pedal power

Fahrradfahren

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°)

Main part of the force
Activation of the quadriceps and gluteal muscles
Greatest performance contribution

2. Pulling phase (180°–360°)

Supporting function
Activation of hip flexors and hamstrings
Important for a smooth gait

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:

moderate to high cadence (80–95 rpm road bike)
controlled, even power output

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:

More pedal force = more motor assistance
Efficient pedaling = greater range
Even pressure = harmonious driving experience

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

Platform pedals
Clipless pedals

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:

Average performance
Top performance
Left/right relationship
Force curve during pedal cycle

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

Hill intervals
Low cadence (60–70 rpm) with high load
Sprint intervals

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:

Efficiency
aerodynamics
Endurance
Weight
Driving technique

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.

Schrader valve (car valve)

kilowatt hour (kWh)

Published: February 21, 2026 | Updated: February 21, 2026

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