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  • Could be the cable & housing need looking at.

    This. In my experience cabling and indexing the gears myself has given much better results than a shop, or Wiggle's initial setup (not that it was bad, just not as good as it could have been). 105 should shift perfectly well.

    Ditto the brakes, the standard pads are fine. Make sure they're toed-in correctly.

    Main thing with cables is making sure the outers are cut as cleanly as possible (file down any protruding bits, or do it with a Dremel), and rounded out to avoid friction, and tape the part of the cable run under the bartape firmly to the bars.

    What model of 105 is it? The current one, 5700?

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