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Front Derailleur Standards and Mounts

Bottom Swing / Traditional

The swing is determined by the position of the cage relative to the mount. A bottom swing, or traditional derailleur has the cage that is below the clamp. This is the most common type, and will be found on all braze-on and clamp mounted derailleurs.

Top Swing

The swing is determined by the position of the cage relative to the mount. A top swing derailleur has the cage either flush or just below the clamp. These can be found on some mountain bikes where a taller profile would interfere with water bottle boss or other obstruction.

Bottom and Top Pull

Pull refers to the direction that the cable will come from and be pulled from. Some derailleurs only support one direction, while others may support both.

Clamp Mount

Many frames do not have special tabs or holes on the frame for mounting a derailleur. For these, a seat tube clamp is used. The derailleur and clamp you purchase will need to match the diameter of the seat tube. Item descriptions should list the diameters they fit.

Braze-On Mount

Braze-On derailleurs require a frame with a braze-on mount tab on the seat tube of the frame.

High Direct Mount

This Direct Mount Derailleur has 1 mounting bolt and a long, vertical ridge on the backside of the derailleur to the left side of the bolt. Shimano derailleurs of this type have a "-D" suffix (i.e. FD-M770-D) and calls them simply "Direct Mount". SRAM calls these "High Direct Mount".

E2 Direct Mount

This Direct Mount Derailleur has 2 mounting bolts, 22.1 mm apart from one another. These mounting holes are NOT flush with one another on the back plate. There is a 5mm offset between them. This direct mount is based on an E-Type front derailleur with the backplate removed and the derailleur mounted directly to the frame. Shimano derailleurs of this type have a "-E2" suffix if they do not have a backplate installed or "-E" if the Back plate is installed (i.e. FD-M770-E2 or FD-M770-E). Some "-E" derailleurs can be used both ways. SRAM calls these "S3 Direct Mount". The SRAM derailleurs will mount to an E2 Direct Mount frame, but CANNOT be used in conjunction with an E-Type back plate as an E-Type derailleur. This has been used by Yeti, Specialized, Cannondale, Pivot, Lapierre and other builders.

S1 Direct Mount

This Direct Mount Derailleur has 2 mounting bolts, 42.7 mm apart from one another. These mounting holes are flush with one another on the back plate. Only SRAM produces derailleurs to fit this type. This has, to SRAM's knowledge only been used by Specialized. It was primarily used on 2010 Eras, Epics and Stumpjumpers. After 2011, Specialized has started to transition to using the E2 Direct Mount, but some versions may still use the S1.

S2 Direct Mount

This Direct Mount Derailleur has 2 mounting bolts, 22.1 mm apart from one another. These mounting holes are flush with one another on the back plate. Only SRAM produces derailleurs to fit this type.