Pedal-Assist Explained

Pedal-assist bikes are also known as pedelecs, and they are a popular type of electric bike fitted with an electric motor system designed to make biking easier, faster, and more enjoyable. 

If you primarily use your bike for commuting to work, running errands, or exploring the outdoors, having pedal-assist bikes can be a total game-changer.

We are exploring what pedal assist means, how it compares to throttle assist, how fast it can go, and what to know before buying your first pedal-assist bike.

What Exactly Is Pedal Assist?

Pedal assist is a feature on many electric bikes that helps you pedal by using a small electric motor. This system is activated when you pedal: the bike uses sensors to detect your pedaling motion and then adds extra power to make pedaling easier.

Depending on the e-bike, you can usually choose between 3 to 5 pedal assist levels, ranging from low (minimal help) to high (maximum motor support). 

Most modern ebikes and even electric tricycles have 5 levels of pedal assist. The Viribus BZ1 Step-Thru Electric Bike has a total of 5 pedal assist levels, assisting up to 60/70/80/90/100% of the max speed of 20 mph. 

With a 500W motor, a strong fork suspension system, and a 48V 13AH battery, you have over 25+miles of range for different rider weights and a variety of terrain.

• Level 1 might give you just a light push, ideal for flat roads or when you want a bit of a workout.
• Level 5 can make it feel like you have superhuman legs—perfect for steep hills or when you're tired.

It comes with racks and baskets, making it best for running errands and carrying around your groceries or personal items.

How Does Pedal Assist Work?

The pedal assist function is assisted by two types of sensors: the cadence sensors and the torque sensors. Pedal-assist bikes use one or both of these sensors.

• Cadence sensors detect if you’re pedaling, and the motor provides a steady amount of help, regardless of how hard you're pushing.
• Torque sensors measure how hard you’re pedaling. The harder you pedal, the more assistance the motor gives. This creates a smoother, more natural ride.

Higher-end bikes often use torque sensors, which offer a more intuitive experience. Many riders have said of pedal assist systems that it is almost like the bike is reading their minds.

Pedal Assist vs. Throttle Assist: What’s the Difference?

The main difference between pedal assist and throttle assist is that the former is not activated until the rider starts pedalling, and the latter can be activated at any time with a squeeze (or press) of the throttle grip. 

It is easy to confuse pedal assist with throttle assist, but they offer very different riding experiences.

Some modern electric bikes include both systems, so you can switch between them depending on how you feel. The Viribus Panther Electric Mountain Bike supports both a pedal assist and throttle system.

With a pedal assist system, you can ride up to 24 Mph, and throttle 20 Mph with the throttle, 24 Mph with the pedal-assist system.  With a 7-speed bike gear system, this mountain bike is ideal for off-roading and/ or mountain trails, and all types of adventurous riding. 

Want a workout? Use pedal assist. Tired or in traffic? Hit the throttle.

 How Fast Can You Go with Pedal Assist?

In the U.S., e-bike speeds are regulated by both federal and local laws. This means the maximum speed you can reach with pedal assist is not determined by how advanced the system is, but rather by the e-bike’s classification and the speed limits set by law.

Once you reach the speed limit for your bike’s class, the motor will stop providing assistance, but you can still pedal to go faster using your own effort

Based on their class, pedal-assist bikes usually fall into one of these categories:

Explore our detailed guide on how fast an e-bike can go. 

What Happens If You Pedal Without Assist?

All pedal-assist bikes can be ridden like normal bicycles when the motor is off or when the battery runs out. But there's a catch: they're heavier than regular bikes.

• Most e-bikes weigh between 40 to 70 pounds (18–32 kg).
• The extra weight comes from the battery, motor, and wiring.
• On flat terrain, pedaling without assist feels manageable—just a little more effort.
• On hills, it gets noticeably tougher, especially if the bike doesn’t have low gears.

That said, most e-bikes come with a good gear range, so even without power, you can still make it home. But it’s smart to plan your trips with the battery range in mind.

Final Thoughts

Pedal-assist bikes are the perfect blend of technology and tradition. They make biking more accessible—whether you're trying to get fit, replace your car for short trips, or just enjoy riding without burning out your legs.

With the right model, you’ll experience smoother climbs, faster commutes, and more fun on two wheels.

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