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Bike Speed Equation:
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The bike speed watts equation (v = P/F) calculates a cyclist's speed based on power output and opposing force. This fundamental physics equation helps cyclists understand how their power translates to speed under different resistance conditions.
The calculator uses the basic physics equation:
Where:
Explanation: The equation shows that speed is directly proportional to power output and inversely proportional to the opposing forces like air resistance, rolling resistance, and gravity.
Details: Understanding this relationship helps cyclists optimize their training, select appropriate gear ratios, and estimate performance in different conditions. It's particularly useful for competitive cyclists and those training with power meters.
Tips: Enter your power output in watts and the total opposing force in newtons. Typical values might range from 100-400 watts for power and 5-50 newtons for force, depending on conditions.
Q1: How accurate is this calculation?
A: This provides a theoretical maximum speed. Real-world speed will be slightly less due to factors like wind, road conditions, and bike mechanical losses.
Q2: How do I estimate the opposing force?
A: Force can be measured with specialized equipment or estimated based on grade, wind speed, and rolling resistance coefficients.
Q3: What's a good power-to-speed ratio?
A: This varies greatly. Professional cyclists might maintain 40+ km/h (11+ m/s) at 300 watts on flat terrain, while recreational cyclists might achieve 30 km/h (8.3 m/s) at the same power.
Q4: Does this account for hills?
A: The force value should include the gravitational component when riding uphill (add mg·sinθ to the force calculation).
Q5: Can I use this for ebike calculations?
A: Yes, but remember to include both human and motor power in the P value for accurate results.