A standard e-bike in Poland provides assistance up to 25 km/h, has a motor with a continuous rated power of up to 250 W and only helps while you are pedalling. Once you pass 25 km/h, the motor should stop assisting, although the bike can still go faster under pedal power alone or on a descent. Under Polish law, the definition of a pedal-assisted bicycle includes, among other things, a voltage limit of up to 48 V, a continuous rated power of up to 250 W and a gradual cut-off of assistance above 25 km/h.
An e-bike’s speed doesn’t depend on the motor alone. Rider weight, terrain, tyre pressure, assistance level, battery capacity, wind and the bike’s technical condition all play a part.
What is the maximum speed of an e-bike?
The maximum assisted speed of a typical e-bike is 25 km/h. That doesn’t mean the bike can’t go faster, but above this value the motor should no longer help you accelerate. Your actual riding speed then depends on how hard you pedal, the gradient of the road, your weight, the tyres and the weather conditions.
It’s worth distinguishing between a few concepts: assisted speed, riding speed and maximum speed.
| Term | What it means |
|---|---|
| Assisted speed | The limit up to which the electric motor helps |
| Riding speed | The bike’s actual speed on the road |
| Maximum speed | The highest speed possible in the given conditions |
| Standard e-bike limit | Assistance up to 25 km/h and a motor of up to 250 W |
The most common mistake is treating 25 km/h as a physical lock on the bike. It doesn’t block the ride as a whole. It’s simply the limit at which the electric assistance stops working.
What determines an e-bike’s speed?
An e-bike’s speed depends on the motor’s power and torque, the controller settings, the rider’s weight, the type of terrain, tyre pressure, the assistance level, aerodynamics and the state of the battery. The same e-bike can behave differently on a flat road, uphill, with a heavier rider or with a low battery charge.
The key factors affecting an e-bike’s speed:
| Factor | Effect on speed |
|---|---|
| Motor power | Affects acceleration and holding speed under load |
| Torque | Helps when setting off and on climbs |
| Rider weight | More weight worsens acceleration and increases energy consumption |
| Terrain | Climbs reduce speed and shorten range |
| Tyres | Low pressure increases rolling resistance |
| Battery | A low battery level can limit the drive’s performance |
| Wind | Air resistance increases with speed |
| Assistance mode | A higher mode gives more help but drains the battery faster |
In real-world riding, the difference between bikes often isn’t about which one goes faster on a flat stretch. What matters more is which one sets off more easily, climbs better and keeps delivering stable assistance for longer.
How does motor power affect speed?
Motor power mainly affects acceleration, climbing and holding speed under load. On a road-legal e-bike, a more powerful motor shouldn’t mean a higher assisted speed, because the limit stays at 25 km/h.
A 250 W motor can be enough for city riding, leisure rides and commuting. Extra power is most noticeable when:
- setting off at traffic lights,
- riding uphill,
- carrying luggage,
- riding with a heavier rider,
- using cargo and transport bikes,
- tackling more demanding terrain.
The wattage figure alone doesn’t tell the whole story. Two motors of similar power can perform differently if they differ in torque, controller, battery and the way they deliver power.
What regulations limit the speed of an e-bike?
For an e-bike to be treated as an ordinary bicycle, it should have a motor with a continuous rated power of up to 250 W, assist only while you are pedalling and cut off assistance at 25 km/h. The Polish definition of a bicycle with an electric pedal-assist drive also includes a supply voltage limit of up to 48 V.
The key figures for a standard e-bike:
| Parameter | Value |
|---|---|
| Maximum assisted speed | 25 km/h |
| Continuous rated motor power | up to 250 W |
| Maximum supply voltage | up to 48 V |
| How it works | assistance while pedalling |
| Above the limit | gradual cut-off of assistance |
This means a road-legal e-bike shouldn’t work like a scooter with a throttle that moves without pedalling. The drive is meant to help the cyclist, not to replace pedalling altogether.
Is removing the speed limiter legal?
Removing the speed limiter can mean your e-bike no longer meets the conditions for an ordinary bicycle. That brings the risk of losing your warranty, problems with insurance, greater liability after a collision and potential legal consequences when riding on public roads.
The biggest risks of removing the limiter are:
- exceeding the assistance limit,
- losing the manufacturer’s warranty,
- faster wear of the motor and battery,
- greater strain on the brakes,
- insurance problems after an accident,
- the vehicle potentially being classed as something other than a bicycle.
Can you convert an ordinary bike into an e-bike?
An ordinary bike can be converted into an e-bike by fitting a motor, battery, controller, pedal sensor and control panel. The most important thing, however, is choosing a kit that suits the frame, the brakes, the weight of the bike and the legal limits. The conversion itself shouldn’t turn the bike into a vehicle that exceeds the parameters of a standard e-bike.
A conversion makes sense when the frame is in good condition, the bike has suitable geometry and the brakes can cope with the extra weight and livelier performance. Not every old bike is a good candidate for electrification.
What do you need to convert a bike to electric?
Converting a bike to electric requires a motor, battery, controller, pedal sensor, cables, mounts and a control panel. In practice, you also need to check the brakes, the condition of the frame and the permitted load, because after the conversion the bike will be heavier and quicker to accelerate.
Frequently asked questions about e-bike speed
A standard e-bike provides assistance up to 25 km/h. Above this speed the motor should stop helping, but the bike can go faster under the rider’s own pedal power or on a descent.
An ordinary e-bike shouldn’t provide assistance up to 50 km/h. Speeds like that apply to speed pedelecs, tuned vehicles or designs that may not be treated as a standard e-bike.
A 500 W motor exceeds the standard power limit for a conventional e-bike. Before using such a vehicle on public roads, you need to check its legal status, technical requirements and the rules for road approval.
The speed limiter restricts motor assistance to a set limit, usually 25 km/h. It doesn’t stop the bike; it simply cuts off the electric drive’s help once the set speed is exceeded.
Yes, some e-bikes may limit performance when the battery is low. A drop in voltage and battery protection can make the assistance weaker and the bike slower to accelerate.
A bigger battery usually increases range rather than the assisted speed limit itself. It can, however, help the drive keep working steadily for longer, especially on longer routes, climbs and in a higher assistance mode.
