Simplex Super LJ (2nd version? with front control arm)
Main Photo
Category:  Front Derailleurs
Name:  Simplex Super LJ (2nd version? with front control arm)
Brand:  Simplex
Primary Group:  Super LJ
Model:  Super LJ
Years:  Mid 1970's - ?
Country:  France
Added By: Wolfram Verktyg on 07/30/09
Updated By: JFischer on 09/21/09
Additional Photos - click for full size
Simplex Super LJ (2nd version? with front conSimplex Super LJ (2nd version? with front conSimplex Super LJ (2nd version? with front conSimplex Super LJ (2nd version? with front conSimplex Super LJ (2nd version? with front con
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# Rings Designed For DoubleOuter Plate MarkingsEight pointed star with S in the center
Inner Plate MarkingsBrevet Made in FranceClamp MarkingsEight pointed star with S in center on front of clamp
Inner Clamp MarkingsSIMPLEX Brevet SDGS in plastic insert, SUPER LJ in metal bodyDesign CategoryParallelogram
Pivot Arm MarkingsSimplexPlate MaterialChrome plated steel
Clamp Style28.6mm ClampCable Attachment Bolt8mm Wrench
CableStop YesClamp Bolt Type5mm Allen Key
Max Ring Difference   
General Information
This is one of the many variations of Simplex Super LJ front derailleurs. These were available with a silver or gold anodized finish.

It has a riveted on cable control arm in the front instead of the cast integral arm on previous models. The Simplex down tube cable guides for this style derailleur used a piece of cable housing that ran between the guide and the derailleur. The clamp hinge pin was hollow and the bottom was the cable housing stop. The derailleur cable ran through the pin. The cable and housing usually ran in front of the seat tube but could also run behind the seat tube.

The clamp bolt has a large flange on the bolt head, probably a US CPSC "safety" concession.

The clamps on these derailleurs had a very fragile hinge joint and would crack if overtightened. Also the threads for the cable clamp screw on the control arm frequently stripped out

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Additional Resources
Resources:Reference & ChartsCatalogsExternal Resources
Component VariationsView Detailed List  Manage Variations
Variations of Component exist (Component is 1 of 7)BrandGroup
Edco (SLJ rebadge)Edco
Gipiemme SpecialGipiemmeSpecial (Strada)
Simplex Super LJ A500 AV.326SimplexSuper LJ
Simplex Super LJ A 522SimplexSuper LJ
Simplex Super LJSimplexSuper LJ
Simplex Super LJ (2nd version? with rear control arm)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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