SunTour LD-2300, Cyclone Mk-II (Symmetric)
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Category:  Shifters
Name:  SunTour LD-2300, Cyclone Mk-II (Symmetric)
Brand:  SunTour
Primary Group:  Cyclone Mk-II
Model:  LD-2300
Years:  1981 - ?
Country:  Japan
Weight:  73 grams
Added By: JFischer on 10/12/07
Updated By: JFischer on 01/26/11
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SunTour LD-2300, Cyclone Mk-II (Symmetric)SunTour LD-2300, Cyclone Mk-II (Symmetric)SunTour LD-2300, Cyclone Mk-II (Symmetric)
Shifter Type DowntubeAttachment Style Downtube - Top Mount
Shifting SystemsFrictionLever Markings
Lever MaterialAluminum  
General Information

A short lived innovation from SunTour, the Symmetric shifters mounted to a single braze-on boss similar to a water bottle mount.  When the rear derailleur lever was moved, a cam on the inside of the shifter body also adjusted the trim on the front derailleur.  Contrary to what has been said about these shifters, the trim feature actually does (or at least should) work in BOTH directions.  There was a lengthy discussion of these shifter on BikeForums.net.

Quality:Rarity:
 
 
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Component VariationsView Detailed List  Manage Variations
Variations of Component exist (Component is 1 of 2)BrandGroup
SunTour Symmetric LD-2350 (Direct Mount)SunTour
Component Groups
Primary Group NameBrandQuick InfoBrowse Group Components
Cyclone Mk-IISunTour1981 - , Road RaceView 4 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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