Simplex Juy 51 (similar version with no 51 markings)
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Category:  Rear Derailleurs
Name:  Simplex Juy 51 (similar version with no 51 markings)
Brand:  Simplex
Model:  Juy 51 (no Juy 51 markings)
Years:  1940's - 1950's
Country:  France
Added By: Retroryder on 03/06/24
Updated By: Retroryder on 03/06/24
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Simplex Juy 51 (similar version with no 51 maSimplex Juy 51 (similar version with no 51 maSimplex Juy 51 (similar version with no 51 maSimplex Juy 51 (similar version with no 51 ma
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Outer Plate MarkingsLE SI.PLEX MADE IN FRANCEInner Plate Markings
MaterialSteelDesign CategoryChain Pull
Attachment Bolt SizeCable Attachment Bolt Size
Shifting SystemsCable Adjuster
Cage LengthMax Cog Size
Max Chain Wrap  
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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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