Shimano Dura-Ace Low Flange First Gen
Main Photo
Category:  Hubs
Name:  Shimano Dura-Ace Low Flange First Gen
Brand:  Shimano
Primary Group:  Dura-Ace
Model:  HS-731 / HS-831
Years:  1973 - 1977
Country:  Japan
Weight:  510 grams
Added By: JFischer on 07/19/07
Updated By: Concor on 06/03/12
Additional Photos - click for full size
Shimano Dura-Ace Low Flange First Gen Shimano Dura-Ace Low Flange First Gen Shimano Dura-Ace Low Flange First Gen Shimano Dura-Ace Low Flange First Gen Shimano Dura-Ace Low Flange First Gen Shimano Dura-Ace Low Flange First Gen Shimano Dura-Ace Low Flange First Gen Shimano Dura-Ace Low Flange First Gen
Gear Compatibility FreewheelFront Bearing Size/Count3/16" /11x11
Rear Bearing Size/Count1/4" / 9x9Rear Spacing120mm
Spoke Drilling28; 32; 36Flange SizeLow Flange
Gear Threading/Pattern English/ISO: 1.375 x 24 TPIBody MarkingsShimano logo
Axle MaterialSteelShell MaterialAluminum
General Information
Low Flange version of the First Generation Dura-Ace hubs.  Front model number: HS-731, rear model number HS-831.  Rear hub made for 5-speed freewheels.  Front: 220g, Rear 290g (from catalog)

pressed-in hub races (cups) appear to be same dimensions as Campagnolo Nuovo Record, so probably interchangeable,
although Campagnolo spec'd different size balls in front hubs (7/32" v. 3/16")
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Additional Resources
Resources:Reference & ChartsCatalogs
Component VariationsView Detailed List  Manage Variations
Variations of Component exist (Component is 1 of 3)BrandGroup
Shimano Dura-Ace High Flange First Gen (Black)ShimanoDura-Ace
Shimano Dura-Ace High Flange First GenShimanoDura-Ace
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)

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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