1. What is E-Bike Gearing Speed?

The E-Bike Gearing Speed calculation determines how fast an electric bicycle will travel based on wheel size, pedal cadence (RPM), and gear ratio. This helps cyclists optimize their gearing for desired speed and efficiency.

2. How Does the Calculator Work?

The calculator uses the e-bike speed formula:

Where:

• \( wheel\_circumference \) — Distance wheel travels in one revolution (meters)
• \( RPM \) — Pedal cadence in revolutions per minute
• \( gear\_ratio \) — Ratio of chainring teeth to cog teeth

Explanation: The formula calculates the linear speed by accounting for how far the bike moves with each pedal revolution, how fast you're pedaling, and the mechanical advantage of your gearing.

3. Importance of Speed Calculation

Details: Knowing your potential speed helps in selecting appropriate gear ratios for different terrains, optimizing battery usage, and maintaining comfortable pedaling cadence.

4. Using the Calculator

Tips: Measure your wheel circumference accurately (or use standard sizes: ~2.1m for 700c, ~2.05m for 27.5"). Typical RPM ranges are 60-90 for most cyclists. Gear ratio is chainring teeth divided by cog teeth.

5. Frequently Asked Questions (FAQ)

Q1: How does motor assist affect this calculation?
A: The formula calculates theoretical human-powered speed. Motor assist would provide additional speed beyond this calculation.

Q2: What's a typical gear ratio for e-bikes?
A: Common ratios range from 1.5 to 4.0, depending on bike type and intended use.

Q3: How do I measure wheel circumference?
A: Roll the bike one full revolution and measure distance traveled, or calculate using: π × wheel diameter.

Q4: Why is RPM important?
A: Maintaining optimal RPM (usually 70-90) improves efficiency and reduces fatigue on longer rides.

Q5: Does tire pressure affect the calculation?
A: Yes, significantly underinflated tires can reduce effective wheel circumference by 1-2%.