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Simplex LJ1000 CP
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Category:  Rear Derailleurs
Name:  Simplex LJ1000 CP
Brand:  Simplex
Primary Group:  LJ
Model:  LJ1000 CP
Years:  1975 - 1981
Country:  France
Weight:  237 grams (Actual)
Added By: tmundry67 on 03/05/18
Updated By: tmundry67 on 01/19/22
Additional Photos - click for full size
Simplex LJ1000 CPSimplex LJ1000 CPSimplex LJ1000 CPSimplex LJ1000 CPSimplex LJ1000 CPSimplex LJ1000 CP
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Outer Plate MarkingsSIMPLEX / LJ1000Inner Plate MarkingsSimplex / Brevete / SGDG / Made in France
MaterialAluminum Alloy; Plastic; SteelDesign CategoryInline parallelogram
Attachment Bolt SizeSimplex Special Bolt for threadless Simplex DropoutsCable Attachment Bolt Size5mm Wrench
Shifting SystemsFrictionCable AdjusterNo
Cage LengthShortMax Cog Size24T (with chain guide) 26T (w/o chain guide)
Max Chain Wrap26T (with chain guide), 28T (w/o chain guide)  
General Information
LJ stands for Lucien Juy, the founder of Simplex. The LJ 1000 is the model on the lower end of the LJ Series which itself is the mid range model series between the SX series and SLJ Series. It is also very similar to the LJ 4000 except the metal parts which were significantly heavier with the LJ 1000 as tehy are made from steel instead of aluminum alloy. Earlier Models had a riveted logo on the front plate whereas later LJ 1000 had glued badges. The model assignment "CP" stands for "Course Professionelle" dedicated for racing. The jockey wheel cage is mounted to the lower knuckle bolt in the middle between the wheels. This reduces the capacity (and better adapts to lower sloping racing freewheels) as compared to the "T" (Touring) Models where the wheel cage is mounted higher to the upper jockey wheel (see LJ 1000 T for comparison). The model presented here, does not have the plastic chain guide on the upper (lead) wheel. It was also available in a "grand touring" or "Grand tourisme" (GT) version with long pulley cage and larger capacity. As well, like with nearly all models one could choose between Simplex special bolt array (designed for threadless Simplex dropouts attached with screw from inside the frame) or for standard dropouts including hanger /claw for axle.
Quality:Rarity:
 
 
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Additional Resources
Resources:Reference & ChartsCatalogsExternal Resources
Component VariationsView Detailed List  Manage Variations
Variations of Component exist (Component is 1 of 3)BrandGroup
Simplex LJ1000 TSimplex
Spidel LJ1000 T (Simplex)Spidel
Component Groups
Primary Group NameBrandQuick InfoBrowse Group Components
LJSimplexView 1 Components
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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