ACROS Blocklock 135° Headset - Tapered | ICR - ZS55/28.6 | ZS55/40

Semi-integrated headset (ZS) with steering stop and integrated cable gland. Fits Simplon bikes with 55mm head tube top and bottom. The ACROS Blocklock-ZS55 complete headset ensures that your top tube and down tube is protected from contact with the handlebar, attachments and the fork crown and the lines and cables are not overstressed in a crash. For forks with Tapered (1 1/8" - 1.5") steerer tube. Details of the ACROS Blocklock ICR headset press-in diameter / inner diameter (ID): 55 / 55 mm (upper part / lower part) outer diameter (OD): 61 / 63 mm (upper part / lower part) diameter steerer tube (SD): 1 1/8" ≙ 28.6 mm / 1 1/2" ≙ 39.8 mm (upper part / lower part) press-in depth (D): 9 / 10 mm (upper part / lower part) stack height (H): 12 / 6 mm (upper part / lower part) Blocklock steering stop (135°) integrated cable routing (ICR) stainless steel ball bearing double sealed angular contact ball bearing centering ring made of fiberglass reinforced plastic with vulcanized seal Due to the two sealing discs with double lip seal, the grease is held securely inside the industrial ball bearing and moisture and dirt can not penetrate into the bearing. So you get a long lasting function, no matter what. The ZS55 upper part is completed with other seals that prevent dirt and water can penetrate at all to the headset bearing. This guarantees a long durability despite minimal care - so you can maximize your time behind the handlebar and enjoy unrestricted. The Blocklock function also ensures that you do not have to worry about your top tube. It is safely protected from contact with handlebars and attachments and also the lines and cables can not be overstressed in the fall. So you have to do without barspins, but still have more than enough space for radical driving maneuvers!