Simplex Super LJ 503 (triple; first version)
Main Photo
Category:  Front Derailleurs
Name:  Simplex Super LJ 503 (triple; first version)
Brand:  Simplex
Primary Group:  Super LJ
Model:  Super LJ 503
Years:  N/A
Country:  France
Added By: nprenet on 11/28/07
Updated By: peterbman on 05/21/15
Additional Photos - click for full size
Simplex Super LJ 503 (triple; first version)
# Rings Designed For DoubleOuter Plate MarkingsS in star
Inner Plate MarkingsBrevete Made In FranceClamp Markings
Inner Clamp MarkingsDesign CategoryParallelogram
Pivot Arm MarkingsSimplexPlate MaterialSteel
Clamp Style28.6mm Clamp; Braze-on TabCable Attachment Bolt8mm Wrench
CableStop NoClamp Bolt Type8mm Wrench
Max Ring Difference   
General Information
The first version of the Super LJ front derailleur: arm on the front, hollowed clamp axle working as a cable guide, engraved plate. On the later version (early 70's), the arm was positioned on the rear. The change was probably motivated by the fragility of the hollowed clamp hinge, which is reported to break easily.
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Additional Resources
Resources:Reference & ChartsCatalogsExternal Resources
Component VariationsView Detailed List  Manage Variations
Variations of Component exist (Component is 1 of 4)BrandGroup
Edco Touring (SLJ rebadge)Edco
Simplex Super LJ 523 (triple)SimplexSuper LJ
Simplex Super LJ 523 (triple; second version)SimplexSuper LJ
Component Groups
Primary Group NameBrandQuick InfoBrowse Group Components
Super LJSimplexRoad RaceView 27 Components
Details:   The best of the Simplex lines of components.  Consisted primarily of Front and Rear Derailleurs as well as Shifters.  The SLJ designation was also given to other parts occasionally such as seat posts.
Brand Information(click to expand)

Known for their black plastic (Delrin) derailleurs during the "bike boom" of the 1970's, they were at the forefront of innovation over the years, producing such highly regarded items as the Super LJ derailleurs, Retrofriction shifters, and very popular line of seat posts.

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