Yes, on many internally routed bars, the only way it is possible is to route the cables and housings through the bars with quite a bit of excess exploded at the lever end. Then, without the levers attached to the anchor bolt you insert the housing into the already cabled levers and begin pushing the entire thing into the bars while attempting to keep the housing fully seated in the levers and simultaneously mounting the levers. It usually forces a kink or really awkward bend in the housing. Some internally routed bars are not too bad and I think the ergonovas fall into that category. Others are a bear and I won’t even do them anymore. I just finished up a Pinarello K8-S which I completely rebuilt because the initial build was so bad.
And here’s the cable housings that were previously installed. Clearly the builder had some issues...
The other thing, with Campy mechanicals, is that it often forces the derailleur cable out the opening in the lever with the more acute bend. There are two options and I will never use that option unless forced to like in this scenario. What will happen ultimately, and it will happen, is that the cable will fray there and eventually jam up, much like the Shimano levers do all the time with their cable routing.
So, yes... wherever possible I try to avoid difficult internal routings with a mechanical drive train. That doesn’t mean all internal routings are bad, in fact I really like routing through the down tubes etc where there aren’t any additional awkward bends incurred. But for most handlebars that simply isn’t the case.
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