Crossing over gear cables?

Called into a bike shop over the weekend to look at a Cannondale 29er and on looking under the down tube they had crossed over the bare inner gear cables. In all my time I have never come accross this, they said it gives slicker shifting, dont see how. Plus, surely it cant do the bare cable any good if they touch where they cross?
Am I missing something here or are they talking [email protected]?
Am I missing something here or are they talking [email protected]?
Niner Air 9 Rigid
Whyte 129S 29er.
Whyte 129S 29er.
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How does it affect the cables then? They touched where they crossed, over time wouldnt they wear down, possibly fray from all the rubbing and vibrating off eachother?
Whyte 129S 29er.
Parktools :?:SheldonBrown
Also, if you do it right, you won't need to use frame protectors or patches.
Most Specialized frames come with a stepped BB cable guide just so that criss-cross cable routing would be possible without them touching at the exposed sections.
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