1. What is the Ebike Speed Formula?

The Ebike speed formula calculates the speed of an electric bicycle based on its voltage, motor RPM, and gear ratio. It helps estimate the theoretical maximum speed under ideal conditions.

2. How Does the Calculator Work?

The calculator uses the Ebike speed equation:

Where:

• \( Voltage \) — Battery voltage (V)
• \( RPM \) — Motor revolutions per minute
• \( Gear \) — Gear ratio (dimensionless)

Explanation: The speed is directly proportional to the voltage and RPM, and inversely proportional to the gear ratio.

3. Importance of Speed Calculation

Details: Calculating ebike speed helps in selecting appropriate components, understanding performance limits, and ensuring compliance with local speed regulations for electric bicycles.

4. Using the Calculator

Tips: Enter voltage in volts, RPM in revolutions per minute, and gear ratio (a dimensionless number typically between 1 and 10). All values must be positive numbers.

5. Frequently Asked Questions (FAQ)

Q1: Is this the actual speed I'll get on my ebike?
A: This calculates theoretical maximum speed. Actual speed may vary due to factors like rider weight, terrain, wind resistance, and battery condition.

Q2: What's a typical gear ratio for ebikes?
A: Most ebikes have gear ratios between 3:1 and 8:1, depending on motor type and intended use.

Q3: How does voltage affect speed?
A: Higher voltage systems generally allow for higher speeds, but must be matched with appropriate motor and controller.

Q4: What RPM range is typical for ebike motors?
A: Most hub motors operate between 200-500 RPM under load, while mid-drive motors may spin faster (2000-8000 RPM) before gear reduction.

Q5: Why is my actual speed lower than calculated?
A: Real-world factors like friction, air resistance, incline, and efficiency losses will reduce actual speed below theoretical maximum.