Simplex 637, Criterium
Back
Report
Main Photo
Category:  Rear Derailleurs
Name:  Simplex 637, Criterium
Brand:  Simplex
Model:  637
Years:  Late 1960's - 1970's
Country:  France
Added By: nprenet on 11/27/07
Updated By: peterbman on 04/09/14
Additional Photos - click for full size
Simplex 637, CriteriumSimplex 637, CriteriumSimplex 637, CriteriumSimplex 637, CriteriumSimplex 637, CriteriumSimplex 637, CriteriumSimplex 637, Criterium
 Verify Component Photos
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
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).
Quality:Rarity:
 
 
See Incorrect Information? Log-in to submit report.  
Additional Resources
Marketplace:Looking to buy one of these?Sell one like this
Resources:Reference & ChartsCatalogsExternal Resources
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.

 
User Comments
Sign-in Required
  Loading Comments


By pressing Verify below, you express verification that the photos shown are indeed of the component listed. Please do not verify if you are not sure that all photos are of the correct item. If you identify a photo that is NOT of the correct item, please use the Report feature to flag that photo.

Note: You can not verify photos that you have uploaded.
Brooks Saddles
VeloBase v.2.7.8 rev.5 - a Fischer Frameworks application, Copyright ¬© (2014) - All rights reserved.

Find the information on VeloBase.com useful? Please consider donating a few dollars towards the web-hosting cost. Thank you.