SunTour RD-ED45-SSB, Edge 4050 (Accushift Plus)
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Category:  Rear Derailleurs
Name:  SunTour RD-ED45-SSB, Edge 4050 (Accushift Plus)
Brand:  SunTour
Primary Group:  Edge
Model:  RD-ED45-SSB
Years:  1989 - Early 1990's
Country:  Japan
Added By: JFischer on 07/13/07
Updated By: surplusruss on 08/29/12
Additional Photos - click for full size
SunTour RD-ED45-SSB, Edge 4050 (Accushift PluSunTour RD-ED45-SSB, Edge 4050 (Accushift PluSunTour RD-ED45-SSB, Edge 4050 (Accushift PluSunTour RD-ED45-SSB, Edge 4050 (Accushift Plu
Outer Plate MarkingsSunTour Accushift EdgeInner Plate Markings
MaterialAluminum AlloyDesign CategorySlant parallelogram
Attachment Bolt Size5mm Allen KeyCable Attachment Bolt Size5mm Allen Key
Shifting SystemsSunTour AccuShift
Friction
Cable AdjusterYes
Cage LengthMediumMax Cog Size28
Max Chain Wrap  
General Information
One of the later Accushift Plus derailleurs produced by SunTour during their race to catch up with Shimano in the indexed shifting race.  Spec states a max cog of 28t in friction mode, but only 24t when used in an indexed setup.  Apparently SunTour never did quite catch up to Shimano when it came to index technology.
Quality:Rarity:
 
 
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Component VariationsView Detailed List  Manage Variations
Variations of Component exist (Component is 1 of 2)BrandGroup
SunTour a-4050 AccushiftSunTour4050
Component Groups
Primary Group NameBrandQuick InfoBrowse Group Components
EdgeSunTourSport & RecreationView 8 Components
Brand Information(click to expand)

SunTour (Maeda)

SunTour derailleurs have a two-letter date code. On rear derailleurs the code is stamped on the back side of the inner parallel arm. On front derailleurs it is stamped on the back side of the inner cage.

The first letter represents the year. Larry Osborn and I believe O (Oh) is 1972, V is 1979 and A is 1984. As with Shimano, the second letter is the month code, where A is January and L is December.

SunTour Year Code

N
O
P
Q
R
S
T
U
V
W
X
Y
Z
1971
1972
1973
1974
1975
1976
1977
1978
1979
1980
1981
1982
1983
 
A
B
C
D
E
F
G
H
I
1984
1985
1986
1987
1988
1989
1990
1991
1992

SunTour Month Code

A
B
C
D
E
F
G
H
I
J
K
L
Jan
Feb
Mar
Apr
May
Jun
Jul
Aug
Sep
Oct
Nov
Dec

The earliest Suntour derailleur I have found with a code is marked OF. A rear derailleur marked OD (corresponding to April of 72) was reported by Leighton Walter. I have a bike that dates from between 1970 to 1972 that has the original SunTour derailleurs. These derailleurs do not have date codes on them, so I believe the coding started sometime between 1970 and April of 1972.

(source: vintage-trek.com)

 
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