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Just the dropper cable for now but my bike apparently has this tube in tube setup.
Does that mean that I can just pull out the old outer and inner together and the new ones will slip in from the top like a greased otter down a waterslide?
Which bike?
Some bikes with internal pipes for cables are brilliant so you can just push a new outer cable through. Others however, have tight bends or bits of carbon sticking out making it slightly more challenging. For those, I push the next nner cable through first then slide the outer over.
If you're replacing an existing cable and not sure about the internal pipes; put a new inner cable in the existing outer first, the put the new outer onto that and slide the new and old outer together.
Or use a SRAM conectormajig screw thing.
My Trek was a git to get the outer through the tube at the BB area, had to try and hook and pull it whilst pushing. My wife's Lapierre has a tube that stops at the BB, managed to push the outer into the seat seat and when pulling it out for another go it kinked, and couldn't pull as it could hear it crunching the end of the carbon tube! I think I could access it by removing the push fit BB but bought a Boroscope camera and managed to untangle it after lots of faffing.
GT Sensors have good internal piping. Only fiddly bit is on smaller sizes where the dropper cable goes under the rear shock and back in the frame. Larger sizes the cable goes next the the shock and back in the frame.
I've got a 'tube in a tube' thing on my Salsa Beargrease and it's great, as internal cables go, absolute doddle, just push it through. Hopefully yours is like that too
However, still not as good as external, much more faff when converting between geared and ss, with external you can just take everything off in one go all still attached and not have yo set the mech up again when you replace it
As per @mjsmke , whenever running fresh cables simply push either a new inner (from the correct end)m or even better, a sacrificial inner (from the 'wrong' end) up the existing outer, then you remove the outer leaving the inner as a guide. New outer then simply pushes over this outer.
GT Sensors have good internal piping
Splendid news. Mine's XL. The route is obvious and looks very "fixable" by taking out the BB if it goes wrong. I'll either use an inner as a guide or else join the new & old cable outers and pull through.
Thanks all