SLS Coil Spring

What Our Gearhead® Experts Are Saying:

"The SLS Coil Spring is the upgrade I recommend to anyone running a DHX or DHX2 who hasn't yet addressed their spring selection. The Super Light Steel construction genuinely comes in lighter than titanium, and the proprietary stress relief process means the spring holds its rate under the kind of repeated high-load cycles that technical enduro terrain demands. Getting the rate dialed to your riding weight is the single biggest suspension improvement most riders haven't made yet, and the SLS range makes that process straightforward."

Coil suspension performance lives and dies with spring selection, and the material the spring is made from matters as much as the rate it's wound to. FOX's SLS Coil Spring starts with Super Light Steel, a material processed through a proprietary surface treatment and stress relief procedure that removes residual stresses from the spring structure. The result is a spring capable of withstanding higher stress loads than standard steel while using a smaller wire diameter and fewer coils, translating directly to reduced unsprung mass and more consistent, sensitive response across varied terrain.

The SLS construction comes in lighter than titanium while undercutting titanium's price point, making it the most performance-efficient spring option in the FOX lineup. The 35mm internal diameter fits FOX DHX and DHX2 rear shocks as intended and also opens compatibility to DVO, MRP, and X-Fusion platforms, broadening the application across a range of high-performance coil setups. Spring rates span a wide range to accommodate different rider weights and riding styles, and FOX's spring calculator provides a data-driven starting point for rate selection so setup time is spent tuning rather than guessing.

For riders building or upgrading a coil-sprung enduro or trail setup where unsprung weight, consistent spring rate, and long-term durability under repeated high-load cycles are the priorities, the SLS Coil Spring is the component the rest of the build is waiting for.