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| Category: | Rear Derailleurs |
| Name: | SunTour X-1 |
| Brand: | SunTour |
| Primary Group: | X-1 |
| Model: | RD-X100 |
| Years: | 1990 - ? |
| Country: | Japan |
| Weight: | 316 grams (Spec) |
| Added By: | Tommy on 09/27/09 |
| Updated By: | Catnap on 01/25/11 |
Additional Photos - click for full size |
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| Outer Plate Markings | accushift plus | Inner Plate Markings | |
| Material | Steel | Design Category | Slant parallelogram |
| Attachment Bolt Size | | Cable Attachment Bolt Size | |
| Shifting Systems | SunTour AccuShift
Friction | Cable Adjuster | Yes |
| Cage Length | Long | Max Cog Size | 32 |
| Max Chain Wrap | | | |
| Component Groups |
| Primary Group Name | Brand | Quick Info | Browse Group Components |
| X-1 | SunTour | 1990 - 1993, Mountain Bike | View 3 Components |
| Details: A mid-level Mountain bike group by SunTour starting in 1990. |
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)
