Simplex Criterium
Main Photo
Category:  Rear Derailleurs
Name:  Simplex Criterium
Brand:  Simplex
Primary Group:  Criterium
Model:  AR637NI
Years:  1971 - 1973
Country:  France
Added By: nprenet on 11/26/07
Updated By: cinco on 10/03/16
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Simplex CriteriumSimplex CriteriumSimplex CriteriumSimplex CriteriumSimplex CriteriumSimplex CriteriumSimplex Criterium
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Outer Plate MarkingsSimplexInner Plate MarkingsSimplex Brevete SGDG - Made in France
MaterialPlastic; SteelDesign Category
Attachment Bolt SizeCable Attachment Bolt Size8mm Wrench
Shifting SystemsFrictionCable AdjusterNo
Cage LengthShortMax Cog Size34
Max Chain Wrap34  
General Information
The later Criterium rear derailleur had red plastic plugs at the pivots, and a 1974 version had a different shaped pulley cage. Mid-level derailleur, often found on affordable French race/sport bicycles in the 70's.  Great design (actually the same as the SLJ's) and nice shifting, despite the use of Simplex's ubiquitous Delrin for the pivot part and the plates (those rigidified with steel).
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Component Groups
Primary Group NameBrandQuick InfoBrowse Group Components
CriteriumSimplexView 6 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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