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Shimano K-901, Dura-Ace
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Main Photo
Photo Credit: VeloBase User elev12k
verified Verified 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)

 
Quality:Very Good, 4.00/5 (1 vote)Rarity:Rare, 4.00/5 (1 vote)
   
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Additional Resources
Marketplace:Looking to buy one of these?Sell one like this
Resources:Reference & ChartsCatalogs
Component Groups
Primary Group NameBrandQuick InfoBrowse Group Components
Dura-Ace, First GenerationShimano1973 - 1976, Road RaceView 35 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)
 
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