque of the bike are essential technical factors to consider. Higher horsepower provides greater top-end speed, while higher torque provides more low-end power. 

Technical factors such as suspension, brakes, and tires also need to be considered, depending on your intended use.

• Rider Experience: 

The rider’s age, size, weight, and experience level are crucial considerations when choosing a dirt bike. Young and inexperienced riders should select smaller engine sizes and lightweight bikes, while older and experienced riders can opt for larger engines and heavier bikes.

• Intended Use: 

The intended use of the bike is another crucial factor to consider. Dirt bikes designed for recreational use are usually less powerful and less expensive than those built for racing.

 You should also consider the terrain and weather conditions where you plan to ride. Different bikes perform better in different conditions, so choose accordingly.

• Budget:

Dirt bikes come at various prices, so it’s crucial to set a budget before selecting a bike. Consider the cost of maintenance, repairs, and upgrades before making a final decision.

Tips for Maximising Speed and Performance 

• Reliable air filters

Premium air filters are essential to moving more air into the bike’s engine. Air filters vary in their type and serve to allow maximum and constant airflow while preventing dust and dirt from entering the machine.

These filters come with a tight-fitting seal to protect the bike’s air box. The mechanism works by shutting out the bigger dust particles on the outer layer and even smaller particles on the second layer.

• Throttle

Works by regulating the fuel combustion in the bike’s engine, the throttle is another essential of dirt bikes. By pushing the throttle, the rider can increase the amount of fuel combustion and generate more power.

Mastering the use of the throttle is an important skill that allows riders to maximize speed and acceleration.

• Accurate tire pressure

Inflating your tires to the correct pressure will prevent issues like excessive damage or uneven ride. Underinflated tires can cause excessive wear and tear on the tire’s sidewalls,  increasing the risk of blowouts.  Overinflated tires, on the other hand, can cause a harsh ride.

• Upgrade the exhaust system

Choose a high-quality exhaust system from a reputable brand that is compatible with your bike’s engine. Revamping the exhaust system will increase the flow of exhaust gases, hence improving the speed and performance of your dirt bike.

• Regular maintenance 

First, read out your bike’s manual for the recommended maintenance schedule. Then follow the maintenance procedure that generally involves

• Regular cleaning and washing

• Regular oil changes

• Proper chain lubrication

• Air filter cleaning and replacement
• Spark plug replacement

• Focus on your skills

Finally, the most essential factor in improving your dirt bike’s speed and performance is consistent practice and training. Develop your riding skills, experiment with different techniques, and push yourself to improve your speed and performance gradually.

Safety First Policy

For dirt bike riders, it is mandatory to wear safety gear to reduce the risk of injury in case of an accident.

Along with that, dirt bike riders should always follow the speed limit and know when it is appropriate to speed up and when it is not. 

Here are some points to consider:

• Protective Gear:

Riders should wear protective clothing to ensure maximum protection. Wearing a helmet is essential as it protects the head from severe injuries. Gloves and boots protect the hands and feet and can prevent cuts, bruises, and burns. 

• Gear Recommendations:

Apart from helmets, gloves, and boots, riders should consider wearing additional protective gear such as chest protectors, knee and elbow pads, and goggles. These protectors provide added safety and can prevent severe injuries in case of a crash.

• Speed Limit:

Dirt bike riders should always adhere to the speed limit, especially in areas with high pedestrian or vehicular traffic. Exceeding the speed limit increases the risk of accidents, which can be life-threatening.

• When to Speed:

Speeding is appropriate in designated areas, such as race tracks or open fields, where there are no obstacles or pedestrians. However, even in these areas, riders should always wear protective gear and adhere to safety guidelines.

• When Not to Speed:

Dirt bike riders should never speed in areas where there is a high risk of accidents, such as crowded areas, narrow trails, or steep inclines. Riders should also be cautious of the weather and terrain conditions before speeding.

Frequently Asked Questions | How Fast are Dirt Bikes

• How fast does a 90cc dirt bike go?

Depending upon the terrain surface, a 90cc dirt bike can go up to 80 km/h.

• How fast are 110cc dirt bikes?

A 110cc dirt bike can reach a top speed of 35-45 mph. Although some brands claim their bike models reach 60 mph too. However, that depends upon certain other factors like the bike’s model, age, terrain,  rider’s weight, etc.

• How to make a dirt bike go faster?

Here are the suggestions to make a dirt bike go faster

• Always stick to regular and proper cleaning and maintenance.

• Upgrade the air filters to clear the carburetor.

• Use perfect size tires to practically spike up the speed.

• Use better quality fuel.

• Replace factory clutches with race-specific clutches.

• Modify your bike’s chain and sprockets.

• Upgrade the exhaust system to reduce the bike’s weight.

• Are dirt bikes faster than cars?

Although dirt bikes are smaller, lighter, and gain speed faster, cars tend to have more powerful engines and better traction control, making them faster than dirt bikes on the track.

• How fast are Honda dirt bikes?

Honda XR with its powerful 650cc engine can go up to 110 mph, while Honda CRF450F can go up to 100 mph.

• How fast does a dirt bike have to be street-legal?

It is not about the speed or the engine type to determine that a street bike is legal not. In fact, it’s all about tires, lightning, and safety equipment to make a dirt bike street-legal.

Conclusion

The speed of dirt bikes is determined by their engine size and various other factors. We have explored the top speeds of different engine sizes, ranging from 50cc to 500cc, and provided insights into how they affect the overall performance of the bike.

When buying a dirt bike, it’s important to consider your skill level, riding style, and terrain to choose the right engine size for you. Additionally, maintaining your dirt bike with regular servicing and ensuring proper gear and safety measures can help improve your speed and control.