I have noticed that many carbon frames have a pass-through in the bb lug for the shifter cable and some come with a teflon (?) tube to prevent wear on the frame by the shift cable.
It has been suggested that this tube is unnecessary and may even cause shifting problems. Additionally, the shifting will be fine without it and the groove that would be worn by the cable would never affect the integrity of the frame (which I can believe).
Anyone with practical experience one way or the other?
It has been suggested that this tube is unnecessary and may even cause shifting problems. Additionally, the shifting will be fine without it and the groove that would be worn by the cable would never affect the integrity of the frame (which I can believe).
Anyone with practical experience one way or the other?
I've gotten smoother shifting using a plastic tube. I don't even think that they are PTFE. Keeping the pass through clean, whichever method you choose, is requisite.
I have also used a piece of plastic tubing in plastic cable guides. The guides, particularly on wide downtube frames, get slots cut into them with time.
