You can route either or both the brake and derailleur cables thru the bars or front and/or back of the Kwing conventionally as with a traditional Al bar. With Campy, I route the derailleur cables around the backside of the Kwing and brake cables thru the bar...transparent from a feel standpoint as I wrap the entire bar. Campy tends to work best with the freest cable compression and bends and why I do it. The Kwing carbon compact is the best bar I have ever ridden. It measures a bit small so keep that in mind if you are considering it...flairs at the bottom where it is measured. If you typically ride a 42cm bar...get the Kwing in a 44cm...what I ride. Best aspect of the bar aside from flat top and great compact hook shape is vibration damping...good for aging cyclists in particular...more comfy than a std. Al drop bar. On a budget, the FSA Wing Compact in Al is great bar as well...what I rode prior to the Kwing.