SunTour SL-4050, Edge
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Category:  Shifters
Name:  SunTour SL-4050, Edge
Brand:  SunTour
Primary Group:  Edge
Model:  SL-4050
Years:  Late 1980's
Country:  Japan
Added By: JFischer on 06/18/10
Updated By: JFischer on 06/18/10
Additional Photos - click for full size
SunTour SL-4050, EdgeSunTour SL-4050, Edge
Shifter Type DowntubeAttachment Style Downtube Braze-on (standard)
Shifting Systems6sp SunTour AccuShift
Friction
Lever MarkingsSunTour Accushift
Lever MaterialAluminum  
General Information
Take from eBay Auction: 
Suntour Edge (model SL-4050) shifters. This is a late 80's Accushift shifter set that has a right-side setting for 6-speed index or friction shifting. They are not high-end Suntour shifters, but still a good quality offering that was probably intended for Suntour sport/fitness drivetrains. The bright silver finish is nice and still shows as new (and please note the "Accushift" labeling on the right side shifter is just a decal...so if someone wanted to remove the labeling for a cleaner look, then this would be possible). 
 
One other note on the shifters...they will bolt onto down tube braze-on bosses without a problem and please note the adapters/spacers included with these shifters are sort of a hybrid design. They have a partial half-moon shape to them, so they will mount to a vintage steel down tube, which typically measure 28.6 mm in diameter. However, because these adapters/spacers also have a fairly significant flat profile that flanks each side of the curved (half-moon) profile, they will also mount onto an oversized (aluminum or equivalent) down tube, which typically has down tube shifter bosses with half-moon spacers/adapters already attached (as part of the bosses). The end result is these larger diameter composite frames will have down tube shifter bosses with a flattened profile at their mounting point (with the shifters). As a result, these hybrid-type shifter adapters/spacers are really capable of mounting on just about any type of down tube shifter boss, which is a very nice feature given that shifter adapaters/spacers can somtimes be a difficult find.
Quality:Rarity:
 
 
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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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