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Learn all about the motors of electric bikes


They exist several types of motors electric bike.

They are distinguished by their behaviour, their power, their specificity, their use.

Here is a descriptive practice that will help you better understand the differences.


The motors in the wheel

At the global level, the motors located in the wheels are no longer manufactured.

Simple, they are very common.

The engine of front wheel drive is distinguished by a great sensation

pulse at the start of the bike. It offers good acceleration

and allows to have an electric bike nervous and easily manageable

at a very attractive price.

Another interesting point, rear engines, even if it is not necessary to hope

miracles of these systems.

The wheel motor is very compact, with often a system that is " Brushless ",

without brushes to reduce friction, noise and heat.

The behavior of the motors of the front wheel is different in function

the manufacturer and models.

They are as reliable as the engines cranksets less expensive and

less complex to repair or change.

The motors in the wheel fit both for small and long journey.

It exists in all powers.

Some distributors and specialized journals opinions will push you to the

foster motors cranksets to justify a cost higher than the electric bike.

This is sometimes justified, because actually the bicycle pedals are more complex

technologically and therefore more expensive.


If you want a bike with coaster brake front engine

and engine crank are compatible.

The engine crank drives the chain and the gearbox.

As its power is added to that of your thighs it will cause them to wear

faster of these components, unlike the motors in the wheel

that relieves the transmission.

The torque that the engine crank can reach 70-90 Nm against 50-65 Nm

for a motor in the wheel. But the torque at the wheel is ultimately the same

in most cases, provided it be on the smallest report

with the engine crank.



The engines cranksets

The engines cranksets are now more sophisticated. A level

price higher than average, they offer assistance more gradual

All the manufacturers have

one or more models of cranksets.

They offer more options at the level of the consoles associated

but it's up to you if you really need it.

One of the advantages of the central engine is a certain consistency of the assistance,

a power booster is sufficient at a small pace, since this force made

by the engine is independent of the speed at which the wheel turns,

provided that when even having a regular pedal and agreement

with the assistance system. Such feature is favorable

a loaded bike without consuming too much energy. This maximum torque

is variable according to the drivers, and their settings.


How to calculate the power of an electric bike

Here are the parameters that come into play in determining

the autonomy of a bike. In fact, even if we were to compare the two bikes

exactly similar, one could have a battery life of 80 km and

the other would be barely 20 km before its battery drained completely.

The factors that determine the autonomy

To understand how to calculate the range of an electric bike,

it is necessary to have knowledge of four major parameters. In this section,

I'll explain in a clear and concise manner.

The capacity of the battery

The first, and probably the most obvious of the factors that influence

the battery range of an electric bike, it is the capacity of its battery.

This capacity is obtained by multiplying the intensity time of the battery (Ah)

with its voltage (V). Currently, a battery mid-range is 36V and 10Ah,

a total of 360 Watts/hour.

The higher the voltage and the intensity time of a battery, the higher it will be

autonomy (and the more it will be expensive, of course). In the table below,

here is a comparison between three batteries for the phantom with different abilities.

it is well known that the autonomy of the electric bicycle is directly

related to its battery capacity, at least if the engine used by the

of the three bikes dummy is the same. Of course, if the engine of the bike was more powerful,

it would consume

more electricity and hence the estimated range of the bike.

It is also noted that the price of a battery is strongly linked to its ability

Generally, the higher the battery size, the less the cost per Watt/hour is high.

So, 100 Watts/hour to 200 Watts/hour can lead to a difference

80€ approximately, while from 300 to 400 would cost fifty euros

more. The quality of a battery is also judged on the number of cycles


it can support. The higher it is, the better it is. In effect, while the charging of the

- battery has almost no cost (allow £ 1 per recharging about),

its depreciation is the biggest cost in an electric bike.

This is why, when your purchase, do not hesitate to choose a battery with :

  • A high-capacity
  • A large number of charge/discharge cycles

The battery will cost certainly more expensive to purchase, but it will make you big

cost savings in the long term. And in addition, you will have a better battery.

2 - Your weight

Yes, maybe you thought that the weight of the bike, as in the case

a classic bike,has a lot of influence on the effort to provide

when you pedal, and on the autonomy,

but it is not. In fact, it is mainly the weight of the rider influence

the autonomy of the bike.

It is logical, for where the difference between a bike that heavy and a light

is a dozen pounds approximately, that between a heavy rider and a light can be a


To illustrate more clearly the influence that the weight of the rider has on the autonomy,

we see that the capacity of the battery is the same for each person. However, more

their weight is, the higher the average battery life is reduced.

This phenomenon is even more felt when the path contains

many of the slopes and little dishes. In fact, in this situation, the engine will have to

compensate even more for the weight of the rider when the course is mainly


3 - electrical assistance

The third biggest factor in the battery range of an electric bike,

it is its electric assistance.

The electrical assistance, it is this that will determine to what extent

the engine of the bike is going to help you when you pedal. It can be set on different levels

in the function that we want to be much attended to or not.

It is obvious that the more the electric motor helps you, the more it should pump the electricity in the

battery. So, if you want to increase the life of your bike, keep a maximum

in the low levels of assistance and do not enable the highest levels that when you

really need (in steep slopes or when you are very tired, for example).

It is well known that between three electric bikes with battery capacity and

engine power equivalent, a person who uses an assistance level is low will have a more

high autonomy than the one that is greatly aided by its electric assistance.

It is also interesting to know that the engine power is high,

most of this reduction of autonomy is strong when one uses a high level of assistance.

The case of the bicycle with the accelerator

If your electric bicycle has a throttle, it is obvious that the more you use it, the faster you pump the electricity from your battery.

In effect, when you activate the accelerator, the engine is 100% about advancing your

bike and you will not help her any more, contrary to the pedalling assistance.

In comparison with 60 miles of range possible when using a level of assistance

low, this drastic reduction shows how much the battery is capable of doing

savings when it abstains to be strong helped by the engine.

What brand of motor to electric bike to choose ?

Of course, the specialty shops will all sell you the benefits

trademarks better known as Bosch, Yamaha, ...

Which are, of course, very good engine, but often more expensive.

Other brands, such as Bafang, Shimano have nothing to envy to the brands mentioned above

top. But they are more affordable, also reliable and powerful in function



The brand of electric bicycle Bosch

Bosch is one of the leading manufacturers of motors for electric bikes today.

They have developed a range of 4 engines to cover the best

different spectrums of use.

Active Line

This model has a weight and a reduced footprint with a torque of 40N.m.

The Active Line will be, therefore, particularly suitable for all electric bikes urban

the need to climb long hills or displacements forced with heavy

Performance Line

The engine Performance offers u n torque 63 N. m and a mode Tubo that will assist you up to

275% of your power. The other difference with the Active Line is that the Performance will you

attend as soon as the lowest rates of pedalling but also up to a rate of fire high

120 Rev/min.

The Performance Line will therefore be appropriate to the sporting cyclists and those who ride in

difficult conditions (steep slopes or charges).



This is the MTB version of the performance line. It offers a torque of 75 N. m.

It is the engine of the ATV to the athletes. he assists you up to 300% of your power. The

Performance Line CX you gives you a

With the mode emtb, it is the engine that calculates the assistance to be provided as a function of pressure

you put on the pedals : when the pressure is maximum, the engine will

you automatically switch to Turbo mode and return to the Sport mode when we do not have

most in need of the maximum power.

Choose a Performance CX for urban use, it is to drive in the city with a car

sport, it is not impossible but you need to know what to expect.


The brand of electric bike bafang

The range BAFANG is distinguished by its three types of engine : the engines to the wheel and the

central motor BBS01 integrate the sensor Speed, which activates the motor by the simple rotation

pedals, without asking the slightest effort to get the power. This type of sensor

is ideal if you want to use the bicycle as a means of transport without effort. On the other hand,

the central engine MAX DRIVE which mounts the sensor Torque, the latest generation is

able to develop up to 80 Nm of torque. All of the bikes have different levels

of assistance that allow to decide at every moment the intensity of the activity that one wants to



  • 30 Nm of torque developed about
  • Coupled to the sensor speed
  • Ideal for face without effort of slopes of up to 14-15%
  • This engine, the most comfortable of all, can reach 25 km/h even at the lowest levels of assistance, because, being independent of the pedals, it can reach the maximum speed without the need that there is a pressure on these latter.
  • Up to 80 Nm of torque developed
  • Mounts the sensor Speed
  • Ideal for climbing without the effort of slopes of up to 25%
  • The pedalling, very comfortable, this style is more sporty ; the engine is subject to the wheel through the chain and uses the reports of the speed change of the bicycle, which makes them feel very concretely the effect of traction.
  • This type of engine, which sits mid-way between the Torque and the system Speed, allows the user to decide the type of effort that he wants to accomplish through the different levels of assistance.


The engines of the range Bafang are associated to batteries of the lithium-ion Samsung, Panasonic or Sanyo which are a guarantee of durability and reliability in the time. The batteries take 4 to 6 hours to fully recharge.


  • This engine, among the most powerful on the market, develops up to 80 Nm of torque.
  • It is equipped with a sensor Torque, the latest generation, ideal for climbing without the effort of slopes of up to 25%.
  • The pedal, for sporty style, is more natural, because the engine responds to the pressure on the pedal as in the systems Shimano.
  • Associated with the battery 420 Wh, it ensures you a long life for your treks.



The brand of electric bicycle Yamaha

With the slogan, " Being one with the machine ", be at one with his machine, the 3rd

generation of Yamaha engine has concentrated all his energy and know-how on the

performance and comfort, whether it be for cyclists for the daily or the cyclo-


The new Quad Sensor System consists of 4 sensors can go even further

in the fluidity and the accompanying pedal.

The new engine PWseries offers YOU a choice of two consoles and a new battery :

Console Has (for " reachable ") : intuitive and compact

Console C (" connectivity ") : allows many functions to the level of connectivity.


In conclusion

Do not rely on the comparative, but you made your own idea of the electric bicycle, in

the trying of the specialty shops. Do not fall not into the trap of those that pushes the

consumers by putting brands in front at prices that often exceed the

2 500€.

you don't buy a Ferrrari to go and do her shopping at the market and if you have to carry

hardware or 4 children,

The future of cycling will also by the electric. Most brands develop

technologies always more advanced that make it the audience is always more discreet, such as a

simple extension of the movement of the cyclist : a minimum of vibration, aid almost

silent and sensations close to a pedaling natural.

It could be summed up in two words VAE today, and even more of tomorrow : power

and harmony.