Simplex Tourist Monobloc 303
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Category:  Rear Derailleurs
Name:  Simplex Tourist Monobloc 303
Brand:  Simplex
Model:  AR76/186/185
Years:  1956 - 1960
Country:  France
Added By: Catnap on 07/24/13
Updated By: peterbman on 11/04/14
Additional Photos - click for full size
Simplex Tourist Monobloc 303Simplex Tourist Monobloc 303Simplex Tourist Monobloc 303Simplex Tourist Monobloc 303Simplex Tourist Monobloc 303Simplex Tourist Monobloc 303Simplex Tourist Monobloc 303Simplex Tourist Monobloc 303
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Outer Plate MarkingsSimplex / JUY SimplexInner Plate Markings
MaterialSteelDesign CategoryRod
Attachment Bolt SizeBolt OnCable Attachment Bolt Size8mm Wrench
Shifting SystemsFrictionCable AdjusterNo
Cage LengthShortMax Cog Size
Max Chain Wrap  
General Information
Plastic pulleys date this derailleur to the late 1950s +. Not to be confused with the 303 Tourist rear derailleur, the Simplex Monobloc Tourist 303 was a later chainstay-mounted design that did not require an external spring to tension the cage.  A single coiled spring controls both the inward and outward movement of the cage as well as the chain tension.  The derailleur is top-normal, staying in the lowest gear unless the bell-chain is pulled.   
Quality:Rarity:
 
 
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Additional Resources
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.

 
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