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The cables coming out of the twist grip for my Nuvinci N380 went "sproing" the other day and I pedalled home frantically in low gear. This isn't the first time this has happened. On closer inspection the problem was pretty easy to fix—all that had happened was the cable had come out of the little slot where it connects to the "gear ring" on the hub:

close up of Nuvinci N380 hub showing transmission cable clip

The little silver clip thing has the transmission cable attached to the bottom right hand side of it; you clip it into the bottom-right slot on the "gear ring" and then click it down so the top part sits flush, levering the cable tight. Theoretically it should click into place—there are little nubs in the metal which click into the holes you can see in the black gear ring part. But the silver clip keeps "standing up" into the un-levered position and from there it's easily knocked off as it rubs against the chain guard, and I lose my transmission again.

Is this a known failure mode of these hubs? How do I fix it?

1 Answer 1

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The cable tension should keep it flat & clipped in. I would first look at the orientation you are installing the gear cable and make sure it seems like physics is on your side. I would also check that there is a minimum of slack in the two cables. The plastic hub shifting mechanism and the cable stops are available as cheapish spare parts if you feel that yours has become worn down with all this action. Follow the documented procedure to swap it out if you do this so as not to lose gear range.

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  • I had a suspicion it might have something to do with the cable tension, the whole twist grip was replaced during the bike's last service and the cables might have "stretched in" a bit. Which end would you guess I should look at to adjust that, the twist grip end or the hub end? May 13 at 12:41
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    Minor adjustments at the shifer/handlebar. The cables need to be cut almost flush at the hub end so more difficult to adjust there. @RobertAtkins
    – JoeK
    May 13 at 12:48
  • "make sure it seems like physics is on your side" - I'm going to steal this neat aphorism.
    – Spike0xff
    May 13 at 18:10

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