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Electric bike: Bosch or Yamaha motor, which one to choose?

Choosing the right electric bike is not always easy! But with so many motors available, the process has become even more complicated. Among the market leaders are Bosch and Yamaha.


One of the most frequently asked questions is what is the difference between these two engines.


Which engine has the most power? Which one is the most reliable? What are their characteristics? German or Japanese engine? Discover our comparison!


Bosch vs. Yamaha engine: key differences


Despite what you might think, the motors of the two brands are not so different. First of all, they are all integrated in the lower part of the frame, along with the bottom bracket. This makes for a natural and efficient riding feel.


The design

At a glance, you'll notice that Yamaha and Bosch motors are similar in shape and size. They are also compact.


Speeds

One of the most obvious visual differences is the size of the output sprocket. If you compare the Bosch engine to the Yamaha engine, you will notice that the output sprocket is much smaller on the Bosch engine. Why? Because it has an internally geared drive.


Small technical point: a ratio of 2.5 must be respected between the engine output sprocket and the rear cassette (for example if the transmission output sprocket has 12 teeth, then the cassette must have 30 teeth). The advantage? It's impossible for the chain to derail. It's really practical!


On the other hand, you'll notice that the Yamaha engine has a standard size ring gear and its drive is not internally geared. It has greater flexibility when shifting gears.


The sensors

Bosch and Yamaha use a 3-sensor system that continuously analyzes cadence, torque and speed.


It measures this data more than 1000 times per second. This allows the electric bicycle to be in phase with its user. The power output is as natural as possible.

The power

The power is the same: 250 Watts.


Driving modes

Bosch and Yamaha engines have different driving modes:

Bosch


Off: no assistance.


Eco: efficient and optimized assistance for maximum autonomy(the % of assistance depends on the Bosch system).


Tour: constant assistance over long distances. 


Sport: immediate and powerful assistance for sporty driving, both for MTB and for driving on the road(the % of assistance depends on the Bosch system.


Turbo: direct and maximum assistance at the highest cadences for ambitious and athletic rides(% assistance depends on Bosch system).

Yamaha


OFF: you can ride without electric assistance.


Eco+: the autonomy of the Eco+ mode will be approximately 30% higher than that of the Eco mode. 


Eco: saves energy for greater autonomy. Best used on a flat road.


Standard: satisfies both power and autonomy. Recommended for daily use.


HIGH: Provides constant and powerful assistance. Perfect for uphill riding.


The noise


The noise of the engine has an impact on the quality of the ride. The quieter it is, the more enjoyable it is (especially on the trails)!


Some engines whine, some squeal, while others whirr. When coasting downhill, they can make noise, from clattering to tapping.


Bosch motors, for example, emit a metallic clatter. It is very present on some models and barely noticeable on others.


On climbs, Yamaha engines have the most obvious whine (some call it a turkey sound) that fluctuates with effort.


So Bosch engines are easier to ignore than Yamaha engines.


The weight


Electric bike motors tend to decrease in size and weight while offering more power and torque.


Yamaha engines weigh between 2.8 kg and 3.4 kg, while Bosch engines weigh between 2.9 kg and 3.4 kg.


Summary and comparison table



Features


Power


Max. torque


Maximum support


Drive sprockets


Maximum weight


Bosch engine


250 W


85 Nm


340%


1


3 kg


Yamaha engine


250 W


85 Nm


208%


1 or 2


3,4 k


Bosch motors

The German manufacturer is known for its powerful and efficient engines. From its production lines comes a wide range of engines suitable for a wide variety of cyclists.


Whether commuters, mountain bikers, weekend cyclists or transporters, there is a Bosch motor for every electric bike user.


Active Line: for daily travel

electric bike scott motor bosch active line

The Active Line motor is perfect for short-distance rides around town. This engine is very compact and is appreciated by cyclists who appreciate elegant design.


The three strong points of this engine: it is extremely quiet, to take full advantage of its assistance up to 25 km/h, it is light (2.9 kg) and it has a back-pedaling function. The engine torque delivers 40 Nm. 

Active Line Plus: for adventure

Bosch Active Line Plus motorized electric bike

This German brand engine comes between the Bosch Active Line engine and the Performance Line engine.


You will love it! A great ally to explore new horizons during your EV rides. It allows spontaneous excursions and a range of activities. Like its little brother, it is quiet and compact.


As it weighs only 3.2 kg, it will offer you a smooth acceleration up to 25 km/h. Very maneuverable in all situations, the engine torque has a power of 50 Nm.

Cargo Line: to support heavy loads

The Cargo Line is one of the newest Bosch mid-drive engines. It benefits from some interesting improvements. To address a few shortcomings, Bosch has corrected its timing to make starting and driving slowly with heavy loads easier.


The peak power is an impressive 85 Nm, up from 75 Nm. Its maximum speed is 120 rpm, which makes the Bosch Cargo Line ideal for transporting goods (or children). As a touring bike, it is also very practical.


Loaded or unloaded, the powerful motorization of the VAE assists you up to 400% and ensures a controlled and instantaneous acceleration when starting. 

Performance Line: for athletes

Granville electric bike with Bosch Performance Line engine

The Bosch Performance Line has a lot of power under the hood... It's a great choice for riders who want to have some room to maneuver.


This versatile engine offers not only a powerful ride, but more importantly, sportiness. It propels you up the steepest of climbs or on athletic rides.


It can reach up to 75 Nm with 340% assistance.


Not to mention that it has a fully connected intelligent system: an eBike Flow application to track your activity, a wireless speed sensor, an eBike Lock function that serves as an anti-theft device, ABS and walking assistance. What more could you want?


Performance Line CX: for mountain hiking

Bosch Performance Line CX motorized electric bike

It's the perfect motor for those who want to go higher, faster, further! This compact and powerful motor can be found on a multitude of bikes. With 85 Nm of torque, a smart system and low weight, on paper it ticks all the boxes.


The strong point of the 2.79 kg motor is not only its power but its eMTB mode. This dynamic and progressive setting varies the level of assistance between Tour (140%) and Turbo (340%). For optimal handling and control!


No other engine makes climbing as simple and easy to master as the Bosch Performance Line CX. Shifting to 25 km/h is also effortless. Pedaling resistance? Not at all!


Comparison table of Bosch motors


Active Line

Active Line Plus

Cargo Line

Performance Line

Performance Line CX

Use

City

Long distance

City

Hiking

Mountain

Power

250 Watt

250 Watt

not filled in

250 Watt

350 Watt

Couple

40 Nm

50 Nm

85 Nm

75 Nm

85 Nm

Speed

25 km/h

25 km/h

25 km/h

25 km/h

25 km/h

Maximum support

250%

270%

400%

340%

340% 

Backpedaling

yes

yes

no

yes

no

How to use

Eco, Tour, Sport, Turbo

Eco, Tour, Sport, Turbo

Eco, Tour, eMTB, Turbo

Eco, Tour, eMTB, Turbo

Eco, Tour, eMTB, Turbo

Weight

2,9 kg

3,2 kg

2,9 kg

3,2 kg

2,9 kg

Why are Bosch electric bike motors so popular?

Bosch engines offer three essential elements: power, efficiency and excellent driving feel.


These features, combined with the wide range of motors available on the market, explain the popularity of Bosch motors: they are reliable and suitable for a wide variety of cyclists.


Some brands of bikes equipped with the Bosch engine

Bosch motors are used by a wide variety of electric bicycle brands.


From Cannondale à Moustache Bikesand from Trek to Canyon, dozens of the most famous brands use Bosch motors on their electric bikes.

Yamaha engines

Yamaha is a Japanese brand that has nothing to envy to Bosch. It has made its mark on the European market since the arrival of its PW engine.   

PWseries Te: an urban engine

Electric bike Gitane PWseries Te engine

This engine combines comfort and stability in urban environments. It easily handles steep climbs and strong winds.


The system uses four-sensor technology to automatically detect driving conditions such as hill starts. It provides appropriate assistance and smooth acceleration.


PWseries S2: less is more

Developed under the "less is more" philosophy, the PWseries S2 engine is significantly lighter and smaller than its predecessor, the PWseries ST, while offering more torque.


From daily commutes to country walks and mountain hikes, it's the ideal solution.


The maximum torque is 75 Nm. It is more than 7% higher than the PWseries ST, and its weight has been reduced to only 2.85 kg, 16% less than the previous model. These improvements make itone of the lightest in its class. It also boastsone of the best torque-to-weight ratios.


From an aesthetic standpoint, it offers Yamaha's partner bike manufacturers the opportunity to achieve a clean, minimalist look.


PW-X3: for off-roading

Yamaha claims to have developed the "lightest, smallest and highest torquedrive unitever". That's not entirely untrue!


Its performance speaks for itself: 85 Nm of torque, a weight of only 2.75 kg, "zero cadence" technology, 4 levels of assistance and a compactness 20% greater than its predecessor. No trail will hold any secrets for you!


A motor that you can find on the next generation of MTB electrics from the following brands HaibikeLapierre and Gas Gas.


PWseries CE: the quietest on the market 

It is a compact engine with intermediate transmission that delivers a torque of 50 Nm. Ideal for getting around town!


The brand claims its PWseries CE is the quietest motor it has ever product. You can use all the pedal-assist power available, without ever feeling guilty about making too much noise.


The ride is natural. The motor also has a walking assistance system. This is especially useful if you need to get around town with your bike. You won't feel like you're pushing a tank.


Yamaha Engine Comparison Chart 



PWseries S2

PW-X3

PWseries TE

PWseries CE

Use

Sport and Trail

Mountain bikes

Long distance

City

Power

250 W

250 W

250 W

250 W

Couple

75 Nm

85 Nm

60 Nm

50 Nm

Speed

25 km/h

25 km/h

25 km/h

25 km/h

How to use

Eco+, Eco, Standard, Off, High

Eco+, Eco, Standard, Expw, High

Eco+, Eco, Standard, High

Eco+, Eco, Standard, High, Automatic

Weight

2,85 kg

2,75 kg

3,4 kg

3 kg

Some brands of bikes equipped with the Yamaha engine

Like the Bosch engine, the Yamaha engine is used by many bicycle manufacturers.


You'll find it at Babboe, Gitane, Bixs, MBK, Lapierre and Haibike. The list is by no means exhaustive.

Conclusion

Bosch or Yamaha: which is the best engine?


Which engine looks more powerful?

The award goes to Bosch! 🏆


The Bosch Performance Line CX gives the impression of being the most powerful on the market. Especially with its intelligent eMTB mode, powerful motor and overtaking function. The power it delivers is addictive, consistent and adapts to the riders.


The harder you pedal, the harder the motor works. The assistance does not weaken with increases in cadence or power.


Tackling the climbs is a really enjoyable experience. You have a choice! You can ride slowly with little effort. Or you can pedal hard, expending more energy and getting to the top much faster.


Yamaha, on the other hand, has lower cadences. On the track, this makes the engine feisty and impatient. However, its new PW-X3 engine is a strong contender, with its Quad Sensor System feature. Keep an eye on it!


Which engine seems easier to control?

It will depend on your expectations!


If you're an aggressive or sporty rider, choose a Yamaha engine. You'll get a feeling similar to riding a motorcycle! From the moment you start, you'll have plenty of power. Very practical for uphill riding, less so in the long run!


However, the lack of progressiveness can make it feel clumsy. It is difficult to control wheel spin on the steepest and most technical slopes. Yamaha is not known for providing slow, progressive power.


In contrast, Bosch delivers progressive and linear power. It adapts to the cyclist's pedaling force, regardless of the mode. This means difficult starts on steep trails.

Verdict

Would you prefer a Bosch or a Yamaha motor for your electric bike?


Each system has its strengths and weaknesses. Don't buy a bike (only) based on the engine you use. Think more about your needs and how you will use it. There's no need to buy a Performance Line motor if you only ride downtown!


However, if you have to choose only one: the Bosch Performance Line CX. A little gem of power! Sports enthusiasts can also keep an eye on the Yamaha PW-X3, which will be fitted to certain models of MTB electric bikes in the coming months.