Shimano RD-A550, RX100
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Category:  Rear Derailleurs
Name:  Shimano RD-A550, RX100
Brand:  Shimano
Primary Group:  RX100
Model:  RD-A550
Years:  1991 - 1994
Country:  Japan
Weight:  280 grams (Actual),
measured x3, accurate
Added By: JFischer on 04/22/09
Updated By: Simonius Titius on 10/20/11
Additional Photos - click for full size
Shimano RD-A550, RX100Shimano RD-A550, RX100Shimano RD-A550, RX100
Outer Plate MarkingsShimano RX100Inner Plate MarkingsShimano RD-A550
MaterialAluminum Alloy; SteelDesign 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 Wrap28T  
General Information

Made in both satin and polished finish versions.  Inner swing plate and both cage plates are steel.

This 7-speed model can be easily distinguished from the 8-speed RD-A551 by the same method as its 105 and 600 Ultegra brothers.  The cable clamp support is conical on the 7 speed, smoothed on the 8 speed.  There are many other subtle differences in geometry to cope with the extra width of the 8 speed cassette. 

Quality:Rarity:
 
 
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Resources:Reference & ChartsCatalogs
Component VariationsView Detailed List  Manage Variations
Variations of Component exist (Component is 1 of 2)BrandGroup
Shimano RD-A551-GS, RX100ShimanoRX100
Component Groups
Primary Group NameBrandQuick InfoBrowse Group Components
RX100Shimano1990 - 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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