Cycling Speed Power Calculator

Cycling Speed Equation:

\[ Speed (km/h) = \frac{Power (W)}{Weight (kg) \times Crr \times Slope factor} \times Constant \]

Power (W):

Weight (kg):

Crr (Rolling Resistance):

coefficient

Slope Factor:

factor

Constant:

unitless

Speed (km/h):

Unit Converter ▲

Unit Converter ▼

From:	To:

1. What is the Cycling Speed Power Calculator?

The Cycling Speed Power Calculator estimates cycling speed based on power output, rider weight, rolling resistance, slope conditions, and conversion constants. It helps cyclists understand the relationship between power input and resulting speed under various conditions.

2. How Does the Calculator Work?

The calculator uses the cycling speed equation:

\[ Speed (km/h) = \frac{Power (W)}{Weight (kg) \times Crr \times Slope factor} \times Constant \]

Where:

\( Power \) — Power output in watts (W)
\( Weight \) — Total weight including rider and bike in kilograms (kg)
\( Crr \) — Coefficient of rolling resistance (typically 0.004-0.008 for road bikes)
\( Slope factor \) — Multiplier for incline/decline (1.0 for flat terrain)
\( Constant \) — Conversion constant (typically 3.6 for km/h)

Explanation: The equation calculates how power translates to speed considering resistance factors and weight, providing realistic speed estimates for cycling performance.

3. Importance of Cycling Speed Calculation

Details: Understanding the power-to-speed relationship helps cyclists optimize training, plan race strategies, select appropriate gearing, and estimate performance under different conditions.

4. Using the Calculator

Tips: Enter power in watts, total weight in kg, rolling resistance coefficient, slope factor, and conversion constant. Typical Crr values: 0.004 for racing tires, 0.008 for mountain bike tires.

5. Frequently Asked Questions (FAQ)

Q1: What is typical rolling resistance for different tires?
A: Road racing tires: 0.004-0.005, touring tires: 0.005-0.007, mountain bike tires: 0.008-0.015.

Q2: How does slope factor affect speed?
A: Values >1.0 represent uphill (increased resistance), values <1.0 represent downhill (decreased resistance).

Q3: What power outputs are typical for cyclists?
A: Recreational: 100-200W, trained amateur: 200-300W, professional: 300-400W+.

Q4: Does this account for air resistance?
A: This simplified version focuses on rolling resistance. For accurate results, air resistance should be considered separately.

Q5: How accurate is this calculation?
A: Provides good estimates for steady-state cycling on consistent terrain. Real-world conditions may vary due to wind, drafting, and acceleration.