1. What is Brake Lever Ratio?

The Brake Lever Ratio, also known as Mechanical Advantage, is a measure of how much a brake lever amplifies the input force applied by the user. It determines the efficiency and feel of the braking system.

2. How Does the Calculator Work?

The calculator uses the Mechanical Advantage formula:

Where:

• \( Effort\ Arm \) — Distance from pivot to where force is applied (cm)
• \( Load\ Arm \) — Distance from pivot to where force is transmitted (cm)
• \( Mechanical\ Advantage \) — Force amplification factor (dimensionless)

Explanation: A higher mechanical advantage means less effort is needed to achieve the same braking force, but with longer lever travel.

3. Importance of Mechanical Advantage

Details: Proper mechanical advantage is crucial for optimal braking performance, affecting stopping power, modulation, and rider comfort. Different applications require different ratios.

4. Using the Calculator

Tips: Measure effort arm and load arm in centimeters. Both values must be positive numbers greater than zero for accurate calculation.

5. Frequently Asked Questions (FAQ)

Q1: What is a typical brake lever ratio?
A: Most bicycle brake levers have ratios between 3:1 and 5:1, depending on the brake system and intended use.

Q2: How does ratio affect braking feel?
A: Higher ratios provide more power with less hand force but require more lever travel. Lower ratios offer better modulation with more hand force.

Q3: Can I adjust my brake lever ratio?
A: Some brake systems allow ratio adjustment through different lever designs or adjustable pivot points, but most are fixed by design.

Q4: What ratio is best for disc brakes vs rim brakes?
A: Disc brakes typically work well with lower ratios (3:1-4:1) due to higher hydraulic pressure, while rim brakes often benefit from higher ratios (4:1-5:1).

Q5: Does cable stretch affect mechanical advantage?
A: Cable stretch doesn't change the theoretical mechanical advantage but can affect the effective braking performance and feel over time.