1. What is the RPM Wheel Equation?

The RPM Wheel Equation calculates the rotational speed of a bicycle wheel based on crank RPM, chainring ratio, and sprocket ratio. It helps cyclists understand gear efficiency and speed performance.

2. How Does the Calculator Work?

The calculator uses the RPM Wheel equation:

Where:

• \( RPM_{crank} \) — Crank rotational speed (RPM)
• \( GR_{chain} \) — Chainring gear ratio
• \( GR_{rear} \) — Rear sprocket gear ratio

Explanation: The equation multiplies the crank speed by both gear ratios to determine the final wheel rotation speed.

3. Importance of RPM Calculation

Details: Calculating wheel RPM is essential for determining bicycle speed, optimizing gear selection, and understanding mechanical advantage in different riding conditions.

4. Using the Calculator

Tips: Enter crank RPM, chainring ratio, and sprocket ratio. All values must be positive numbers for accurate calculation.

5. Frequently Asked Questions (FAQ)

Q1: What is a typical crank RPM for cycling?
A: Most cyclists maintain 60-100 RPM, with 80-90 RPM being optimal for endurance riding.

Q2: How do I calculate gear ratios?
A: Chainring ratio = front chainring teeth / rear sprocket teeth. Multiple ratios can be calculated for different gear combinations.

Q3: Why is wheel RPM important?
A: Wheel RPM directly correlates to bicycle speed and helps in selecting appropriate gears for different terrains and riding conditions.

Q4: Does tire size affect the calculation?
A: This calculation gives rotational speed. For linear speed, you would need to multiply by wheel circumference.

Q5: Can this be used for electric bikes?
A: Yes, the same principle applies, though electric bikes may have additional motor assistance factors to consider.