Simplex SX2
Main Photo
Category:  Rear Derailleurs
Name:  Simplex SX2
Brand:  Simplex
Primary Group:  SX
Model:  SX2
Years:  Early 1990's - Mid 1990's
Country:  France
Weight:  174 grams (Actual)
Added By: peterbman on 03/02/16
Updated By: tmundry67 on 01/27/22
Additional Photos - click for full size
Simplex SX2Simplex SX2Simplex SX2Simplex SX2Simplex SX2Simplex SX2
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Outer Plate MarkingsSX2 SIMPLEXInner Plate Markingsnone
MaterialPlastic; SteelDesign CategoryInline parallelogram
Attachment Bolt Size10mm boltCable Attachment Bolt Size8mm wrench with Torx screwdriver
Shifting SystemsFrictionCable AdjusterNo
Cage LengthShortMax Cog Size28
Max Chain Wrap30  
General Information
Similar to Alpha T Ref10071 rear derailleur. One difference is that the Alpha T has a steel inner pulley cage plate, whereas the SX2 has a plastic inner pulley cage plate. Yes, it is lightweight (the only metal part are the paralellogram plates and bolts). And: There is a real standard hanger bolt with M10x1 mm, different than all the previous 60s, 70s and 80s models. It can also be noticed that there is a third adjustment screw in the same direction as the limit screws just above the attachment bolt. It seems to be designed to adjust teh distance to the largest sprocket but I do not know how that should work. This is also not the 3rd screw as with so many of other rear derailleurs to adjust the chain wrap (which is however perpendicular in direction to the upper and lower limit screws)
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Additional Resources
Resources:Reference & ChartsCatalogsExternal Resources
Component Groups
Primary Group NameBrandQuick InfoBrowse Group Components
SXSimplexView 5 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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