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You won’t find an issue with Wireless as much but let’s say you need to swap your stock bar for 20mm wider. A once 30min job becomes a 90min job (or an evening job if you are the heavy handed type) with some predictable swearing whilst routing your cables back through the stem and bar. If you end up with a mechanical bike (many manufacturers are still offering mechanical groups on completes) then even a mundane gear inner and outer change can become a worst nightmare to a would be home mechanic
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But seriously how often do you change bars? Once you're happy with fit, with wireless and hydro it's fit and forget, once its set, it's all good.
As stated, Cannondale's integrated solution is one of the best, all the wires go down a hole at the front of the frame, you don't need to take the stem off etc, its actually very simple.
Where exactly is the issue with servicing the all-internal-cabled bike sorry? Considering most of these are electronic or even wireless (Shimano is going wireless too afaik), and I have never had to disassemble any hydraulic brakes just yet on any of my bikes?
Genuine interest and not taking a piss as I said to myself the only bike I'm upgrading my old Cannondales to is a disc-wireless-fully-integrated 21st century bike.