1. What is Motorcycle Gear Ratio?

The motorcycle gear ratio is the relationship between the number of teeth on two gears that are meshed or connected by a chain. It determines how many revolutions the output gear makes compared to the input gear.

2. How Does the Calculator Work?

The calculator uses the gear ratio formula:

Where:

• Primary — Primary drive ratio (crankshaft to clutch)
• Secondary — Secondary drive ratio (transmission output to rear wheel)
• Internal — Internal gearbox ratio for the selected gear

Explanation: The total gear ratio is the product of all three component ratios in the drivetrain.

3. Importance of Gear Ratio

Details: Gear ratio affects acceleration, top speed, fuel efficiency, and engine performance. Proper gearing matches engine power characteristics to intended use.

4. Using the Calculator

Tips: Enter all three ratio values (must be positive numbers). Primary and secondary ratios are typically fixed for a given motorcycle, while internal ratio changes with each gear.

5. Frequently Asked Questions (FAQ)

Q1: What's a typical primary ratio?
A: Most motorcycles have primary ratios between 1.5:1 to 2.0:1, reducing crankshaft speed before the transmission.

Q2: How does gear ratio affect performance?
A: Lower ratios (numerically higher) improve acceleration but reduce top speed. Higher ratios (numerically lower) improve top speed but reduce acceleration.

Q3: Where can I find my bike's gear ratios?
A: Check your owner's manual or manufacturer specifications. Internal ratios are often listed for each gear.

Q4: What's the difference between gear ratio and final drive ratio?
A: Final drive ratio typically refers to just the secondary ratio (sprockets or gears), while total gear ratio includes all components.

Q5: Can I change my gear ratios?
A: Secondary ratio can be modified by changing sprocket sizes. Primary and internal ratios are fixed by the manufacturer.