The internal diameter of a Fox DHX spring is typically 1.385 inches (approximately 35.18 mm). This standardized internal diameter ensures proper fitment over the shock body and shaft of Fox DHX and DHX2 coil shocks, allowing for correct operation and secure seating on the spring retainers.
While the internal diameter remains consistent for these springs, their overall length varies significantly depending on the specific shock's eye-to-eye measurement and stroke. This variation in length is critical to ensure the spring is compatible with the shock's travel and to prevent issues like coil bind at full compression.
Choosing the correct spring involves matching both the diameter and the appropriate length (or "Shortest TLG Spring That Fits") to your shock's specifications. The "TLG" (Total Line Gap) measurement indicates the minimum required spring length for a given shock stroke, preventing coil bind and ensuring the spring functions within its designed parameters.
To illustrate how spring length requirements differ based on shock dimensions, here is a breakdown for various Fox DHX2 shock configurations:
| Shock Eye-to-Eye | Shock Stroke | Shortest TLG Spring That Fits (Approximate Length) |
|---|---|---|
| 7.5 inches | 2 inches | 4.32 inches (109.7 mm) |
| 7.875 inches | 2 inches | 4.32 inches (109.7 mm) |
| 8.5 inches | 2.5 inches | 4.82 inches (122.4 mm) |
| 9.5 inches | 3 inches | 5.32 inches (135.1 mm) |
Understanding both the standard spring diameter and the necessary length for your specific shock is vital for maintaining optimal suspension performance and ensuring the longevity of your components.
