Shimano RD-1056, 105SC
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Category:  Rear Derailleurs
Name:  Shimano RD-1056, 105SC
Brand:  Shimano
Primary Group:  105SC
Model:  RD-1056
Years:  1993 - 1998
Country:  Japan
Added By: JFischer on 01/03/11
Updated By: JFischer on 01/03/11
Additional Photos - click for full size
Shimano RD-1056, 105SC
Outer Plate MarkingsShimano 105Inner Plate MarkingsShimano RD-1056 VIA Japan
MaterialAluminum AlloyDesign CategorySlant parallelogram
Attachment Bolt Size5mm Allen KeyCable Attachment Bolt Size5mm Allen Key
Shifting SystemsShimano SIS
Shimano STI
Friction
Cable AdjusterYes
Cage LengthShortMax Cog Size28
Max Chain Wrap  
General Information

RD-1056 is the 8-speed replacement for the 7-speed RD-1055.   Unlike the 1055 it now has a medium cage option - see variation.
Both of the short cage versions have a distinctive fully enclosed idler wheel cage.  The 1056 is subtly less rounded than the 1055.

Quality:Rarity:
 
 
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Resources:Reference & ChartsCatalogs
Component VariationsView Detailed List  Manage Variations
Variations of Component exist (Component is 1 of 3)BrandGroup
Shimano RD-1055, 105SCShimano105SC
Shimano RD-1056-GS, 105SCShimano105SC
Component Groups
Primary Group NameBrandQuick InfoBrowse Group Components
105SCShimano1990 - 1999, Road RaceView 23 Components
Details:  Shimano 105 was renamed the 105SC group when 7speed was introduced to the line.  Dual pivot brakes were also added at this time. 
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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