Simplex LJ4000 T (version 3)
Main Photo
Category:  Rear Derailleurs
Name:  Simplex LJ4000 T (version 3)
Brand:  Simplex
Model:  LJ4000 T
Years:  1985 - 1990
Country:  France
Weight:  184 grams (Spec)
Added By: JFischer on 12/01/09
Updated By: peterbman on 03/13/16
Additional Photos - click for full size
Simplex LJ4000 T (version 3)
Outer Plate MarkingsSimplexInner Plate MarkingsSimplex Super LJ
MaterialAluminum Alloy; PlasticDesign Category
Attachment Bolt SizeCable Attachment Bolt Size
Shifting SystemsFrictionCable AdjusterNo
Cage LengthLongMax Cog Size36
Max Chain Wrap40T  
General Information
Simplex LJ 4000 rear derailleur. Design is identical to the SLJ model, but upper and lower pivots are made with Delrin (Simplex's miracle plastic...), instead of aluminum.. This is the Long Cage version which was known as the 4000 GT.  There are two other versions with shorter cages.
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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
Gipiemme Dual SprintGipiemmeDual Sprint
Simplex LJ4000 CP (version 1)Simplex
Simplex LJ4000 CP (version 3)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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