1. What is Final Drive Ratio?

The final drive ratio is the ratio between the number of teeth on the front sprocket and the rear sprocket of a motorcycle. It determines how many times the rear wheel turns for each rotation of the engine's output shaft.

2. How Does the Calculator Work?

The calculator uses the simple formula:

Where:

• Sprocket Front — Number of teeth on the front sprocket
• Sprocket Rear — Number of teeth on the rear sprocket

Explanation: A higher ratio means more torque but lower top speed, while a lower ratio means higher top speed but less acceleration.

3. Importance of Final Drive Ratio

Details: The final drive ratio significantly affects a motorcycle's performance characteristics including acceleration, top speed, and fuel efficiency. Choosing the right ratio is crucial for optimal performance based on riding style and conditions.

4. Using the Calculator

Tips: Enter the number of teeth for both front and rear sprockets. The values must be positive integers (typically between 10-20 for front and 30-50 for rear sprockets).

5. Frequently Asked Questions (FAQ)

Q1: What's a typical final drive ratio for motorcycles?
A: Most street bikes have ratios between 2.5 and 3.5, but this varies by bike type and intended use.

Q2: How does changing sprockets affect performance?
A: Increasing rear teeth or decreasing front teeth lowers the ratio for more acceleration. Decreasing rear teeth or increasing front teeth raises the ratio for higher top speed.

Q3: What's better for city riding?
A: Lower ratios (more acceleration) are generally better for stop-and-go city riding.

Q4: Does final drive ratio affect fuel economy?
A: Yes, higher ratios (taller gearing) generally improve highway fuel economy while lower ratios may reduce it.

Q5: How much can I change sprocket sizes?
A: Most bikes can accommodate ±2 teeth on the front or ±3-5 on the rear without chain length changes, but consult your manual.