VeloBase.com - Component: Shimano RD-A551-GS, RX100

Shimano RD-A551-GS, RX100 (Report Pending)

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

Outer Plate Markings	Shimano RX100	Inner Plate Markings	RD-A551
Material	Aluminum Alloy	Design Category	Slant parallelogram
Attachment Bolt Size	5mm Allen Key	Cable Attachment Bolt Size	5mm Allen Key
Shifting Systems	Shimano SIS Shimano STI Friction	Cable Adjuster	Yes
Cage Length	Long	Max Cog Size	26
Max Chain Wrap	35T

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 (https://si.shimano.com/#/en/SI/52D0C) indicates a "total capacity" of 28T.

Quality:		Rarity:

Outstanding Report Submitted

Additional Resources
Resources:	Reference & Charts Catalogs

Component Variations	View Detailed List Manage Variations
Variations of Component exist (Component is 1 of 2)	Brand	Group
Shimano RD-A550, RX100	Shimano	RX100

Component Groups
Primary Group Name	Brand	Quick Info	Browse Group Components
RX100	Shimano	1990 - 1999, Sport & Recreation	View 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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