Shimano GB-100, Dura-Ace
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Category:  Bottom Brackets
Name:  Shimano GB-100, Dura-Ace
Brand:  Shimano
Primary Group:  Dura-Ace
Model:  GB-100
Years:  Early 1970's - ?
Country:  Japan
Weight:  269 grams (avg)
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Added By: JFischer on 11/04/09
Updated By: onespeedbiker on 06/22/14
Additional Photos - click for full size
Shimano GB-100, Dura-AceShimano GB-100, Dura-Ace
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Bearing Size/Count per side1/4" / 9x9Spindle MarkingsShimano 68=(W)=112 [Date Code]
Fixed Cup MarkingsShimano Japan [Threadig] [Date Code]Adjustable Cup MarkingsShimano Japan [Threadig] [Date Code]
Spindle StyleSquare Taper (JIS)Axle MaterialSteel
Available ThreadingsEnglish/ISO: 1.370 x 24;
French: 35mm x 1mm;
Italian: 36mm x 24
Length(s)
Tools NeededSpanner, Locknut Wrench and Fixed Cup Wrench  
General Information
 
Quality:Rarity:
 
 
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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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WeightSourceNotesAdded By
269 GramsActualw/o crank bolts Peddie
269 GramsActualw/o crank bolts Peddie
Campagnolo
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