Another DIY rear derailleur cage.

[jordic1968]

Hi there
I was determined to fit a 5 speed 14-34 freewheel (that I nicely got from a member of this forum) on my Colnago Super with a gen1 Super Record RD. I'm aware there is the Rally RD for that purpose, and also some other diy builds from the 70's and later, incl. a nicely build rd cage from the same purpose available on ebay already but just wanted to experiment myself - with limited resources ;(

Let me share here some pics to illustrate how I made it. This is just a prototype for testing purposes, several holes allow different positions for the pulleys, also not fully tested as still need to get the stem and brakes fitted to ride it, but guys let me know how it looks to you. Any advice about positioning, sizing,... is really welcomed.

https://imgur.com/BeVS5kv

 

[Nob]

Hack or bodge

 

[Guinessisgoodforyou]

Prototype.

 

[Old Ned]

No inner cage side?

 

[jordic1968]

not yet, this is just a prototype to play with different positions of the pulleys and check which one works better. Final version will have a nicely shaped outer and inner cages as similar as the original as possible, that is the goal. But for now I,m interested to check functionality for a 34 teeth cog

 

[N-plus-one]

Hi there
I was determined to fit a 5 speed 14-34 freewheel (that I nicely got from a member of this forum) on my Colnago Super with a gen1 Super Record RD. I'm aware there is the Rally RD for that purpose, and also some other diy builds from the 70's and later, incl. a nicely build rd cage from the same purpose available on ebay already but just wanted to experiment myself - with limited resources ;(

Let me share here some pics to illustrate how I made it. This is just a prototype for testing purposes, several holes allow different positions for the pulleys, also not fully tested as still need to get the stem and brakes fitted to ride it, but guys let me know how it looks to you. Any advice about positioning, sizing,... is really welcomed.

View attachment 795637View attachment 795638View attachment 795639View attachment 795640View attachment 795641

https://imgur.com/BeVS5kv

That's really quite ingenious as a means for determining a workable design. Me like. Are you an engineer by profession?

 

[Nob]

The Mark 1 SR mech looks in great condition

 

[Mod-Master]

That’s pretty cool reminds me of this:

 

[Mod-Master]

https://bikerecyclery.com/frank-spivey-long-cage-for-campagnolo-nuovo-record-drillium-bullseye-pulleys-123mm-c-c-cupertino-spence-wolf-near-mint/

 

[Frankenorange]

Looks like it works very well indeed.

With aluminium of the same thickness as the original cage and copy the profiling, of the old cage, and your cage will look oem.