Shimano RD-1056-GS, 105SC  (Report Pending)
Main Photo
Category:  Rear Derailleurs
Name:  Shimano RD-1056-GS, 105SC
Brand:  Shimano
Primary Group:  105SC
Model:  RD-1056-GS
Years:  1993 - 1998
Country:  Japan
Weight:  246 grams (Actual),
short cage. BikePro catalog agrees.
Added By: JFischer on 08/02/09
Updated By: andris.82 on 08/19/13
Additional Photos - click for full size
Shimano RD-1056-GS, 105SCShimano RD-1056-GS, 105SCShimano RD-1056-GS, 105SCShimano RD-1056-GS, 105SCShimano RD-1056-GS, 105SCShimano RD-1056-GS, 105SCShimano RD-1056-GS, 105SCShimano RD-1056-GS, 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
Cable AdjusterYes
Cage LengthMediumMax Cog Size28
Max Chain Wrap28T  
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 (pictured).
Both of the short cage versions have a distinctive fully enclosed idler wheel cage.  The 1056 is subtly less rounded than the 1055.

Reported By:kpaul4
Report Date:4/17/2023
Report Reason:Incorrect Content,
Outstanding Report Submitted  
Additional Resources
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, 105SCShimano105SC
Component Groups
Primary Group NameBrandQuick InfoBrowse Group Components
105SCShimano1990 - 1999, Road RaceView 23 Components
Details:  in 1990 Shimano 105 was renamed to 105SC group. When the group received a makeover moving away from the polished aluminum finish to a painted silver finish. It would retain 7 Speed as it was introduced a year before with the 1051 group.  Dual pivot brakes were also introduced at the time. Before its demise in 1998 105SC would receive 8 Speed cassettes and STI shifters.

It was replaced with 9 Speed 105 (5500 Series) in 1999
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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