The average speed of a dirt bike ranges from 40 to 90 miles per hour, depending on factors such as engine size, horsepower, terrain, and rider skill. In this article, we’ll explore the different speeds of dirt bikes based on engine power and provide insights into what makes these machines so exhilarating to ride.
Dirt Bike Speeds According to Engine Power in cc
The engine size, or cubic capacity (cc), plays a significant role in determining the top speed of a dirt bike. Adult dirt bikes typically feature engine sizes between 230cc and 450cc, while younger riders or children might ride bikes with engine sizes from 50cc to 150cc. As the engine size increases, so does the bike’s speed, although factors such as rider weight and terrain can also impact performance. Here’s a breakdown of average speeds for dirt bikes ranging from 50cc to 450cc.
- 50cc dirt bikes: With speeds between 25-40 mph, these bikes are relatively easy to control and ideal for kids just starting in the sport.
- 65cc dirt bikes: These novice-friendly, small, and lightweight bikes can hit a maximum speed of 62 mph.
- 80cc dirt bikes: These models can reach speeds of 45-55 mph, with some engine variants capable of surpassing 55 mph.
- 100cc dirt bikes: Depending on engine tuning, these bikes can achieve top speeds of 50-80 mph.
- 110cc dirt bikes: These can travel up to 50-55 mph.
- 125cc dirt bikes: Capable of reaching top speeds of 55-60 mph, these bikes can go even faster with a heavy rider on downhill roads.
- 125cc 4-stroke bikes: Depending on specifications, some can top out at 35 mph, while others can reach 55 mph.
- 150cc dirt bikes: With average speeds of 50-60 mph, experienced riders can push these bikes even faster.
- 200cc dirt bikes: These powerful bikes can run as fast as 60 mph and compete in racing competitions.
- 250cc dirt bikes: Speeds vary based on engine type, but these bikes can typically reach 70-80 mph.
- 400cc dirt bikes: With an average top speed of 87 mph, this category has a significant speed gap between different models.
- 450cc dirt bikes: These can reach up to 90 mph, depending on modifications, rider weight, engine stroke, and terrain.
Dirt Bikes Brands, Engine Power, Top Speed
Adult Dirt Bikes
| Brand & Model | Engine (cc) | Top Speed (MPH) | Stroke |
| Honda CRF | 450 | 87 | 4 |
| Honda XR | 650 | 110 | 4 |
| Suzuki DR-Z | 400 | 114 | 4 |
| Suzuki RM | 250 | 78 | 2 |
| Yamaha WR | 250 | 88.8 | 4 |
| Kawasaki KLR | 650 | 98 | 4 |
| Kawasaki KX | 250 | 76 | 2 |
| Kawasaki KX | 450 | 89 | 4 |
| Husqvarna FE | 510 | 101.5 | 4 |
| MuZ Baghira | 660 | 102 | 4 |
| KTM SX | 250 | 71 | 2 |
Kids Dirt Bikes
| Brand & Model | Engine (cc) | Top Speed (MPH) | Stroke |
| KTM 50 SX | 50 | 45 | 2 |
| KTM 65 SX | 65 | 62 | 2 |
| Honda CRF125F | 125 | 45 | 4 |
| Yamaha TTR | 50 | 30 | 4 |
| Apollo DB25 | 70 | 37 | 4 |
| RPS Xmotos | 70 | 50 | 4 |
| Coolster QG50 49cc | 50 | 30 | 2 |
| DR-X Holeshot 50cc | 50 | 25 | 2 |
| Kuberg 2016 Freerider | 48 Volt Motor | 34 | N/A |
| Razor SX500 McGrath | 36 Volt Motor | 15 | N/A |
How Does Bike Size Impacts Top Speed & Bike Performance?
When selecting a dirt bike, it’s essential to prioritize fit and experience level over speed potential. Purchasing the fastest bike available will be of little use if it’s too small or large for the rider, ultimately serving as little more than an attractive garage ornament.
Adult bikes typically feature engine sizes between 230cc and 450cc, while younger adults or children may ride bikes with engine sizes ranging from 50cc to 150cc. Several factors impact a dirt bike’s speed and performance.
- Higher cubic capacity (cc) results in a faster bike
- Lower cc leads to a slower bike
- Some smaller dirt bikes may have 110cc engines
- A heavier load on the bike can slow down its performance
Motocross riders are among the fittest athletes globally, as they endure intense physical and mental challenges to excel in races, much like the rugged trails they navigate
Tips to Increase Your Dirt Bike’s Top Speed
- Maintain the engine by cleaning the exhaust pipe and muffler from dirt and carbon byproducts.
- Remove the adjustable speed restriction (RPM limiter) with the help of professionals or by consulting the manufacturer.
- Lubricate the chain, sprockets, and joints with synthetic motor oil.
- Use higher-octane gasoline recommended by the seller.
- Replace original spark plugs with V-notch ones for quicker and more effective ignition.
- Improve sprocket gearing by increasing the number of teeth on the front sprocket while decreasing the teeth on the rear sprocket.
Which Dirt bike is better: 2-stroke or 4-stroke?
The final decision must be yours. Let’s check out the features of each engine to help you make a well-informed decision.
2-Stroke
- Powerful burst
- Lightweight
- Faster acceleration than 4 stroke due to being lightweight
- Requires regular gear changing
- Pre-mixing oil and gas
4-stroke
- Smooth and consistent power delivery
- Durable and easy to ride than a 2-stroke
- Doesn’t require oil and gas mixing
- Easy maintenance
- The engine is complex compared to 2-stroke
Top 5 Fastest Bikes in the World
KTM 450 SX-F: The KTM 450 SX-F is a powerful, performance-oriented dirt bike with a 450cc engine, providing impressive power and torque. Known for its racing capabilities, it is popular among motocross enthusiasts. Its lightweight design and advanced suspension system offer excellent handling and agility on the track.
Honda CRF450R: The Honda CRF450R is a versatile, well-rounded dirt bike for racing and off-road adventures. It boasts a fuel-injected 450cc engine that delivers reliable power and performance. The CRF450R is widely praised for its handling capabilities and responsive suspension, making it a favorite among riders of various skill levels.
Aprilia RXV 5.5: The Aprilia RXV 5.5 is a unique and innovative dirt bike featuring a V-twin engine layout that sets it apart from its competitors. Its 550cc engine provides abundant power output, while its lightweight chassis and advanced suspension system ensure responsive handling and stability. The RXV 5.5 is well-suited for those looking for a distinctive and powerful off-road machine.
BMW G650 XChallenge: The BMW G650 XChallenge is a versatile, adventure-ready dirt bike that caters to many riders. Equipped with a 652cc single-cylinder engine, it offers smooth power delivery and excellent fuel efficiency. The G650 XChallenge also features advanced suspension components and a comfortable ergonomic design, making it an ideal choice for long off-road journeys and even some light touring.
Beta 450RS: The Beta 450RS is a reliable and agile dirt bike that is built for both off-road racing and trail riding. Its 450cc engine provides ample power for tackling various terrains, while its lightweight frame and advanced suspension system offer precise handling and control. The 450RS is popular for riders seeking a versatile and capable off-road motorcycle.
