Wolf Tooth ZS56/40 Lower Headset

ZS stands for Zero Stack, meaning the bearing cups sit inside the head tube rather than outside. The 56 refers to the 56mm inner diameter of your frame's head tube, and the 40 refers to the 40mm crown race diameter, which is standard for a 1.5-inch tapered steerer tube.

This headset is designed specifically for frames with a 56mm internal head tube diameter that use a 1.5-inch tapered steerer tube. You should verify your frame's specific headset standard or measure your head tube inner diameter before purchasing to ensure compatibility.

The custom-molded dual-lip seal is designed to create a tighter barrier against contaminants than standard seals. It effectively keeps grit, mud, and water out of the bearings, which significantly extends the lifespan of the headset when riding in harsh weather.

Yes, the design is fully serviceable. Wolf Tooth uses high-quality Enduro black oxide bearings that can be easily accessed and replaced, allowing you to maintain the headset's performance over the long term rather than replacing the entire unit.

Yes, the ZS56/40 lower assembly includes the necessary crown race. It is precision-machined to match the headset's specifications, ensuring a secure fit with your fork's steerer tube.