ZTTO 4455ST Bicycle Headset
ZTTO code: Upper cup/Bearing outside diameter+ Lower cup/Bearing outside diameter + Fork tube (44 for OD ø44,55 for OD ø55,Sfor Straight Tube ,T for Tapered Tube fork) ZTTO code is for quick search,not a accurate specifications.Please refer to SHIS(Standard Headset Information System)ZS44/28.6ZS55/40(30)If you have any question about headset standard,Please google headset standard park tool or contact us MATERIAL: CNC MACHINED AL6061 T6SEALD BEARINGWEIGHT: About 126g