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Simplex Criterium
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Main Photo
Category:  Rear Derailleurs
Name:  Simplex Criterium
Brand:  Simplex
Primary Group:  Criterium
Model:  AR537NI
Years:  1965 - 1970
Country:  France
Added By: onespeedbiker on 11/18/12
Updated By: cinco on 10/03/16
Additional Photos - click for full size
Simplex Criterium
Outer Plate MarkingsSimplexInner Plate Markings
MaterialSteelDesign CategoryInline parallelogram
Attachment Bolt SizeCable Attachment Bolt Size
Shifting SystemsFrictionCable Adjuster
Cage LengthShortMax Cog Size30?
Max Chain Wrap30?  
General Information
Simplex had a lavish range of different variants of the Prestige rear derailleur. One that gets normally past by is the 537/P Criterium. One reason is it looks so much like the 637 Criterium. One difference is there is a notch where the pivot springs end extend through the top of the pivot bolts  not a hole like the 637; it also does not have the red plugs in the top caps. I also have a photo that shows the 537/P (identical to the derailleur photo above) with the manual but I can't post it because it's a Ebay photo..This is compared to the 537
Quality:Rarity:
 
 
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Resources:Reference & ChartsCatalogsExternal Resources
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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