Semi-integrated headset (ZS) for frames with a 56 mm lower head tube. The Acros ZS56 headset lower features a combination of stainless steel angular contact bearings and well-thought-out seals, ensuring durability with minimal maintenance, allowing for more carefree time in the saddle.

Headsets may be inconspicuous, but they are indispensable. In fact, a headset is more complex than it appears at first glance. Acros has spent years refining and contemplating the ZS56 headset so that you don’t have to: you can simply install it and enjoy long-lasting peace of mind. This is ensured by a double-sealed angular contact bearing made of stainless steel, filled with Acros optimized headset grease. The two sealing washers with double-lip seals keep the grease securely inside the industrial bearing, preventing moisture and dirt from entering. Thus, the Acros headset offers you long-lasting functionality, no matter what comes your way.

The ZS56 lower is completed with additional seals that prevent dirt and water from reaching the headset bearing at all. This guarantees long durability with minimal maintenance—so you can maximize and fully enjoy your time behind the handlebars. Zerostack designs are extremely popular, as they combine the advantages of low height and bearing cups.

Details:

• Double-sealed angular contact bearing
• Stainless steel bearings
• Headset base with vulcanized seal
• IPS - Internal Protection Sealing
• Press-fit diameter (ID): 56 mm
• Stainless steel industrial angular contact bearing, double-sealed
• CNC - made in Germany / Al2000 series

Technical specifications:

• Press-fit diameter (ID): 56 mm
• Outer diameter (OD): 62 mm
• Fork steerer diameter (SD): 1.5" (39.8 mm)
• Height (H): 2.8 mm
• Press-in depth (D): 10 mm
• Weight: approx. 56 g.