To maximize the compatibility with different fork steerers, bikes and frames, the upper and lower parts of ACROS headsets are being offered separately in a great variety of dimensions.
The semi-integrated ACROS AZ-55 Headset Lower Part features the newest seal technologies from ACROS and high-end bearings in stainless quality for tapered forks and frames with a 55mm inner diameter headtube.
Precisely manufactured angular contact bearings made of stainless steel form the heart of the AZ-55 and offer play-free and smooth steering characteristics for a long time.
A sturdy vulcanized seal bonded to the compression ring and the base plate as an additional and first barrier against water and dirt.
In addition to the new vulcanized seal on the compression ring and the base plate, the sealing discs of the bearings now have a special v-groove double split lip (V-LIP). Furthermore, the V-LIP is recessed in a fine polished groove, which significantly increases the sealing effect once again.
The name ACROS AZ-55 describes the semi integrated (also known as press fit or zero stack) Ahead headset for tapered forks and frames with a 55mm inner diameter headtube. The S.H.I.S. denotation (see attachment) for the lower part offered here is ZS55/40 (with the 1.5" crown race).
Construction type (Ahead/Thread): Ahead
Cup skirt length in mm: 9
Included in delivery: 1x lower part of the headset, 1x 1.5" crown race
Material: Aluminium ||| Stainless Steel
Weight supplement: manufacturer information