This headset is designed for frames with a 44mm inner diameter on the upper head tube and a 55mm inner diameter on the lower head tube, with a 28.6mm steerer tube diameter for the upper part and a 40mm diameter for the lower part.

Like other Syncros headsets, the ZS44/28.6 - ZS55/40 headset is designed to provide smooth and precise steering for mountain bikes and road bikes. The upper and lower parts of the headset are pressed into the head tube of the frame and secured in place using spacers and a top cap.

As with any headset, it's important to ensure that the ZS44/28.6 - ZS55/40 headset is installed and adjusted correctly to ensure optimal performance and safety. Riders who are unsure about installation and adjustment should seek the assistance of a qualified bike mechanic.