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Derailer Compatibility with Traditional Dropouts

Campagnolo Std. RD

Campagnolo Rally RD

Campagnolo Valentino
& Sport RDs
Suntour, Shimano, etc.

Huret RD

Simplex RD

Campagnolo 1010

Direct fit

Direct fit

Direct fit Direct fit

Will not fit unless
RD is Campag. specific
Direct fit

Campagnolo 1010A & 1010B + Shimano & Suntour

Direct fit

Direct fit

Will not fit Direct fit

Will not fit unless
RD is Campag. specific
Direct fit

Simplex v1 Will not fit Will not fit Will not fit Will not fit Will not fit Direct fit
Simplex v2

Direct fit

Direct fit

Will not fit Direct fit Will not fit unless
RD is Campag. specific
Direct fit

Huret

Requires adapter

Will not fit; see
remarks about Huret below
Will not fit Requires adapter Direct fit

Will not fit; see
remarks about Huret below

Note:

Campagnolo's design is presently used on most all dropouts produced today, including Henry James, Long Shen, etc.

Misconceptions:

Campagnolo Rally and Simplex RDs will not fit a Huret hanger, despite the fact that these RD's are not dependent on the step location on the hanger. Huret's hanger is cast thick enough that the tabs used on Simplex and Campagnolo's Rally rear deailers do not clear the hanger:

Exceptions:

Modified Simplex v1 hangers:
Some mechanics will revise Simplex RD hangers by tapping the mounting hole to 10mm (1mm thread pitch) and filing a step on the casting. This used to be a decent method to mount a Campagnolo or SunTour derailer to a frame; however, suitable Simplex rear derailers of all models and qualities are now available through the Internet. Modification of these dropouts is now considered a sacriligeous act on frames decent and above, especially as replacement Simplex derailers of all calibers are presently available through the Internet.

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Chopped Simplex v1 hangers:
Back in the day, many mechanics with Phil Wood grease for brains (and shops concerned with quantity sales before quality) would hack Simplex v1 hangers directly off the dropout. A bolt-on hanger would be used in its place to mount Campagnolo or Suntour derailers:

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Observations:

Besides the fact that Campagnolo's first-generation Rally derailer infringed on Suntour's patents, the Rally also copies part of Simplex's mounting design and sprung top pivot. The similarities are remarkable: