The E-Bike Throttle Control vs. Pedal Assist (PAS): Which is Right for You?

The real question is: Are you a “THROTTLER, ‘PEDALER,’ or BOTH?”

In order to answer that question, let’s begin by explaining the difference between “throttle-control” and “pedal-assist.” A throttle on an electric bike is the means by which you engage power from the motor. In other words, it is how you turn your power ON and OFF while riding. In most cases, it is accessed from the handlebar of your bike.

There are many different styles of throttle control, which we will discuss below. Conversely, a Pedal Assist Sensor, also known in the industry as a PAS, or Pedelec, is a mode that provides power only when you are pedaling. Here we will be discussing THROTTLE CONTROLS and PEDAL ASSIST SENSORS (PAS) and the marriage of all the above in our 500 Series (500W) E-Bike Kits as well as our Leisger and Magnum line of ebikes.

THROTTLE CONTROL

LEED’s 250 Series Electric Bike Kits offer one simple speed control: the push-button throttle which is a “throttle-control” style. This throttle allows for easy operation, a short learning curve, and a natural grip of the bicycle handlebar. See below.

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LEED’s Push-Button Throttle Available on the 250 Series E-Bike Kits

For an entry-level electric bike rider, the 250 Series is one of THE BEST OPTIONS hands down. The benefits of the push-button throttle include:

  1. Ease of Use. The push-button requires no special skills or knowledge of e-bike mechanics. You simply press the button when you wish to engage power from the motor, and it will be granted. Then, when the acceleration has reached a comfortable speed, you can easily let off the button and coast at the speed you desire. Or squeeze the grip throughout your entire ride and pass everyone on the road. It really is that simple!
  2. Simplicity in Installation & Maintenance. Since the push button comes as part of your e-bike motor cable, there are no additional wires to contend with, no complicated schematics for installation, and no additional components which become at risk for failure years down the road. This piece is so reliable, we offer a comprehensive warranty to back it up.
  3. Customizable Grip positioning. The little grey push button comes attached to a velcro strap which allows you to install it wherever is most comfortable for you and your bike. When I first installed mine, I placed it in a spot most easily reached by extending my index finger. But after multiple rides, I discovered that it was more comfortable for me to place the button where it would be under my palm, so that during extended rides I didn’t need to hold down the button. The mere pressure from my grip would activate the switch and I could ride without even realizing it was there! From customer feedback, I’ve learned most of our consumers prefer placing the throttle button under the first knuckle of the index finger. As seen in the image above.
  4. Safety. Many throttles available on our competitors’ kits have a switch where you can turn your kit “on” and leave it “on.” In our experience, we have found that these can be dangerous when the need arises to make a quick or emergency stop and you have left the motor on. These types of systems require braking to deactivate. Our push-button allows you to let off the power for braking at any time, without having to change any of the dials on a switch or alter programming on an LCD computer.
  5. Versatility. While we designed this piece as a way to give riders an additional “boost” while riding (as though a second rider were there pedaling along with you), we recognize that everyone has individual needs and preferences. The push-button allows you to engage the motor without doing any pedaling of your own, or you can pedal on your own and not utilize the motor at all (many pedal-assist systems will not allow this, once you pedal, the motor automatically kicks in), OR you can pedal AND enjoy the boost from the motor during the entire ride. There is something for everyone.

Now, obviously we think the 250 Series system is the best thing since sliced bread, but we recognize that there are some who would prefer another type of throttle system (particularly for mountain bikers or for high-speed bicycle commuters), so let’s talk about the cons of the push-button style unit.

The thing I hear most often from our customers who don’t prefer the push button is that they wish there was a way to control the speed at a lower level. For example, some of our baby boomers prefer cruising along at 8 miles per hour and would like the motor to hold consistently at that speed. While you can achieve this by simply letting off the button when the motor begins traveling at a rate of speed that is too high – coasting until your preferred speed is reached – this can be cumbersome for a few. There are a few options available on the market that would solve this issue, one being the Variable Speed Throttle, which we offer with our 500 Series (500W) 36 Volt Electric Bike Kits and on our Magnum Electric Bike Series.

VARIABLE SPEED THROTTLE-CONTROL

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The Variable speed throttle is not intended to operate with our 250 Series Conversion Kit, however, our newly designed 500w kit does have this feature as well as our Magnum and Leisger Electric Bikes. These systems are powered by pushing forward on the black throttle level protruding from the grip switch (see above image). In addition, the LCD computer has 5 power modes that you can switch between (see below image), giving you options on the amount of power being accessed from the motor.

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LEED 500 Series KM-SS LCD Computer (Velocity, Battery Power, Travel Time, 5 PAS Levels)

Our Leisger MD5 and other Magnum Electric Bikes available through our electric bike online store come standard with an LCD computer (see image below) which offers varying throttle control modes.

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LEED Electric Bikes LCD6 Console Available with our Magnum Line

Similar to our 250 Series Kits, other e-bike companies opt to use one of the push-button styles of throttle systems as well, which is similar to ours found in our 250 Series Line. Note the following examples:

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Clean Republic’s Push-Button Throttle – Credit: Clean Republic

 

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The BionX Push-Button Throttle (Red Button) on the OHM XS750

 

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eFlow E3 Nitro Twist Throttle (Not a Push-Button but Still on the Grip)

PEDAL ASSIST SENSORS (PAS)

The Pedal Assist mode was designed to make riding an e-bike mimic the natural motion you are used to feeling when riding a bicycle. As you pedal your bike and increase in speed, a sensor mounted on the bottom bracket or pedal crank arm is activated, which in turn generates power from the motor. The power is activated only when you pedal.

Many European countries have implemented laws requiring this type of system on all electric bikes because they force you to pedal when you are on a bike and keep your bike away from definitions of motor bikes. Due to these regulations, and an increasing demand from our bike commuters for pedal assist sensors, our new 500 Series E-Bike Kits come with an optional PAS installation system and our new Magnum and Leisger line of e-bikes also include pre-installed PAS on every bike.

 

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500 Series Tube Battery Kit with a Torque PAS

There are 2 different styles of Pedal Assist: cadence sensor or torque sensor. The most common is the cadence sensor. This is the type we offer on our 500 series kits as well as our Magnum and Leisger line of electric bikes. Cadence sensor systems usually come with a ring of magnets mounted on the pedal crank and a sensor fixed to the bottom bracket.

As you pedal, the sensor detects your cadence and increases the speed output from the motor accordingly. Our PAS comes with above industry standards with twelve magnets. This means that our kit is a rapid-response system turning the motor on immediately as the user begins the motion of pedaling. A PAS cadence system is installed on the pedal crank.

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Occasionally, riders have the issue that the speed a rider is pedaling doesn’t necessarily represent how much power he or she needs. On flat ground, faster pedaling usually means faster speed and thus more power needed. However, pedaling up a hill requires even MORE power, yet hill-pedaling speed is very slow due to the lower speed. The result is an ebike that can be under powered when climbing hills, negating perhaps the most important benefit of an ebike – hill climbing.

To combat the issue mentioned above, the torque sensor system was created. The torque sensor or torque PAS is usually mounted on either the pedal crank or near the rear dropout and measures torque or simply the movement of the pedal during normal pedaling. The amount of torque being applied may match the amount of power needed at any stage of bicycle pedaling, including acceleration, steady cruising and hill climbing.

This means that a torque PAS more accurately sensors the amount of power you need. The performance of the Torque Pedal Assist Sensors is often determined by the pressure applied to the chain.

While many have raved about the results they are seeing from these new torque sensored systems, we here at LEED (after a great deal of research and trial) have decided to stick with the more common and tested cadence system. We have found that experts in the e-bike industry are still happier with this choice as well. For example, here’s what Court Rye from Electric Bike Review (EBR) had to say on the subject:

“To be honest, I actually prefer pedelec [PAS] cadence sensing for commuting because you just don’t have to push all the time to get the motor going. Basically, you choose an assist level and that’s how hard strong the motor will go. It’s usually a percentage of full power so like [level] 1 is 25%, [level] 2 is 50% etc. and that powers the bike up to a certain speed and then you can keep pushing harder via the pedals to make the bike go faster and that lets you choose how hard you want to push. With torque sensing, there is a certain level of force you have to apply just to get it to activate (and this force changes from bike to bike).”

Source: http://electricbikereview.com/community/threads/which-do-you-prefer-cadence-or-torque-sensor.46/

Below are some examples of various Pedal Assist Sensors used by mainstream industry e-bike brands:

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The TMM4 Torque Sensor is located on the Rear Dropout of the Easy Motion Neo Jumper Electric Mountain Bike

 

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Cadence Sensor located on the Cranks of the Pedego City Commuter Electric Bike

 

So, while the PAS provide some distinct benefits, such as increased exercise and a more natural feeling during a bike ride, more and more we are hearing customers say they aren’t sure about it. Our friends at ebikeschool.com share this sentiment.

“Many people, including yours truly, find pedal assist systems frustrating and annoying. I don’t use my ebike for exercise. I have running shoes for that. When I’m on my ebike it’s because I have somewhere I’ve got to be. I’m heading to work, making a delivery, running an errand or doing something that means I’ve got to be moving. That’s not the time that I want to worry about pretending to pedal in order to trick my bike into working for me. I want a simple, responsive and fool-proof system that is going to power my bike exactly when and how much I want, and that’s what a hand throttle is for.”

We have many customers who like to use their e-bike kit motor only when they approach a hill that is difficult to climb on their own, or they simply have grown tired at some point on their bike ride. Not everyone wants to utilize the motor constantly. For these customers, everything but the PAS would be a better option.

We also hear from customers, who for various health reasons, are unable to pedal such as our wounded veterans, but they very much want to still be able to enjoy cycling with their friends and family. This is another situation when throttle control is optimal.

While we want our customers to have options available (and we strive to give you all the information you need to make your own decisions), we are pleased to be able to offer something for everyone.

If you prefer simplicity, ease of use and installation, and the best value, our 250w E-Bike Kit push-button throttle may be the best bet for you. If you need or want the option of controlling your speed at a lower rate, you want the option of using your motorized bike kit with or without a PAS, or you need a variable speed throttle, our 500w E-Bike Kit may be a better option as well as our Leisger and Magnum E-Bikes.

The great thing about the PAS and variable speed throttle on our 500w kit is that it is available, but not required to install. So you can choose whether or not you want to implement these optional features and alter their performance during your ride using your LCD Computer that comes standard with all 500 Series E-Bike Kits.

I hope this helps in understanding the different electric bike assist modes. Please contact us for any questions you may have 24/7 by email or M-F 9-5 MDT by phone at (866) 933-8716.

If you already have an electric bike, which mode do you prefer and why? We’d love to hear your experiences with and without a PAS. Send us an email to support@ebikemybike.com.

-Mandy W. (Customer Service Representative at Leed Bicycle Solutions)

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