Talking to a custom framebuilder in China about a Ti bike. They seem unwilling to drill holes for cable routing in the downtube if the tube is double butted. Their suggestion is, if you want cables to be routed through the downtube, it’s better to have straight gauge tubing.
I’ve worked with another builder in India, and he says it’s fine, as long as the holes are reinforced.
My questions are -
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Is it really unsafe to drill holes into double butted titanium? It won’t be just a hole. One of those grommet thingies will be welded on.
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Will straight gauge tubing be much heavier than butted tubing? If you need to know the dimensions for this, I can share.