Shimano RD-A551-GS, RX100  (Report Pending)
Main Photo
Category:  Rear Derailleurs
Name:  Shimano RD-A551-GS, RX100
Brand:  Shimano
Primary Group:  RX100
Model:  RD-A551-GS
Years:  1996 - ?
Country:  Japan
Added By: JFischer on 05/26/09
Updated By: Simonius Titius on 10/20/11
Additional Photos - click for full size
Shimano RD-A551-GS, RX100
Outer Plate MarkingsShimano RX100Inner Plate MarkingsRD-A551
MaterialAluminum AlloyDesign CategorySlant parallelogram
Attachment Bolt Size5mm Allen KeyCable Attachment Bolt Size5mm Allen Key
Shifting SystemsShimano SIS
Shimano STI
Cable AdjusterYes
Cage LengthLongMax Cog Size26
Max Chain Wrap35T  
General Information

Long cage version seen here was avaliable starting in the 1996 model year.  Standard cage version of the A551 was made in 1995.

RD-A550 was the 7-speed one.  RD-A551 had new geometry to handle the greater width of an 8 speed cassette.

BikePro gives for SS / GS versions:
Max rear sprocket  28T / 26T
Min rear sprocket   12T / 11T
Front difference      13T / 22T
Max chain wrap      22T / 35T

Reported By:etienne-lelouet
Report Date:9/17/2020
Report Reason:Incorrect Content, The document indicates a max chain wrap of 22T for the SS version of the derailleur, but official shimano documents ( indicates a "total capacity" of 28T.
Outstanding Report Submitted  
Additional Resources
Resources:Reference & ChartsCatalogs
Component VariationsView Detailed List  Manage Variations
Variations of Component exist (Component is 1 of 2)BrandGroup
Shimano RD-A550, RX100ShimanoRX100
Component Groups
Primary Group NameBrandQuick InfoBrowse Group Components
RX100Shimano1989 - 1999, Sport & RecreationView 14 Components
Details:   Shimano RX100 was designed to provide a feeling of both style and high performance to the affordable lightweight sport bike. Featuring advanced Shimano functions like SIS, HG sprockets and SLR brakes. RX100 gives the entry level road bike the potential for performance in the Shimano tradition. Optionally available in a striking pure white colour treatment. Shimano RX100 components make possible a fashionable sport bike that's as beautiful as it is affordable. 
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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