1950’s Simplex Pull Chain Front Derailleur

2017-02-25-002

I was cleaning out one of my parts bins and discovered this unusual Simplex pull-chain front derailleur.  I can’t remember the bicycle this came from, so I didn’t have any clue as to its date of manufacture.  But, I assumed this piece dated from the 1950’s to 1960’s.

2017-02-25-011 2017-02-25-009

I pulled out my copies of The Dancing Chain and The Data Book, hoping that I could spot some info about this front derailleur.  But, nothing was there.  Then I did an internet search and found that a 1938 version of this front derailleur is on sale on eBay.  Additionally, there are some photos on flicker featuring an earlier version of this model.  I also found what appears to be this exact model on the Velobase website – a Simplex Juy 56 front derailleur.

2017-02-25-003 2017-02-25-006

This Simplex front derailleur features an adjustable cage for adapting to 1/8″ or 3/32′ chain sizes, effected by the two screws on top of the derailleur cage.  I disassembled the derailleur for cleaning, and was able to observe the specifics of how it operates.

When the pull chain is engaged by a shifter cable, the whole mechanism slides on the two cylinders which attach to the cage.  One of the cylinders contains the spring system, and the other is meant to provide stability to the cage as it slides, so is rigid.

2017-02-25-007

The derailleur mounts to a seat tube bracket with two bolts, shown on the left side in the photo above.  If a frame lacks such mounts, then brackets can be attached to the derailleur so that it will mount to any seat tube.

2017-02-25-005

The eBay model for sale today is purportedly a 1938 “NOS” version with a $475 asking price.  We’ll see about that.  Meanwhile, I am going to keep this front derailleur in my collection, in case something comes along that warrants its application.

One thought on “1950’s Simplex Pull Chain Front Derailleur

Leave a Reply

Fill in your details below or click an icon to log in:

WordPress.com Logo

You are commenting using your WordPress.com account. Log Out / Change )

Twitter picture

You are commenting using your Twitter account. Log Out / Change )

Facebook photo

You are commenting using your Facebook account. Log Out / Change )

Google+ photo

You are commenting using your Google+ account. Log Out / Change )

Connecting to %s