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Weird Front Mech - Help!

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Weird Front Mech - Help!

Old 07-22-21, 05:35 PM
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VtwinVince
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Weird Front Mech - Help!

I'm rebuilding a Bianchi Sika which has a strange LX front derailleur. Instead of the usual hex bolt clamp for the cable, it has a machined and recessed round thingy that looks like it will take the end of the cable housing. Anyone have experience with this?
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Old 07-22-21, 05:45 PM
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Can you post pictures? I've never seen one that doesn't have a bolt-type clamp of some sort.
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Old 07-22-21, 05:53 PM
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Looks like top pull cable routing if that helps....
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Old 07-22-21, 08:11 PM
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Likely a bottom pull FD set up for top pull. My 1990 Trek 970 has that. Cable runs from the top and the, housing goes into the derailleur arm and inner cable continues to anchor under a bolt below. Inner cable stays stationary and the housing moves the arm.
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Old 07-22-21, 08:33 PM
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Like this.
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Old 07-22-21, 09:06 PM
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Note that in this setup, the cable housing needs to have enough of a curve to allow the housing to move downward when the shifter is activated.
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Old 07-23-21, 10:20 AM
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Originally Posted by dedhed View Post

Like this.
Thanks much for posting this picture. I work on a lot of bikes as a volunteer at my local co-op and see a lot of new-to-me things. I now will know how to manage one of these when one comes my way.
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Old 07-23-21, 12:07 PM
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Yes, many thanks, that is the exact setup which I'm puzzling over.
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Old 07-23-21, 12:16 PM
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Thanks, new to me as well.
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Old 07-23-21, 01:36 PM
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So is it correct that the cable end is held fast to the frame and the housing moves to change the DR position?

That's a new one for me too!
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Old 07-23-21, 02:04 PM
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After many decades of working on bikes this is the first time seeing this for me too. Thanks!
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Old 07-23-21, 02:53 PM
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Seen this only a few times. But those of us who have worked on Simples sliding ft ders know well the nature of a cable stop moving type of design. The longer one does the old bike servicing the more simple logic helps Andy
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Old 07-23-21, 05:26 PM
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Originally Posted by VtwinVince View Post
Yes, many thanks, that is the exact setup which I'm puzzling over.
That was one way to do top pull cables before derailers were designed for top pull. Another way was to run the cable from a stop, down around a pulley, and back up to the derailer. Keeps the front cable out of the gunk that bottom routed cables can encounter.

What’s the question?
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