• My Di2 rear mech thinks it is one gear higher than it actually is.

    It wants to shift into a larger sprocket that isn't there, so would go into the spokes if I didn't have the limit set in. And it won't go into the smallest sprocket.

    When I hook it up to e-tube it confirms this - eg when it is actually in the 4th biggest sprocket, the software says it is in the 5th biggest.

    The problem came about after I broke my hanger in November. I changed it, and put the bike on the turbo and thought something was odd but didn't need all the gears on turbo so didn't look at it, until yesterday I got the bike ready to ride and realised there was an issue.

    I've just changed the Hanger again and it is still the same, one gear out of phase.

    I can't see any way to reset it in the software. There aren't enough trimming 'clicks' available to shift it fully to the right gear. It's like I need to reboot the mech but can't see how.

    Anyone come across this? When I Google it I mostly get people saying it's the hanger, but I've changed the hanger twice and it hasn't helped.

    It's ultegra 6870.

  • Normally you set the limits and then doing the trimming while in a middle cog - are you doing that? If the limits are too far in, then it's "middle" will be off and you'll be out of trim range.

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