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Old 02-16-10, 03:24 AM   #1
Bodeco
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Internally routed cable frame - ferrule/plug question

Hi all....

I recently got a new time trial frame and I am in the process of transferring my components from my old frame to the new one. My old frame (Cervelo P3) has an internally routed rear brake cable. Near the rear end of the top tube, the cable exits the frame through a little insert that fits into the cable hole. The insert slides into the hole, then the cable housing and ferrule slides into the insert. There is a small hole for the cable, and the ferrule sits against the back of the insert preventing it from slipping into the frame.

My new frame came with similar inserts... but oddly enough, there is nothing in the insert for the ferrule to rest against. First time I squeezed my rear brake lever, the ferrule and housing just sucked into the frame through the insert. I've looked at this and scratched my head for a few hours and just can't seem to figure out how this is supposed to work.

So as you see in the attachment, the ferrule is in the insert... but I am sure over time it will work it's way into the frame, just like the rear one. Any ideas? I'm sure I must be missing something simple.
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Old 02-16-10, 03:41 AM   #2
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My bet: the cable housing is meant to go through the frame continuously.
One long piece all the way from the lever to the caliper.
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Old 02-16-10, 08:48 AM   #3
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Originally Posted by Metzinger View Post
My bet: the cable housing is meant to go through the frame continuously.
One long piece all the way from the lever to the caliper.
+1. The OP probably has a modern version of my Pinarello's rear brake cable setup; full brake housing from brake lever to brake. Except there are no "inserts" on my Pinarello, those are brazed-on fittings with a brass guide inside the top tube. I imagine the OP's bike has removable inserts so it will be easier to feed the cable through the tube without a guide. Then, once the cable is through, secure the insert into the frame for a tight fit:


Last edited by well biked; 02-16-10 at 08:59 AM.
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Old 02-16-10, 11:15 AM   #4
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Quote:
Originally Posted by Metzinger View Post
My bet: the cable housing is meant to go through the frame continuously.
One long piece all the way from the lever to the caliper.
Let's not guess. The OP has the bike in front of him,

1) What frameset is that
2) Is the cable and housing "guided" all the way out to the back of the exit? If not the rear brake exit should have a removeable stop. If it doesn't your frame is missing 2x stops.
3) Modern pinarellos (e.g dogma) will appear to take cable and housing full length through the top tube but this is incorrect. The frames come supplied with frame stops.
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Old 02-16-10, 12:36 PM   #5
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Many thanks for the replies. I believe the intent is to have housing from lever to brake. That thought never even crossed my mind.

To answer the frame question: It's a Leader LD-735 TT frame.

Cheers, wish you all were here with me in the sunny Marshall Islands... where it's always summer!
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