During a test ride on an e-bike, fatbike or electric cargo bike, you often notice it right away: one bike feels like it \u201cthinks with you,\u201d while the other sometimes responds a bit \u201con\/off.\u201d.<\/p>\n
In many cases, that noticeable difference is due to the type of sensor that controls the pedal assist.<\/p>\n
In this article, we explain the force sensor vs rotation sensor difference in a way that you will immediately recognize in your legs, your control and your riding feel.<\/p>\n
An electric bike does more than just \u201cturn on\u201d a motor.<\/p>\n
The engine has to assess how much help you need and how quickly it responds.<\/p>\n
In doing so, the sensor is the interpreter between your pedaling motion and the motor.<\/p>\n
In brief:<\/p>\n
That sounds small, but the effect is big.<\/p>\n
Especially in situations such as pulling away from an intersection, slowly maneuvering with luggage or driving in heavy city traffic.<\/p>\n
A rotation sensor (also called a cadence sensor) registers that you are pedaling.<\/p>\n
Often this works with magnets or a ring that counts pulses.<\/p>\n
The motor provides support as soon as the sensor \u201csees\u201d that the pedals are turning.<\/p>\n
With a rotation sensor, support is usually linked to the rate of pedaling around.<\/p>\n
You often feel a slight delay before the motor deploys because it takes a few pulses first.<\/p>\n
And when you stop pedaling, the support can sometimes \u201ccontinue\u201d for a very short time.<\/p>\n
Many riders describe it this way:<\/p>\n
A rotation sensor may be a great fit for those who ride mostly evenly.<\/p>\n
Think flat stretches, constant speed and little stop-and-go.<\/p>\n
It can also feel acceptable to pleasant for those who like to cycle at a higher pedal frequency.<\/p>\n
A force sensor (also called a torque sensor) measures how much force you apply.<\/p>\n
The harder you push, the more support the motor provides.<\/p>\n
If you pedal softly, the motor subtly helps.<\/p>\n
The main sensation is that the bike \u201cfeels like a regular bike, but with stronger legs.\u201d.<\/p>\n
You control the motor output with your feet, making the whole thing more intuitive.<\/p>\n
In crowded situations, that often gives more confidence.<\/p>\n
Typical characteristics that riders feel:<\/p>\n
With a force sensor, the logic is closer to how cycling normally works.<\/p>\n
On a non-electric bike, more pressure = more speed.<\/p>\n
With torque sensing, that connection remains, only your effort is amplified.<\/p>\n
The easiest way to compare sensors is to reenact concrete moments.<\/p>\n
When test driving, test not only a straight stretch, but also tight and slow situations.<\/p>\n
Here are six situations in which the difference is usually felt immediately.<\/p>\n
With a force sensor, you can achieve controlled \u201ctightening\u201d by applying a little more pressure.<\/p>\n
With a rotation sensor, sometimes the support may not come on until half a revolution.<\/p>\n
Or, on the other hand, firm commitment all at once, depending on setting and position.<\/p>\n
At low speed, you want to micro-dose.<\/p>\n
A force sensor then helps because small pressure also means small help.<\/p>\n
A rotation sensor can feel rather choppy or over-eager in this regard.<\/p>\n
In a turn, you often want to build up slowly.<\/p>\n
With torque sensing, the motor builds with your pedal pressure.<\/p>\n
With cadence sensing, you can sometimes get a \u201cpush\u201d as soon as the pedals go around again.<\/p>\n
At a threshold, you often pedal very differently: short pressure, then release.<\/p>\n
A force sensor immediately translates that into a small support pulse.<\/p>\n
A rotation sensor mainly looks to see if you are pedaling around, and therefore responds less finely.<\/p>\n
On a climb, you want extra pressure to help immediately.<\/p>\n
With a power sensor, it feels like you get \u201cextra power\u201d exactly when you ask for it.<\/p>\n
With a rotation sensor, you may have to mainly play with your pedaling pace to keep the bike awake.<\/p>\n
Extra weight makes control more important than pure speed.<\/p>\n
Therefore, many riders with cargo or child transport like to choose a system that is predictable and doseable.<\/p>\n
The force sensor vs rotation sensor difference then often feels like, \u201cfine move along\u201d versus \u201cpush in when the bike decides\u201d.<\/p>\n
There is no universal best choice.<\/p>\n
However, you can pretty clearly determine what better suits your rides and driving style.<\/p>\n
Use the quick choice guide below as a starting point.<\/p>\n
A few persistent ideas circulate around sensors.<\/p>\n
These cause people to pay attention to the wrong things during a test drive.<\/p>\n
These are the most important ones to set straight.<\/p>\n
Not necessarily.<\/p>\n
The tuning (software), engine response and brake interruptions also play a role.<\/p>\n
But it is true that a force sensor often doses more easily in tight situations.<\/p>\n
Precisely not.<\/p>\n
Because the support is proportional, it feels more relaxed and less \u201crushing\u201d for many recreational riders.<\/p>\n
You don't have to pedal hard; you just have to pedal consistently.<\/p>\n
In high support modes, differences sometimes become smaller, but they do not disappear.<\/p>\n
A force sensor usually remains more dosable.<\/p>\n
With a rotary sensor, the highest setting can actually enhance the \u2018on\/off\u2019 feeling.<\/p>\n
If you can only test drive for a short time, you can still get a good impression.<\/p>\n
The point is to seek variation in speed and pedaling power.<\/p>\n
Take this mini-test in about 10 minutes.<\/p>\n
With a rotation sensor, the input is mainly: \u201cturn the pedals.\u201d.<\/p>\n
The controller then selects a preset level of support, often tied to mode and sometimes to speed.<\/p>\n
So you get support based on activity, not strength.<\/p>\n
With a force sensor, the input is \u201chow many Newton meters or pressure is delivered.\u201d.<\/p>\n
The controller amplifies your input by a factor (e.g., 70%, 150% or 300% support depending on booth).<\/p>\n
That's why it feels like the bike is magnifying your legs instead of pushing you forward.<\/p>\n
More background on sensors and e-bike technology can also be found at Documents<\/a>.<\/p>\n The sensor type says little about \u201cbreaking down\u201d per se.<\/p>\n Reliability is mainly related to quality of components, sealing against moisture and proper assembly.<\/p>\n However, it is true that a more accurate sensor also requires neat adjustment and diagnosis in case of malfunctions.<\/p>\n Practically speaking, it pays to get maintenance and service right.<\/p>\n For that, a set route is nice, such as STOER Care<\/a>.<\/p>\n And if you want to make a warranty or report, you can do so through the warranty form<\/a>.<\/p>\n Whichever sensor you choose: on a legal e-bike in the Netherlands and the EU, the motor should support only when you pedal.<\/p>\n This is one of the key points that distinguishes an e-bike from a moped or scooter.<\/p>\n For the general definition and context, please visit Wikipedia on the electric bicycle<\/a>.<\/p>\nWhat does this mean for maintenance and reliability?<\/h2>\n
Rules: support may not be \u201cwithout steps\u201d<\/h2>\n
Conclusion: the palpable difference is all about control<\/h2>\n