Fox Suspension SLS Coil Spring

The SLS (Super Light Steel) spring uses a proprietary alloy that allows for a smaller wire diameter and fewer coils. This design significantly reduces weight, bringing it much closer to the performance and feel of a titanium spring while maintaining the reliability of steel.

Yes, this spring is compatible with a variety of coil shocks including Marzocchi, DVO, MRP, and X-Fusion, provided they accept a 35mm inner diameter spring. Always verify your specific shock's stroke length and spring rate requirements before purchasing.

The surface treatment is a stress-relieving process designed to increase the fatigue life of the metal. It helps the spring resist wear and maintain its consistent spring rate over long periods of aggressive riding.

Generally, you should match the spring stroke to your shock's stroke. Using a spring with a longer stroke than your shock is technically possible if the physical dimensions fit, but it is not recommended as it can lead to coil bind or improper fitment.

The weight reduction primarily helps with unsprung mass, which can make your suspension feel slightly more responsive and sensitive to small bumps. However, the spring rate itself remains the primary factor in how the bike handles impacts.