Simplex LJ 23
Main Photo
Category:  Front Derailleurs
Name:  Simplex LJ 23
Brand:  Simplex
Model:  LJ 23
Years:  1961 - 1963
Country:  France
Added By: JFischer on 10/21/07
Updated By: peterbman on 03/13/16
Additional Photos - click for full size
Simplex LJ 23Simplex LJ 23Simplex LJ 23
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# Rings Designed For DoubleOuter Plate MarkingsSimplex logo
Inner Plate MarkingsBrevete S.G.D.G Made In FranceClamp MarkingsSimplex Logo
Inner Clamp MarkingsNoneDesign CategoryPushrod
Pivot Arm MarkingsN/APlate MaterialSteel
Clamp Style28.6mm ClampCable Attachment Bolt8mm Wrench
CableStop NoClamp Bolt Type8mm Wrench;
Flat Head Scewdriver
Max Ring Difference   
General Information
Two variations out there. One with the riveted Simplex badge on the clamp plate, the later one had a decal. one pictured here is the earlier version.
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Additional Resources
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Resources:Reference & ChartsCatalogsExternal Resources
Component VariationsView Detailed List  Manage Variations
Variations of Component exist (Component is 1 of 2)BrandGroup
Simplex LJ 23 (2nd Version)Simplex
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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