Brand Directory
Country:FrancePrimary Focus:
Years of Operation:1928 - 1995
General Information

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.


First started with a 2 speed rear derailleur. Le Simplex was produced by Lucian Juy, ran a bike shop in Dijon.

they had numerous models over the years-
Tour de France
Juy 51
Juy 543
Record 60
Super LJ
Super Competition
Bankrupt in 1985 ,they have resurfaced a few times since then.

The marking "Brevete SDGD" = Patent Sans Garantie Du Gouvernement.  More explicitly SDGD patents are issued "without prior examination, at the peril of applicants, and without warranty of the reality, novelty or merit of the invention, the fidelity or the accuracy of the description. 

View Search List by Category (# in Category)
View AllBrakes (1)Chainrings (5)Freewheels (2)
Front Derailleurs (50)Hubs (2)Rear Derailleurs (112)Seat Posts (5)
Shifters (45)Small Parts & Accessories (30)Stems (2) 
Recent Added / Updated Components
Component NameCategoryAdded / Updated
Simplex Grand Prix TypeRear Derailleurs03/21/2024
Simplex Randonneur / alternate versionFront Derailleurs03/12/2024
Simplex Tour De France / Early ModelRear Derailleurs03/09/2024
Simplex Juy 51 (similar version with no 51 markings)Rear Derailleurs03/06/2024
Simplex Tourist 303Rear Derailleurs03/04/2024
Component Groups
Group Name - View DetailsQuick InfoView All Components
 - AlphaList 4 Components
 - CriteriumList 6 Components
 - JuyList 1 Components
 - LJList 1 Components
 - PrestigeList 7 Components
 - SELEMATICRecreationList 2 Components
 - Serie SAList 2 Components
 - Silver RangeList 1 Components
 - Super LJRoad RaceList 27 Components
 - SXList 5 Components
 - unknownList 3 Components
Frame Parts - Recent Added / Updated
NameCategoryAdded / Updated
Simplex 3480/3481Drop Outs & Fork Ends02/18/2017
Simplex 4266/4267Drop Outs & Fork Ends02/18/2017
Simplex 4264/4265Drop Outs & Fork Ends02/18/2017
Simplex S806Drop Outs & Fork Ends02/18/2017
search Simplex Frame Parts List
Photo Selection from Recently Updated Items
Additional Resources
Catalog NameSourceFile SizeDate Added
Simplex 1984 CatalogVeloBase2,615kB1/5/2009
Simplex Sept. 1975 CatalogVelo-Pages.comN/A12/1/2009
1982 Simplex CatalogVeloBase2,522kB11/4/2011
Resource LinkCategoryDetails 
Simplex collectionBrand Specific WebsitesCollection of Simplex parts, well photographed, with japanese descriptions.
User Comments
Required
  Loading Comments

Main Photo
VeloBase v.2.8.7 - a Fischer Frameworks application, Copyright ¬© (2024) - All rights reserved.
This site is protected by reCAPTCHA and the Google Privacy Policy and Terms of Service apply.

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