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Shimano RD-L523, Light Action
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Category:  Rear Derailleurs
Name:  Shimano RD-L523, Light Action
Brand:  Shimano
Primary Group:  Light Action
Model:  RD-L523
Years:  1986 - 1988
Country:  Japan
Weight:  272 grams
Added By: cinco on 11/04/07
Updated By: JFischer on 05/09/10
Additional Photos - click for full size
Shimano RD-L523, Light ActionShimano RD-L523, Light Action
Outer Plate MarkingsShimano Light ActionInner Plate MarkingsShimano Japan {model number, date code}
MaterialSteelDesign CategorySlant parallelogram
Attachment Bolt Size6mm Allen KeyCable Attachment Bolt Size5mm Allen Key
Shifting SystemsShimano SIS
Shimano STI
Friction		Cable AdjusterYes
Cage LengthShortMax Cog Size28
Max Chain Wrap28T  
General Information
Date code JK. Another example has date code KC.  Another source shows this part being produced in 1988 (only data point).  Guessing these were introduced in the 86 model year, which would be a few years after the intro of SIS, perhaps time for Shimano to push the technology down into their lower priced line.
Quality:Rarity:
 
 
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Additional Resources
Resources:Reference & ChartsCatalogs
Component Groups
Primary Group NameBrandQuick InfoBrowse Group Components
Light ActionShimanoSport & RecreationView 12 Components
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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