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| Category: | Front Derailleurs |
| Name: | SunTour ARx |
| Brand: | SunTour |
| Primary Group: | ARx |
| Model: | FD-2600 |
| Years: | Mid 1980's - Late 1980's |
| Country: | Japan |
| Weight: | 91 grams (Spec) |
| Added By: | JFischer on 10/12/07 |
| Updated By: | MGTS on 04/27/13 |
Additional Photos - click for full size |
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# Rings Designed For  | Double | Outer Plate Markings | SunTour ARx |
| Inner Plate Markings | Maeda Industries LTD Japan [date code] | Clamp Markings | SunTour |
| Inner Clamp Markings | | Design Category | Parallelogram |
| Pivot Arm Markings | None | Plate Material | Aluminum |
| Clamp Style | 28.6mm Clamp | Cable Attachment Bolt | 8mm Wrench |
| CableStop | No | Clamp Bolt Type | 8mm Wrench |
| Max Ring Difference | 18T | | |
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
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N |
O |
P |
Q |
R |
S |
T |
U |
V |
W |
X |
Y |
Z |
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1971 |
1972 |
1973 |
1974 |
1975 |
1976 |
1977 |
1978 |
1979 |
1980 |
1981 |
1982 |
1983 |
| |
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A |
B |
C |
D |
E |
F |
G |
H |
I |
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1984 |
1985 |
1986 |
1987 |
1988 |
1989 |
1990 |
1991 |
1992 |
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SunTour Month Code
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A |
B |
C |
D |
E |
F |
G |
H |
I |
J |
K |
L |
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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)
