: The percentage of shock travel compressed by the rider's static weight. Standard targets are usually 25% to 30% for trail/enduro and 30% to 40% for downhill. Calculation Methods
When buying a spring for your DHX2, you must understand Fox's specification labels. A typical marking looks like this: .
The Ultimate Fox DHX2 Spring Calculator & Setup Guide Choosing the correct coil spring rate for your or Fox Performance Elite DHX2 rear shock is the single most critical step to achieving optimal mountain bike performance. Unlike air shocks, which allow you to change stiffness with a shock pump, a coil shock requires swapping the physical spring to match your riding weight, frame geometry, and suspension kinematics. dhx2 spring calculator
Unlike older coil shocks, the DHX2 uses air volume spacers (red plastic pucks) to adjust the air spring curve.
The physical distance the shock shaft can travel (e.g., 57mm, 63mm, 65mm, 75mm). This is usually printed on the shock body. : The percentage of shock travel compressed by
Example: An 85kg rider with a 16kg bike and 4kg of gear/pack has a system weight of roughly 105kg.
Calculated by dividing Rear Wheel Travel by Shock Stroke. For example: A typical marking looks like this:
| Rider weight (lbs, geared) | Spring rate (lbs/in) | |----------------------------|----------------------| | 140–160 | 350–400 | | 160–180 | 400–450 | | 180–200 | 450–500 | | 200–220 | 500–550 | | 220–240 | 550–600 |
Never exceed (usually 2–3 turns past zero coil play). DHX2 is sensitive to coil bind.
Or in metric (kg/mm – less common for Fox): [ \textRate (kg/mm) = \frac\textRider weight (kg) \times \textLR^2\textShock stroke (mm) \times \textSag ]
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