ACROS AZ-66 Headset Lower Part | 1.5" | ZS66/40

The ACROS ZS66/40 headset lower part combines robust stainless steel angular contact ball bearings with well-designed gaskets. The result: long-lasting performance, minimal maintenance, and a more relaxed ride on your bicycle. For more information on compatibility, check out the headset finder on the ACROS website. Technical Specifications: - For 1.5" steerer tube (39.8 mm) - Insertion diameter (ID): 66 mm - Outer diameter (OD): 72 mm - Height: 3.6 mm - Press-fit depth: 10 mm Lower headset bearing pressed into a bearing cup with IPS gasket and crown race.