Fox Suspension SLS Spring

The SLS (Super Light Steel) spring uses a proprietary alloy that allows for a thinner wire diameter and fewer coils. This design significantly reduces weight, often bringing it close to the weight of titanium springs while maintaining the reliable, linear feel of steel.

Yes, the SLS spring features a 35mm inner diameter, making it compatible with a wide range of shocks from brands like Marzocchi, DVO, MRP, and X-Fusion, in addition to Fox coil shocks.

In most cases, you can use your existing spring retainers. However, always verify that your shock's stroke length and the spring's travel rating match to ensure proper fitment and prevent coil bind.

While titanium is lighter, it can be prone to fatigue over time. The SLS spring's proprietary steel alloy and specialized surface treatment are engineered specifically to resist fatigue and maintain a consistent spring rate for a longer service life.

Spring rate selection depends on your rider weight, bike leverage ratio, and personal preference for suspension feel. We recommend using a spring rate calculator specific to your bike frame's kinematics to find the correct weight for your setup.