How to Choose the Right Coil Spring Rate for Your Weight
By FOX Canada | Published: 2026-10-27
Category: Buying Guides
Learn how to select the correct coil spring rate for your weight and riding style, with practical rules for FOX DHX and DHX2 shocks.
Quick Answer
Choose a coil spring rate that matches your rider weight plus gear, aiming for about 30% sag on your FOX DHX or DHX2 shock. Start with the manufacturer's spring rate chart, then fine-tune based on your riding style and terrain.
Why Spring Rate Matters More Than You Think
The spring rate determines how much force it takes to compress your shock. If it's too soft, you'll bottom out on big hits and feel mushy through corners. If it's too stiff, you'll lose traction and comfort, and the shock won't use its full travel.
For FOX DHX and DHX2 shocks, the coil spring is a key part of the suspension setup. Getting the rate right ensures the shock works with your weight and riding style, not against it.
The Trade-Off: Comfort vs. Support
A softer spring gives a plusher ride and better small-bump compliance, but it may require more damping to prevent bottom-outs. A stiffer spring offers more support and pedaling efficiency, but it can feel harsh on rough trails.
Your choice should reflect where you ride and how aggressively you ride. If you're mostly on smooth trails, a softer rate might feel great. If you're hitting jumps and rocky descents, a stiffer rate will keep you in control.
Decision Rules for Choosing Your Spring Rate
- 1. Weigh Yourself with Gear: Put on your full riding kit—helmet, shoes, pack, and any armor. Use this total weight, not just your body weight, when referencing the spring rate chart. If you're between sizes, choose the heavier spring for more support.
- 2. Set Sag to 30%: With the shock pump, set your sag to about 30% of the shock's travel. Sit on the bike in your riding position, then measure the O-ring distance. Adjust the spring rate if the sag is too high or too low. If sag is above 35%, go up one spring rate; if below 25%, go down.
- 3. Adjust for Riding Style: For aggressive riding or big impacts, choose a slightly stiffer spring to avoid bottom-outs. For a plush, comfortable ride on smoother trails, a softer spring may be better. Use the rebound damping to fine-tune, but don't use it to compensate for a wrong spring rate.
Product Facts
- FOX Coil Spring: The FOX Coil Spring is an ultra-durable black powder-coated steel spring designed for FOX DHX and DHX2 shocks, available in multiple spring travel and spring weight configurations. This means you can match the spring weight to your rider weight and the spring travel to your shock's stroke, ensuring proper sag and performance.
FOX Coil Spring
Who Should Use This Guide
Best for
- Riders with FOX DHX or DHX2 shocks who want to improve their suspension setup
- Mountain bikers who are new to coil springs and need a straightforward way to pick a spring rate
Not for
- Riders using air shocks, since the adjustment process is different
- Those who already have a perfectly tuned suspension and don't need to change their spring
