[Rendel Harris]

Morning folks,

If anyone’s got any advice on how to fix this problem I’d really appreciate it: I’ve just put a new cassette and chain on my 2014 Ultegra Di2 10-speed. Exactly same chain length and cassette size (11-32), all was running perfectly before apart from chain wear. Now I’ve replaced the parts (with OEM parts) for some reason the gearing thinks that everything’s one cog to the left, i.e. it only runs up to the ninth cog and stops (literally stops, refuses to attempt a shift as if it thinks it’s already on the biggest cog), and running down it gets to the smallest cog and thinks it still has a cog in hand and throws the chain off (I’ve stopped this by adjusting the limit screws). I’ve tried multiple times running through the adjustment cycle from the junction box and the gears are all running perfectly apart from this problem. I’ve changed the cassette and chain many times on this bike and never had this problem, am I overlooking something blindingly obvious?

Thanks!

Topic

[hawkinspeter]

As an I.T. worker, it’s

As an I.T. worker, it’s amazing how often this works.

[Rendel Harris]

Hadn’t thought of doing that

Hadn’t thought of doing that with the battery, did it, ran through the adjustment cycle again and it’s back to perfect! Thank you so much, saved me a time-consuming trip to the LBS – much appreciated!

[hawkinspeter]

I’ve managed to confuse a Di2

I’ve managed to confuse a Di2 system before but just shifting all the way to the biggest cog would make it realise what gear it actually is in. Have you tried disconnecting the battery and reconnecting it?

[Author]

Replies