I'm preparing to the job of replacing my current LX derailleur + shifters by SRAM 9.0 + x.0 twisters. Now learning cabling stuff.
On my bike (like I believe on most) the cables housing goes by sections - the first goes from the shifter to the first frame stop, second - from the second frame stop to the third one.
Between the two first frame stops and after the third towards the derailleur the cables goes exposed, i.e. without the housing (under the top tube).
Someone on local bike forums advised to use the housing all the time along the cable run until the last frame stop, i.e. drilling the first two stops in order to allow enough clearance to pass through the cable with its housing, i.e. by that avoiding the exposed cable run under the top tube. He claims that this is more robust way having as least as possible exposed cable to the environment. Of course cable lubing (inside the housing) is also done.
On the other hand, I'm a bit hesitating to do that, just because if that would be really good thing, I believe frame manufacturers (or at least many experienced riders/mechanics) would persuade this approach.
Any advise/opinions on that ?
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Thread: Feeding gear cables