I'm a champion bike mechanic...

[Mr Purple]

So my 624km old Giant TCR with Ultegra Di2 lost 'up' on the rear derailleur on today's ride.

No idea why, batteries are fully charged and 'down' works fine. Strangely the 'holding the down shifter for multiple shifts down' function seems to work, but erratically and not under load. Everything's fully charged, haven't changed any settings.

It'll be interesting to see what it turns out to be. This is the advantage on having a relatively new Giant, I suppose - it's the shop's problem now.

[jasonc]

what is your shifter battery status?
this is one of the reasons I'm thinking about wiring my aethos - removing 2 batteries from the picture

[Mr Purple]

what is your shifter battery status?
this is one of the reasons I'm thinking about wiring my aethos - removing 2 batteries from the picture

Both fully charged, allegedly, according to the Shimano app.

Though it has the feel of a failing battery somewhere. In that it didn't break suddenly - it slowly got worse and worse until it stopped working completely. I've stuck the RD on charge but the bike's due for a going over anyway so I'll still drop it off at Giant this afternoon.

It might be something stupid like the switch in the shifter failing. It is a bit weird that 'down' was absolutely ok. In reflection I should have probably changed the shifting mode to see if double tapping worked.

[warthog1]

Trying to replace the rd cable on the Revolt at the moment. What a mission. Can't get the cable out the hole in the frame near the derailleur.

[Tim]

Can't get the cable out the hole in the frame near the derailleur.

Been there.
Pull the cable out. Tie a length of cotton securely to the end of the cable.
Feed the cable back in at the bottom bracket opening (I presume).
Suck the cotton out the end of the frame with a vacuum cleaner and gently pull/guide the cable through the hole.

[Mr Purple]

what is your shifter battery status?
this is one of the reasons I'm thinking about wiring my aethos - removing 2 batteries from the picture

Realised when I got home that the little mechanical 'click' that even Di2 has when shifting gears wasn't there on that lever.

Dropped it off at Giant who instantly confirmed the shifter is toast and will be replaced under warranty. Once again out came the phrase I hear a lot at bike shops 'I've never seen one break like that before'.

[warthog1]

Can't get the cable out the hole in the frame near the derailleur.

Been there.
Pull the cable out. Tie a length of cotton securely to the end of the cable.
Feed the cable back in at the bottom bracket opening (I presume).
Suck the cotton out the end of the frame with a vacuum cleaner and gently pull/guide the cable through the hole.

I am pretty sure it feeds through plastic tubing inside the frame.
May give that a go or a small magnet on a wire. Thanks

[jasonc]

what is your shifter battery status?
this is one of the reasons I'm thinking about wiring my aethos - removing 2 batteries from the picture

Realised when I got home that the little mechanical 'click' that even Di2 has when shifting gears wasn't there on that lever.

Dropped it off at Giant who instantly confirmed the shifter is toast and will be replaced under warranty. Once again out came the phrase I hear a lot at bike shops 'I've never seen one break like that before'.

Wonder if they tried a shifter reset - installing the battery backwards for a few minutes, then reinstall correctly. Of course a pce2 would be the best way to confirm

[biker jk]

Can't get the cable out the hole in the frame near the derailleur.

Been there.
Pull the cable out. Tie a length of cotton securely to the end of the cable.
Feed the cable back in at the bottom bracket opening (I presume).
Suck the cotton out the end of the frame with a vacuum cleaner and gently pull/guide the cable through the hole.

I am pretty sure it feeds through plastic tubing inside the frame.
May give that a go or a small magnet on a wire. Thanks

Just use a good magnet to guide the gear cable through the opening. That's what I did.

[warthog1]

Been there.
Pull the cable out. Tie a length of cotton securely to the end of the cable.
Feed the cable back in at the bottom bracket opening (I presume).
Suck the cotton out the end of the frame with a vacuum cleaner and gently pull/guide the cable through the hole.

I am pretty sure it feeds through plastic tubing inside the frame.
May give that a go or a small magnet on a wire. Thanks

Just use a good magnet to guide the gear cable through the opening. That's what I did.

Thanks

[blizzard]

If you don't have one, pick up one of cheap internal routing kits off AliExpress, absolutely worth every dollar.

Mr P, I'm not sure how one person can be so unlucky with bikes, hopefully you have better luck with your cars.

[warthog1]

Thanks Blizzard, they look good.

[Mr Purple]

Wonder if they tried a shifter reset - installing the battery backwards for a few minutes, then reinstall correctly. Of course a pce2 would be the best way to confirm

My initial thought was something to do with software or setup, but when I realised the lever completely lost its 'click' it's obviously mechanical. I'd say the switch just broke somewhere internally, so there'll be no fixing it with a software fix.

Blizzard - weirdly with my cars I'm the complete opposite! I've driven many absolute heaps over the years and none of my cars have ever let me down. Except for a 12-24 month period with my Mini when I broke absolutely everything on it, probably more to do with tripling the power output than anything else. Even that's reliable now (touch wood).