Pedal force refers to the force that a rider transfers via the pedals to the crank of a bicycle or e-bike. It is the key factor for propulsion , as it is directly converted into torque at the crank and ultimately into driving force at the rear wheel.
In cycling, commuting or e-biking, pedal power significantly determines acceleration, speed, efficiency and energy consumption .
Physical principles of pedal force
Pedal force is a mechanical force that acts on the pedal either vertically or obliquely. The crucial factor is:
Force ( Newton ) – how hard you kick
Lever arm ( crank arm length ) – usually 165–175 mm
Cadence – revolutions per minute
Torque (Nm) – Force × Lever arm
Power (watts) – torque × angular velocity
👉 In simple terms: The higher the pedal force at the same cadence, the higher the torque generated – and therefore the power.
The unit commonly used in cycling to measure power output is watts , measured with a power meter .
Pedal force in the pedaling cycle
The pedal stroke consists of a 360° circle. The pedal force is not distributed constantly.
1. Pressure phase (0°–180°)
2. Pulling phase (180°–360°)
An efficient driver distributes the power as evenly as possible and avoids "dead spots" at 0° and 180°.
Pedal force vs. cadence
Many people mistake high pedal power for high speed. But the interplay between the two is crucial:
| High pedal force | High cadence |
|---|
| High muscle stimulus | Lower muscular strain per step |
| More effort required | Increased cardiovascular strain |
| Good for sprints & mountains | Good for endurance and efficiency |
The ideal combination is:
Pedal power on an e-bike
On an e-bike, a torque sensor measures the applied pedal force. The harder you pedal, the more assistance the motor provides (depending on the assistance level).
That means:
Especially with modern mid-motor systems, pedal force is the crucial control parameter for a natural riding feel.
Factors influencing pedal force
Several factors influence how much force is effectively transferred:
1. Muscle strength & training
Strength training (e.g. squats, lunges) increases the maximum possible pedal force.
2. Seating position
saddle height
crank length
Cleat position
Incorrect settings reduce power transmission and increase the risk of injury.
3. Pedal system
Clipless pedals allow for more efficient power transmission, as pulling forces can also be used.
4. Technology
A rounded tread improves mechanical efficiency and reduces energy losses.
Measurement of pedal force
Pedal force can be determined indirectly via power measurement systems:
Crank-based power meters
Pedal-based power meters
Hub-based systems
These devices measure torque and cadence and calculate the power in watts from this data.
For ambitious drivers, the analysis provides:
Pedal power comparison: Everyday bike vs. racing bike vs. e-bike
| Application | Typical pedal force | Characteristics |
|---|
| City traffic | Low to moderate | Evenly |
| Road bike sprint | Very high | Explosive |
| Mountain ascent | High | Constant |
| E-bike tour | Variable | Supports |
During a sprint, professionals can generate over 1500 watts for short periods – which means extremely high pedaling forces.
Training to improve pedal power
Those who want to increase their pedaling power can train specifically:
Strength training
Squats
Leg press
Deadlifts
Interval training on the bike
Technical training
One-legged drills
Cadence variations
Why pedal power isn't everything
High pedal power alone does not make a fast rider. The crucial factor is:
Especially in endurance sports, economical power output is more important than maximum power peaks.
Conclusion
Pedal force is the key mechanical parameter in cycling and e-bikes. It significantly determines:
acceleration
Climbing ability
Motor support
Training stimulus
Those who train their pedal power in a targeted manner and use it efficiently not only improve their performance, but also their riding experience and range.
