1. What is a Bicycle Speed and Power Calculator?

Definition: This calculator estimates the power output required to maintain a certain cycling speed based on opposing forces.

Purpose: It helps cyclists, coaches, and engineers understand the relationship between speed, power, and various resistance forces.

2. How Does the Calculator Work?

The calculator uses the formula:

Where:

• \( P_w \) — Power output (watts)
• \( F_r \) — Rolling resistance force (N)
• \( F_d \) — Drag force (N)
• \( F_g \) — Gravity force (N)
• \( V \) — Velocity (m/s)

Explanation: The sum of all opposing forces is multiplied by the velocity to determine the required power output.

3. Importance of Power Calculation

Details: Understanding power requirements helps cyclists train effectively, engineers design better bikes, and commuters estimate energy needs.

4. Using the Calculator

Tips: Enter all force values in newtons (N) and velocity in meters per second (m/s). All values must be ≥ 0.

5. Frequently Asked Questions (FAQ)

Q1: How do I determine rolling resistance?
A: Rolling resistance depends on tire type, pressure, and surface. Typical values range from 5-15N for road bikes.

Q2: What affects drag force?
A: Drag depends on speed squared, rider position, and wind conditions. Aerodynamic bikes can reduce drag significantly.

Q3: When is gravity force important?
A: Gravity force matters most when cycling uphill. It's calculated as weight × grade (slope percentage).

Q4: How does power relate to speed?
A: Power requirements increase dramatically with speed due to the cubic relationship with air resistance.

Q5: What's a typical power output?
A: Recreational cyclists average 100-200W, while professionals can sustain 300-400W for extended periods.