Internal cable routing question - first time builder
Hello everyone,
I have been reading the forum for a long time now, and learning from all of you while working on my first build. This is a great site full of inspiration and ideas, thank you!
My first question to you, experienced builders is whether you would do / avoid what I'm planning:
I'm building a fillet brazed Columbus Zona tube cyclocross frame for myself, as a first time build. All mitering is now complete. It will be using a Rival 1x11 groupset with hydraulic brakes. I'm planning to run the rear brake line and the rear derailleur cable inside the downtube. But having done my practice drilling / shaping on a scrap tube I had, it is quite a lot of material that needs to be removed from the tube, and I wonder if it would be structurally safe to do it.
Routing-wise I'm thinking it would be best if the two cables entered the down tube on the left hand side of the frame near the headtube, about 8-10cms from the miter, one above the other, quite close to each other, and exit at the bottom of the downtube on either side, close to the BB (8-10cms from the miter again), so each exit leads on to the bottom of the chainstays on either side of the frame.
I have stainless 7mm OD tubes that I plan using for the full length of the routing, brazed in place.
So: Would the downtube be strong enough still with the 4 holes? Or would it compromise the strength, and you would advise against it? Or would you place the entry / exit holes elsewhere to help structurally?
Any advice is much appreciated!
Thank you!
Gergely
Gergely Baksay
Budapest, Hungary
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