Electric bikes have pedals because pedals are what make them legally bicycles. Without functional pedals, an electric bike would be classified as a moped or motorized vehicle, requiring registration, insurance, and a license in most places. But the legal reason is only part of the story. Pedals also serve as the primary input mechanism for the motor, extend battery range, provide real exercise, and act as a backup when the battery dies.
Pedals Are a Legal Requirement
In the United States, all three classes of e-bikes require functional pedals. Class 1 e-bikes are pedal-assist only, with the motor cutting out at 20 mph. Class 2 e-bikes add a throttle that works without pedaling, but they still must have operable pedals and cap motor assist at 20 mph. Class 3 e-bikes provide pedal assistance up to 28 mph and may include a throttle limited to 20 mph. All three classes typically cap motor power at 750 watts.
The European Union is even stricter. The standard EPAC (electrically pedal-assisted cycle) definition across EU countries requires pedal assist only, with a 250-watt motor limit and assistance cutting off at 25 km/h (about 15.5 mph). Throttles are not allowed. In most EU countries, even having a throttle installed on the bike is enough to make it non-compliant, even if the throttle is disabled by software. Physical removal is the safest approach for meeting regulations.
Remove the pedals from an e-bike and it becomes something else entirely: a moped or electric motorcycle. That means you’d need a license plate, motor vehicle registration, liability insurance, and potentially a motorcycle license. You’d also lose access to bike lanes, bike paths, and multi-use trails. The pedals are essentially the legal passport that lets an e-bike go everywhere a regular bicycle can.
How Pedals Control the Motor
On most e-bikes, the pedals aren’t just decorative. They’re how the bike decides when and how much motor power to deliver. This happens through one of two sensor types built into the drivetrain.
A torque sensor measures how hard you’re pushing the pedals and scales the motor’s output to match. Push harder going uphill and the motor ramps up. Ease off on flat ground and it backs down. This creates a feeling that’s close to riding a regular bike, just with an invisible tailwind. Torque sensors tend to appear on higher-end e-bikes because of the more natural riding experience they provide.
A cadence sensor takes a simpler approach. It detects whether you’re pedaling and how fast your pedals are spinning (rotations per minute), then delivers a preset amount of power based on whatever assist level you’ve selected. Older cadence sensors used magnets to count each crank rotation. Newer ones use accelerometers for smoother, more responsive readings. Cadence sensors give a more on/off feeling compared to torque sensors, but they’re reliable and less expensive to manufacture.
Either way, your pedaling is the trigger. On a Class 1 or Class 3 e-bike, the motor literally won’t engage unless you’re turning the cranks.
Pedaling Extends Your Range
E-bike batteries hold a finite amount of energy. If you rely entirely on a throttle (on Class 2 bikes that allow it), the motor bears full responsibility for moving you and the bike forward, and the battery drains faster. When you pedal, you’re contributing your own energy to the equation. The motor does less work per mile, and the battery lasts longer.
The difference is significant in practice. On pedal assist, riders routinely cover 40 to 60 miles on a single charge depending on terrain, assist level, and battery size. On throttle alone, that range can shrink by half or more, since the motor is working continuously at higher output. For commuters and long-distance riders, pedaling isn’t optional if they want to make it home without recharging.
E-Bikes Still Give You a Real Workout
One common assumption is that e-bike pedals are just for show, that the motor does all the work. Metabolic research tells a different story. Physical activity intensity is measured in METs (metabolic equivalents), where 1 MET equals your energy expenditure at rest. Traditional cycling on varied terrain registers between 6.4 and 8.2 METs, which qualifies as vigorous exercise. E-bike riding on similar terrain falls between 4.1 and 6.1 METs, solidly in the moderate-to-vigorous range.
In one study, riders on e-bikes spent about 19 minutes in moderate-to-vigorous physical activity during a ride, compared to about 24 minutes on a conventional bike. That accounted for 95% of total cycling time for both bike types. The gap is real, but it’s not enormous. More importantly, researchers found that switching from a car commute to an e-bike commute significantly increases physical activity levels. People who wouldn’t ride a traditional bike due to hills, distance, or fitness limitations will ride an e-bike, and the pedaling they do on it counts.
Pedals as a Backup System
Batteries die. Chargers get forgotten. A flat battery 10 miles from home is a real scenario for any e-bike rider, and pedals are the difference between riding home slowly and pushing a 50-to-70-pound bike along the shoulder of the road.
How well an e-bike pedals without power depends on its motor type. Mid-drive motors (mounted at the cranks) and geared hub motors (in the wheel hub with an internal clutch) add minimal resistance when unpowered. You’ll feel the extra weight of the bike, but it pedals like a heavy traditional bicycle. Direct-drive hub motors, which lack an internal clutch, can create noticeable drag because the motor acts as a generator when you spin it without power. Some riders describe it as feeling like a stationary bike trainer.
E-bikes also tend to have fewer gears than traditional bikes, often 7 to 10 speeds, since the motor compensates for the missing low-end gearing during normal use. That’s fine with a charged battery. With a dead battery in hilly terrain, the lowest available gear may not be low enough for comfortable climbing. It’s rideable, but noticeably harder than a purpose-built road or mountain bike of similar weight.
Why Not Just Make Them Throttle-Only?
Some electric two-wheelers are throttle-only. They exist as mopeds, electric scooters, and electric motorcycles. The trade-off is that they fall into motor vehicle categories, with all the cost, licensing, and access restrictions that come along. E-bikes occupy a unique regulatory space precisely because they require human pedaling. That’s the bargain: keep the pedals, keep the bicycle classification, and keep access to infrastructure built for bikes.
For manufacturers, this also opens up a much larger customer base. Many cities are expanding bike lane networks, and e-bikes can use all of them. Mopeds and electric motorcycles are often banned from those same lanes. The pedals aren’t a design quirk or a relic from traditional bicycles. They’re the feature that defines the entire product category.