Shimano RD-AT12, ALTUS LT
Main Photo
Category:  Rear Derailleurs
Name:  Shimano RD-AT12, ALTUS LT
Brand:  Shimano
Primary Group:  ALTUS
Model:  RD-AT12
Years:  Late 1970's - Early 1980's
Country:  Japan
Weight:  258.5 grams (avg)
View Weight List
Added By: clint462002 on 03/25/10
Updated By: JFischer on 06/03/10
Additional Photos - click for full size
Shimano RD-AT12, ALTUS LTShimano RD-AT12, ALTUS LTShimano RD-AT12, ALTUS LTShimano RD-AT12, ALTUS LTShimano RD-AT12, ALTUS LTShimano RD-AT12, ALTUS LT
Outer Plate MarkingsALTUS LTInner Plate MarkingsNone
MaterialAluminum Alloy; SteelDesign CategoryInline parallelogram
Attachment Bolt Size5mm Allen KeyCable Attachment Bolt Size5mm Allen Key
Shifting SystemsFrictionCable AdjusterYes
Cage LengthShortMax Cog Size28
Max Chain Wrap  
General Information
Spec shows that 30T possible but "Use Shimano Products Only".  Also made in a long cage version which was model number RD-AT22.
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Additional Resources
Resources:Reference & ChartsCatalogs
Component Groups
Primary Group NameBrandQuick InfoBrowse Group Components
ALTUS / SELECTA SeriesShimano1978 - , RecreationView 6 Components
Details:   Introduced in 1978, updated in the 1981 Catalog.
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
255 GramsUnknown JFischer
262 GramsSpec JFischer
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