Simplex SJ810 GT
Main Photo
Category:  Rear Derailleurs
Name:  Simplex SJ810 GT
Brand:  Simplex
Model:  SJ810 GT
Years:  1977 - 1985
Country:  France
Weight:  328.5 grams (avg)
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Added By: nprenet on 12/16/07
Updated By: peterbman on 11/04/14
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Simplex SJ810 GTSimplex SJ810 GT
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Outer Plate MarkingsSJ810 GTInner Plate Markings
MaterialPlastic; SteelDesign Category
Attachment Bolt Size6mm Allen KeyCable Attachment Bolt Size8mm Wrench
Shifting SystemsFrictionCable AdjusterYes
Cage LengthLongMax Cog Size39
Max Chain Wrap36  
General Information
Essentially a Simplex Prestige with a long cage derailleur. Result was a very poorly shifting heavy derailleur.
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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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WeightSourceNotesAdded By
330 GramsUnknown steel-is-real
327 GramsActual JFischer
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