Otis Singleton
Electric bicycles, or e-bikes, offer a faster commute than traditional bicycles, with the added benefit of electrical assistance. The speed of an e-bike depends on several factors, including the power of its motor, the weight of the bike and rider, and the terrain. E-bikes are typically classified into three categories, with Class 1 and 2 e-bikes providing pedal assistance up to 20 mph, and Class 3 e-bikes offering assistance up to 28 mph. Beyond these speeds, the rider's pedalling power determines the maximum velocity. The market offers a range of e-bikes, from budget-friendly options to high-performance models, with top speeds reaching up to 104 km/h.
| Characteristics | Values |
|---|---|
| Average speed range | 15-20 mph (24-32 km/h) |
| Class 1 e-bike assistance speed | Up to 20 mph |
| Class 2 e-bike assistance speed | Up to 20 mph |
| Class 3 e-bike assistance speed | Up to 28 mph |
| Top speed of some e-bikes | 80-104 km/h |
| Factors affecting speed | Terrain, weight of e-bike, weight of rider, power rating (Watts), pedaling efficiency, tire pressure, suspension, frame material |
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What You'll Learn
Electric bicycle speed limits are regulated by country
Electric bicycle speed limits are regulated differently across the world. In the European Union, electric bicycles are defined as "pedal cycles with pedal assistance which are equipped with an auxiliary electric motor having a maximum continuous rated power of less than or equal to 250 W, where the output of the motor is cut off when the cyclist stops pedalling and is otherwise progressively reduced and finally cut off before the vehicle speed reaches 25 km/h [15.5 mph]". This is the de facto definition of an electrically assisted pedal cycle in the EU, and individual member countries are left to implement the requirements in their national legislation.
In Israel, the law aligns with the EU's definition, allowing riders above 16 years old to use pedal-assisted bicycles with a power of up to 250 W and a speed limit of 25 km/h. A new law, effective from January 10, 2019, states that riders under 18 who do not have an automobile license will need a special permit.
In the United States, electric bikes are categorized into three classes, each with its own set of rules and usage permissions. Class 1 and 2 e-bikes provide pedal assistance up to 20 mph, while Class 3 e-bikes can reach speeds of up to 28 mph. The choice of e-bike class and compliance with speed limits shape the perception and acceptance of e-bikes in different communities.
In Canada, the province of Ontario has specific laws regulating electric bikes. E-bikes can reach a speed of 32 kilometres per hour and are allowed to share the road with other vehicles. Riders must be at least 16 years old, wear approved helmets, and follow traffic laws.
Each country and region has its own unique set of regulations governing electric bicycle speed limits, which riders must be aware of to ensure legal compliance and safety.
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The motor wattage impacts how fast an e-bike can go
The wattage of an electric bicycle motor impacts how fast it can go. Wattage is a measure of power, which is the rate at which energy is transferred. In the context of electric bike motors, wattage refers to the amount of power that the motor can deliver to assist the rider. A higher wattage motor generally means more power, which can lead to faster acceleration and better climbing ability. For example, a 750 W motor can accelerate from 0 mph to 20 mph more easily than a 250 W motor carrying a person of the same weight on the same terrain.
However, wattage is not the only factor that influences an e-bike's top speed. The voltage and capacity of the battery also play a significant role in speed and range. Higher voltage batteries can deliver more power, which may support higher speeds. Additionally, the bike's controller system regulates the motor's performance and may limit the power output to comply with local speed regulations. For example, in many countries, e-bikes without a license are restricted to a maximum speed of 15.5 mph (25 km/h).
The weight of the e-bike and the rider also impact the speed. A heavier load will make it more difficult for the motor to accelerate and reach top speed. Other factors that can affect the speed of an e-bike include the transmission system, tire type, and local speed regulations.
It is important to note that e-bikes have different classes, and the level of assistance provided by the motor depends on the class. Class 1 and 2 e-bikes provide pedal assistance up to 20 mph, with Class 2 also offering a throttle option. Class 3 e-bikes provide assistance up to 28 mph.
Overall, while motor wattage plays a significant role in the speed of an e-bike, it is just one of several factors that determine how fast the bicycle can go.
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The rider's weight can affect the bicycle's speed
The rider's weight can significantly impact the speed of an electric bicycle. Heavier riders may experience a decrease in speed and range, as the motor has to work harder to achieve the same acceleration as it would with a lighter rider. This is especially true when riding uphill or accelerating from a stop, as these scenarios require more power output from the motor.
The weight of the rider, along with the weight of the bicycle itself, influences the overall load that the motor has to pull. A heavier load will be more challenging for the motor to move, resulting in reduced acceleration and top speed. This principle is similar to pulling a sled, where the weight of the sled and the person pulling it determine how difficult it is to tow.
Additionally, the rider's weight can affect the rolling resistance of the bicycle. More weight on the bicycle will increase the pressure on the tires, leading to higher rolling resistance. This increased resistance will, in turn, require more power from the motor to maintain the same speed as a lighter load.
The impact of rider weight on speed becomes more pronounced when the bicycle is travelling on flat ground. Once the bicycle is already in motion, it doesn't require much additional energy to maintain its speed. However, accelerating from a stop or during frequent stops and starts will drain the battery more quickly, especially for heavier riders.
It's worth noting that the effect of rider weight on speed and range can be mitigated to some extent by choosing an electric bicycle with a higher wattage motor. A higher wattage motor will be able to pull more weight more easily, resulting in faster acceleration and potentially higher top speeds, even with a heavier rider.
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Terrain type can impact how fast an e-bike can go
The speed of an electric bicycle is influenced by several factors, including the motor power, battery capacity, and terrain type. While electric bicycles can generally reach higher speeds than traditional bicycles, the specific terrain you are riding on will significantly impact your speed.
Electric bicycles are designed to handle diverse surfaces, from paved roads to rocky trails. However, the type of terrain you are riding on will affect your speed. For example, even the most capable electric mountain bikes may struggle to maintain speed on rough terrain with many rocks, roots, and drops. In contrast, you will likely experience faster speeds on smooth surfaces, such as paved roads or hard-packed dirt.
The impact of terrain on speed is also influenced by the class of electric bicycle you are riding. Electric bicycles are typically classified into three categories based on their motor power and speed capabilities. Class 1 and Class 2 electric bicycles are generally allowed on traditional bike paths and have lower top speeds than Class 3 bicycles. For instance, Class 1 and Class 2 bicycles provide pedal assistance up to 20 mph, while Class 3 bicycles can provide assistance up to 28 mph.
Additionally, the hill grade or incline of the terrain can also affect your speed. Steeper inclines require higher torque output from the motor, and a more powerful motor can help you navigate these slopes more easily. The battery capacity is crucial in maintaining consistent power delivery when riding uphill, so a higher-capacity battery can help you sustain your speed.
The weight of the electric bicycle and the rider can also influence speed. A heavier load can make it more challenging to accelerate and reach higher speeds, especially with a lower-wattage motor. Terrain that involves climbing hills or riding on rough surfaces will likely be more challenging with a heavier bicycle and rider.
In summary, while electric bicycles offer the advantage of motor assistance and higher speeds compared to traditional bicycles, the specific terrain you are riding on will significantly impact your speed. Factors such as the surface condition, hill grade, and the class and specifications of your bicycle will all contribute to the speed you can achieve on different types of terrain.
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E-bikes have different classes with varying speed capabilities
The speed of an electric bicycle depends on its class. E-bikes are categorized into three main classes, each with varying speed capabilities. The class of an e-bike determines the level of assistance provided by the motor, which in turn influences the bike's overall speed.
Class 1 E-bikes
Class 1 e-bikes are limited to a top speed of 20 miles per hour. These bikes provide pedal assistance, meaning the electric motor assists only when the rider is pedaling. In other words, you must pedal to use the motor, and once you reach 20 mph, the motor cuts off, and any additional speed comes from your pedaling. Class 1 e-bikes are allowed on bike paths and lanes shared with traditional, non-assisted bikes, and they usually don't require a driver's license.
Class 2 E-bikes
Class 2 e-bikes also have a maximum speed of 20 miles per hour. However, they differ from Class 1 in that they offer both pedal assistance and a throttle. The throttle allows you to engage the motor without pedaling, providing a boost even when you're not pedaling. Most Class 2 e-bikes also provide electrically assisted pedaling alongside the throttle. These bikes follow the same road rules as traditional bicycles and are typically allowed on roads with speed limits of 30 mph or less. They are also permitted on bike lanes and shared-use pathways.
Class 3 E-bikes
Class 3 e-bikes have a higher top speed of 28 miles per hour. These bikes provide pedal assistance, and the motor kicks in only when you're actively pedaling. The motor stops providing assistance at 28 mph, and any additional speed above that comes from your own pedaling. Class 3 e-bikes are considered the fastest "legal" electric bikes and are still classified as bicycles, so they generally don't require a driver's license or license plate. However, certain regions may have specific restrictions or requirements, such as wearing a helmet.
It's important to note that the implementation details and regulations for e-bike classes may vary from state to state and country to country. Some states have not yet formally classified e-bikes in their legislation, while others have specific rules regarding throttle usage, age restrictions, and helmet mandates. Therefore, it's essential to check the local laws and regulations before riding an e-bike.
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Frequently asked questions
The speed of an electric bicycle depends on several factors, including the weight of the bicycle and the rider, the power of the motor, and the terrain. On average, electric bicycles can travel between 15 to 20 mph (24 to 32 km/h). Some electric bicycles can reach higher speeds, exceeding 28 mph (45 km/h).
The fastest electric bicycle as of 2025 is the HPC Revolution X9, which has a top speed of around 104 km/h.
Electric bicycles have two types of assistance to provide speed: pedal assistance and throttle assistance. Pedal assistance provides power from the motor while the rider is pedalling, while throttle assistance provides a boost even when the rider is not pedalling. The level of assistance and top speed also depend on the class of the electric bicycle.
