new rear derailer for a vintage 10 speed

Discussion in 'Cycling Equipment' started by Airfoil, Sep 6, 2004.

  1. Airfoil

    Airfoil New Member

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    I'm rebuilding a 30 year old Legnano road bike, (10 speed, friction shifting) and thinking of getting a newer, (probably used) "index" rear derailer. Of course, I don't expect it to index shift...but it should work, right? or am I assuming too much? I saw a used Campy long cage 8 speed on Ebay and thought I could replace the old campy NR short cage so I can put a larger freewheel on the bike.
     
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  2. boudreaux

    boudreaux New Member

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    An index RD will work.Don't assume a long cage with shift a bigger cog.Cage length is about chain wrap capacity. Large cog capacity is in the parallelogram. An MTB RD will shift big cogs.
     
  3. Airfoil

    Airfoil New Member

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    I've got a feeling I'm about to open a can of worms here...

    OK, I've got a 53/42 front and more or less a "corncob" freewheel on the back, with a Campy NR rear Derailer. (at 53, I can't pedal like I used to)
    Is there somewhere, someone who can tell me the biggest freewheel that will fit with that set-up? I'm guessing a 22 or 24 cog would be about max...

    A MTB RD is a option, but I would like to keep the bike "all campy" if possible...I've seen the new Campy road RD's come in long, med. and short cage, and assumed...(there I go, again) that would do the trick.

    I understand that a few years back Campy made MTB components, as well as "touring" rears, both of which seem rather expensive now due to limited availability (I guess)...used "newer" Chorus and Record 8 speeds are going for less than a old Rally touring long cage...

    I guess I might pay for a brand new Chorus... if I knew it would work... I really love the old Legnano..first real bike and all...still works after all those years.
     
  4. dabac

    dabac Well-Known Member

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    Would it really? There was this this Shimano low-end road RD (positron?) years and years ago which had the indexing in the RD. There was a serrated comb stuck in the parallellogram that was supposed to line up to the cog spacing. Most easily recognised by the use of a solid piano wire instead of the usual multi-strand cable between shifter and RD. The ones I've seen were 6-speed and would require some serious remodelling to work on a 10-speed.
    OTOH if you're talking about a RD from a normal indexing system, with the index in the shifter, then that would work.
     
  5. boudreaux

    boudreaux New Member

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    And how many of the positrons? do you think are running around today? Were are taalking about reasonable current stuff here.
     
  6. boudreaux

    boudreaux New Member

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    Any of Campy current '10 speed' medium cage will work in your application and will shift a 29 rear cog. Veloce or Centaur will work and you don't have to spring for chorus. An older 8/9 speed 'racing triple' and veloce long cages were were also speced for a 28 large cog. The short cage 8/9 speed types were speced for a 26 cog,and would probably handle a few more.
     
  7. dabac

    dabac Well-Known Member

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    Well, you're usually a stickler for accuracy - and suddenly you start talking about index RD , which sounds like it means a RD that does the indexing. The "reasonable current stuff" might be indexing systems, but not indexing RDs.
     
  8. boudreaux

    boudreaux New Member

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    It wasn't me that threw out the term 'index' RD in the first place... and the poster WAS referencing current stuff designed for post 1985 index shifting.
     
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