Shimano K-901, Dura-Ace
Main Photo
Category:  Headsets
Name:  Shimano K-901, Dura-Ace
Brand:  Shimano
Primary Group:  Dura-Ace
Model:  K-901
Years:  Early 1970's - Mid 1970's
Country:  Japan
Added By: Elev12K on 06/09/11
Updated By: MGTS on 01/18/16
Additional Photos - click for full size
Shimano K-901, Dura-AceShimano K-901, Dura-AceShimano K-901, Dura-AceShimano K-901, Dura-AceShimano K-901, Dura-Ace
 Verify Component Photos
Body MaterialSteelUpper Bearing Size3/16"
Lower Bearing Size3/16"Crown Race Size
Upper Cup MarkingsOne groove running around the cupLower Cup MarkingsOne groove running around the cup
Available Threading English/ISO/Italian (25.4mm x 24TPI)Stack Height 
General Information

Early variation of the 1st generation Dura-Ace headset

In chrome or black chrome

Not the 1st pick of weight weenies: 180gram sans bearings, on my kitchen scale

 K-901 is the first DA heaset, K-902 is the track version (as far as I can tell, the only difference is the lock on the track has no lettering)


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Additional Resources
Resources:Reference & ChartsCatalogs
Component Groups
Primary Group NameBrandQuick InfoBrowse Group Components
Dura-Ace, First GenerationShimano1973 - 1976, Road RaceView 34 Components
Details:   The introduction of Dura-Ace in the mid 1970's, along with the indroduction of the Shimano 600 group were Shimano's first attempts at a professional quality road racing component group.  The first Generation Dura-Ace was updated and renamed the 7100 series by around 1977/78.
Brand Information(click to expand)

Shimano Model Number Prefix List:

BB Bottom Bracket BL Brake Lever BR BRake
CB Coaster Brake CJ Cassette Joint CN ChaiN
CP Chain Protecto CR Chain Ring CS Cassette Sprockets
DF chain DeFlector DH Dynamo Hub FC Front Crank
FD Front Derailleur FE Fork Ends FH FreeHub
FS Front Suspension HB HuB HD HanDle bar
HP Head Parts (Head Set) HS Handle Stem IF Inter-3 Freehub
LP LamP MF Multi Freewheel PD PeDal
RD Rear Derailleur RH Rollerbrake Hub RM RiM
RR ReflectoRs RS Rear Suspension SB Shift Brake lever (Nexus, ?)
SC Speed Calculator (cycle computer) SF Single Freewheel Freilaufritzel SG Speed chanGe hub
SH SHoes SL Shift Lever Schalthebel SM SMall parts
SP Seat Post SQ Seat Quick release SS Single Sprocket
TL TooL WH WHeel ST Shift Brake Lever (STI, Rapid Fire, etc)
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