Chain stay internal routing,
I know internal cable routing is a very marmite subject, you either love, or hate it. Personally i appreciate it for its clean lines, but this post is more about my lack of knowledge of structural strength or drilling holes in small tubes!

So i currently have internal routing in my downtube, and am considering wether to run my disc hose / gear cable along the top of my chain stays, or to go internal. Realistically i shouldn't even be having this thought, because its all for about 9" of cable. Anyway, here's some pictures. You can see the black ovals which are rough approximations of where i will cut. I'm planning on using the same style of cap as pictured, but will have to re-work it significantly to get it to match the tube radius. Am i significantly weakening the stay by cutting a hole in it, bearing in mind that the steel tube and also the cap will all be silver soldered together. It is a Columbus Spirit chain stay 0.7mm at the thick end 0.5mm at the other.

Absolutely any input what so ever is appreciated!

Mark Cordall

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