1. What is a Motorbike Gear Ratio Calculator?

Definition: This calculator computes the overall gear ratio of a motorbike by multiplying the primary and secondary gear ratios.

Purpose: It helps riders and mechanics understand the relationship between engine speed (RPM) and wheel speed.

2. How Does the Calculator Work?

The calculator uses the formula:

Where:

• \( GR \) — Overall gear ratio (unitless)
• \( Primary \) — Primary gear ratio (unitless)
• \( Secondary \) — Secondary gear ratio (unitless)

Explanation: The primary ratio (engine to transmission) is multiplied by the secondary ratio (transmission to wheel) to get the total reduction.

3. Importance of Gear Ratio Calculation

Details: Proper gear ratio understanding helps with performance tuning, acceleration vs top speed tradeoffs, and fuel efficiency.

4. Using the Calculator

Tips: Enter the primary ratio (typically 1.5-3.0) and secondary ratio (typically 2.5-5.0). All values must be > 0.

5. Frequently Asked Questions (FAQ)

Q1: What's a typical primary ratio?
A: Most bikes have primary ratios between 1.5 and 3.0, depending on engine design.

Q2: What affects the secondary ratio?
A: Sprocket sizes - larger rear sprocket or smaller front sprocket increases the ratio.

Q3: How does gear ratio affect performance?
A: Higher ratios (numerically larger) improve acceleration but reduce top speed.

Q4: Where can I find my bike's primary ratio?
A: Check your service manual or manufacturer specifications.

Q5: What's a good ratio for highway riding?
A: Lower ratios (numerically smaller) around 2.5-3.5 are better for high-speed cruising.