1. What is the Rear Shock Spring Rate?

The rear shock spring rate (K) determines how stiff or soft your suspension is. It's calculated based on rider weight, desired sag percentage, and suspension travel to optimize bike performance and comfort.

2. How Does the Calculator Work?

The calculator uses the spring rate formula:

Where:

• \( K \) — Spring rate (N/mm)
• \( \text{Rider Weight} \) — Total weight of rider in kg
• \( \text{Sag Percentage} \) — Desired sag as percentage of travel
• \( \text{Travel} \) — Suspension travel in millimeters

Explanation: The formula calculates the spring stiffness needed to achieve your desired sag percentage based on your weight and bike's suspension travel.

3. Importance of Correct Spring Rate

Details: Proper spring rate ensures optimal suspension performance, improves traction, maintains geometry, and provides a comfortable ride. Too stiff and the bike won't absorb bumps; too soft and it may bottom out.

4. Using the Calculator

Tips: Enter your weight in kg (with riding gear), desired sag percentage (typically 25-35% for rear), and your bike's rear suspension travel in mm. All values must be positive numbers.

5. Frequently Asked Questions (FAQ)

Q1: What is a typical sag percentage?
A: For rear shocks, 25-35% is common. Cross-country bikes often use less sag (25-30%), while enduro/downhill bikes use more (30-35%).

Q2: Should I include gear weight?
A: Yes, your total riding weight (including gear, hydration pack, etc.) should be used for accurate calculations.

Q3: What if my calculated spring rate isn't available?
A: Choose the closest available spring rate. It's better to go slightly stiffer if between sizes.

Q4: Does this work for air shocks?
A: This calculator is designed for coil shocks. Air shocks use different pressure calculations.

Q5: How often should I recalculate?
A: Recalculate if your weight changes significantly or if you change bikes. Also consider seasonal adjustments for different riding conditions.