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Spring Rate Formula:
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The Spring Rate Calculator helps mountain bikers determine the appropriate spring rate for their suspension based on rider weight, desired sag percentage, and travel length. Proper spring rate is essential for optimal suspension performance and riding comfort.
The calculator uses the spring rate formula:
Where:
Explanation: The formula calculates the spring rate needed to achieve the desired sag percentage based on the rider's weight and suspension travel.
Details: Correct spring rate ensures optimal suspension performance, improves traction, maintains proper bike geometry, and provides a comfortable riding experience. Incorrect spring rates can lead to poor handling, reduced control, and potential damage to suspension components.
Tips: Enter rider weight (including riding gear) in pounds, desired sag percentage (typically 25-30% for rear suspension, 15-20% for fork), and suspension travel in inches. All values must be positive numbers.
Q1: What is sag and why is it important?
A: Sag is the amount your suspension compresses under your static weight. Proper sag ensures your suspension works optimally through its travel range and maintains correct bike geometry.
Q2: What's the difference between spring rate and air pressure?
A: Spring rate refers to coil spring stiffness (lb/in), while air pressure is for air shocks. This calculator is specifically for coil spring applications.
Q3: How does rider weight affect spring rate?
A: Heavier riders require stiffer springs to achieve the same sag percentage. The spring rate increases proportionally with rider weight.
Q4: Should I use different sag settings for different riding styles?
A: Yes, downhill riders often use more sag for better traction, while cross-country riders may use less sag for more efficient pedaling.
Q5: What if my calculated spring rate isn't available?
A: Choose the closest available spring rate. It's better to err on the slightly stiffer side if between options, as you can always add preload.