Shimano Dura-Ace EX - Last version
Main Photo
Category:  Rear Derailleurs
Name:  Shimano Dura-Ace EX - Last version
Brand:  Shimano
Primary Group:  Dura-Ace EX
Model:  RD-72??
Years:  1984 - 1985
Country:  Japan
Weight:  206 grams (Actual)
Added By: Peddie on 04/05/10
Updated By: zeitenwende on 06/08/14
Additional Photos - click for full size
Shimano Dura-Ace EX - Last versionShimano Dura-Ace EX - Last versionShimano Dura-Ace EX - Last versionShimano Dura-Ace EX - Last version
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Outer Plate MarkingsDura AceInner Plate MarkingsShimano Japan VIA
MaterialAluminum Alloy; SteelDesign CategoryInline parallelogram
Attachment Bolt Size6mm Allen KeyCable Attachment Bolt Size6 mm Allen Key
Shifting SystemsFrictionCable AdjusterYes
Cage LengthShortMax Cog Size26
Max Chain Wrap  
General Information
This is the final version of the Dura Ace EX rear derailleur. The main differences from the earlier ones:
-pivot and body bolt's sealing is different. There is no plastic ring, but O-ring.
-Different inner plate, and pulley cover.
-Cable attachment bolt and cable adjuster is free turning instead of the earlier versions, they had fixed turning bolts. 
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Additional Resources
Resources:Reference & ChartsCatalogs
Component Groups
Primary Group NameBrandQuick InfoBrowse Group Components
Dura-Ace EX, 7200 seriesShimano1978 - 1984, Road RaceView 32 Components
Details:   Also came in a 'Black' series early on (78-79 or so).  I do not see any mention of a black style in any of the 1980's catalogs of the 7200 series.
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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