Shimano RD-A520, Exage Motion  (Report Pending)
Main Photo
Category:  Rear Derailleurs
Name:  Shimano RD-A520, Exage Motion
Brand:  Shimano
Primary Group:  Exage Motion
Model:  RD-A520
Years:  1989
Country:  Japan
Weight:  275 grams
Added By: cinco on 11/02/07
Updated By: JFischer on 10/30/09
Additional Photos - click for full size
Shimano RD-A520, Exage MotionShimano RD-A520, Exage Motion
 Verify Component Photos
Outer Plate MarkingsExage MotionInner Plate MarkingsShimano VIA Japan {model number, date code}
MaterialAluminum Alloy; CompositDesign Category
Attachment Bolt SizeCable Attachment Bolt Size
Shifting SystemsShimano SIS
Shimano STI
Cable AdjusterYes
Cage LengthShortMax Cog Size28
Max Chain Wrap28T  
General Information
Inner and outer parallel plates are plastic over steel. Bushed guide pulley. Date code ML. Despite its name I've never seen it move.
Reported By:artiommatvei
Report Date:4/16/2019
Report Reason:Incorrect Content, the part name is RD-A250 not RD-520
Outstanding Report Submitted  
Additional Resources
Resources:Reference & ChartsCatalogs
Component Groups
Primary Group NameBrandQuick InfoBrowse Group Components
Exage MotionShimanoSport & RecreationView 6 Components
Details:   Not named in the 1990 data I have found, may have been replaced by 300EX or another of the EX lines.  Some part numbers lived on in the 300EX group.
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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