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| Category: | Rear Derailleurs |
| Name: | SunTour Cyclone M-II GT |
| Brand: | SunTour |
| Primary Group: | Cyclone Mk-II |
| Model: | RD-3700 |
| Years: | 1981 - ? |
| Country: | Japan |
| Weight: | 172 grams (avg)
View Weight List |
| Added By: | cinco on 11/04/07 |
| Updated By: | peterbman on 05/05/18 |
Additional Photos - click for full size |
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| Outer Plate Markings | Suntour Cyclone M-II | Inner Plate Markings | Maeda Ind. Japan {date code} |
| Material | Aluminum Alloy | Design Category | |
| Attachment Bolt Size | 6mm Allen Key | Cable Attachment Bolt Size | 4mm Allen Key |
| Shifting Systems | Friction | Cable Adjuster | No |
| Cage Length | Long | Max Cog Size | 34 |
| Max Chain Wrap | 34 | | |
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)
