Sergio_CH

Hi, everyone

I just bought my first ever road bike - a Cube Agree C:62 SL Ultegra Di2 (last years model with rim brakes).

50/34 and 11/32


It rides well, I went out for 30 miles, but I did not actually check if all gears work before today.

Today I had to change the rear tube due to puncture.

When I clicked the button, shifting the rear to the smallest sprocket, the chain stopped at the next to smallest sprocket.

Clicking more on the button did not move the rear derailleur any further.

Does that mean that the previous owner switched to the smallest sprocket, changed the tube, and incidentally put the chain on the next to smallest sprocket when he put the wheel back?


I took the wheel out, changed the flat, put the wheel back and put the chain on the smallest sprocket.

I then checked the rear shifting, the chain was on the biggest sprocket on the front and on the back I could switch all the way from the next to smallest to the largest sprocket.

When I moved to the largest rear sprocket and clicked one more time the rear derailleur made a move but the chain did not jump off the largest sprocket, I just heard a ticking noise for a few seconds and then it stopped. Is that automatic chain protection?

Then I shifted back from the largest to the smallest sprocket on the rear but the chain stopped again on next to smallest sprocket and clicking on the button would not move rear derailleur any further.


What is wrong here? Why can't I move to the lowest sprocket?

So now I am on the next to smallest rear sprocket and clicking on the button does not move the rear derailleur. Should I now take the wheel off and put the chain on the smallest sprocket? Would that fix the problem?


Thank you in advance!

Sergio_CH

Hi, everyone

I just bought my first ever road bike - a Cube Agree C:62 SL Ultegra Di2 (last years model with rim brakes).

50/34 and 11/32


It rides well, I went out for 30 miles, but I did not actually check if all gears work before today.

Today I had to change the rear tube due to puncture.

When I clicked the button, shifting the rear to the smallest sprocket, the chain stopped at the next to smallest sprocket.

Clicking more on the button did not move the rear derailleur any further.

Does that mean that the previous owner switched to the smallest sprocket, changed the tube, and incidentally put the chain on the next to smallest sprocket when he put the wheel back?


I took the wheel out, changed the flat, put the wheel back and put the chain on the smallest sprocket.

I then checked the rear shifting, the chain was on the biggest sprocket on the front and on the back I could switch all the way from the next to smallest to the largest sprocket.

When I moved to the largest rear sprocket and clicked one more time the rear derailleur made a move but the chain did not jump off the largest sprocket, I just heard a ticking noise for a few seconds and then it stopped. Is that automatic chain protection?

Then I shifted back from the largest to the smallest sprocket on the rear but the chain stopped again on next to smallest sprocket and clicking on the button would not move rear derailleur any further.


What is wrong here? Why can't I move to the lowest sprocket?

So now I am on the next to smallest rear sprocket and clicking on the button does not move the rear derailleur. Should I now take the wheel off and put the chain on the smallest sprocket? Would that fix the problem?


Thank you in advance!

GeneO 

Di2 limits the small-small combo to prevent cross-chaining.. When you are in the small chainring you can't shift down to the two smallest cogs.

spjam

I've found that all things DI2 related can be found in di2center.com

It willl explain it, and how you can disable the gear position control.

Iride01 

Sorry, I don't quite follow exactly what you are saying. However, If you are in the small front, then Di2 is locked out of the small cogs on the back. Probably depends on how many gears you have on the back and maybe model of Di2.

At any rate, with a new to you bike, no matter how old it is I'd highly recommend you get it tuned up and evaluated at a bike shop. Unless perhaps you are already pretty skilled at working on and adjusting all it's pieces parts.

Sergio_CH

Thank you, but that was of no help.
You did not read what I wrote: I am on the biggest front sprocket and while I am on the biggest front sprocket I can go across all rear sprockets except for the smallest one.
I do not know why I can go to the biggest rear sprockets, maybe it is set in E-tube software, but not being able to shift to the smallest rear sprocket is an error of some sort.

Dean V

Adjust the limit screw on the derailleur.

Rogerogeroge

That has nothing to do with it. The derailleur will find the right sprocket. It sounds to me like your shifting is set up terribly. I would start from ground zero (or take back to the LBS it wasn't mail-ordered). Research a few vids, I think Shimano even has tech docs that detail setup. Start at the very beginning, ie, the limit screws. It's really not hard to do and it's quick if you know what you're doing. The rear derailleur has 32 settings to fine tune. And while you're at it, check everything on the front derailleur, but make sure you read the instructions. As noted, di2 doesn't let you go little-little, although it is possible to override that setting.

Sergio_CH

Thanks, Dean.
For all the shifting in the back I was always on the largest front sprocket, just wanted to clarify that. While on largest front sprocket I could shift from next to smallest to largest rear sprocket and back, but not to smallest sprocket.
Which one is the limit screw, please?

August West

It sounds like it is mis-adjusted by 1 cog since when you are in the large cog if you try to downshift to a lower gear it shouldn't do anything or make any noise. It is hitting the limit screw (good!). It thinks it is in the next to the largest gear and also why it won't shift to the smallest cog.

The Shimano manual gives you step by step instructions on how to properly adjust the derailleurs. Really easy to do once you get the hang of it.

R8050 Ultegra Dealer Manual

GeneO 

Was kind of hard to follow what you were saying. You can adjust the delimiter and offsets electronically.

cb400bill

This it normal for Di2. On mine, if I am in the small front chainring, my bike will not shift into the two smallest rear gears. Di2 is set up to not allow cross chaining.

Steve B.

Its an easy answer, but it’s also found here and I’d suggest reading it as it’s stuff you’ll need to know..

https://si.shimano.com/pdfs/dm/DM-R8050-02-ENG.pdf

August West

I'd also suggest not crossposting identical posts in two different forums.

bahula03

If you have access to one with everything going on, it'd probably be a very good idea to take it to a local shop and have them take a look. There's a chance the limit screw is set incorrectly (easy to google how to adjust it), but it also sounds like the derailleur hanger could be out of alignment, which isn't unusual but also isn't easy to fix without the correct tool. It could also be a combination of all three; limit screw, derailleur hanger, and the indexing being off. Hard to say over the internet.

Given that it sounds like things are indexed to the left by a whole gear, which creates an extremely hazardous situation if you go small ring+largest cog in the cassette and accidentally shift up again, I'd let someone with more experience sort it for you. As others have said, Di2 defaults to preventing cross-chaining, but it should absolutely allow you to engage big ring up front and smallest cog on the cassette.

cb400bill

Duplicate threads merged.

Sergio_CH

First of all, thank you all for helping me to learn to operate Di2. That is what I want to do, so that I do not have to drive to a bike service every time.

@GeneO: I did not intend to be rude, apologies. BTW, Gear Position Control works, I checked, being on big front sprocket could not shift to smaller one while being on next-to-smallest rear sprocket, which then jumped 2 up, just as in manual.

@August West: yes, it was late and I posted in the wrong topic somehow, which I mentioned there as well, then I duplicated the same here to get the answers, now posts are merged, thank you cb400bill. :-)

I am talking to Terry from di2center.com. He answered to me at 2am! That is "customer" service, and I did not even buy anything from him! :-D

Anyway, I am in the E-Tube and I see that Di2 thinks I am on the smallest sprocket, while in reality I am on the next-to-smallest one.

Cannot post screenshots yet but I see in E-Tube that:
Adjustment setting value is 0
Rear derailleur gear shifting position is 11

Steve B.

Adjustment setting value of zero is the neutral setting for the derailer on the cogs. Zero doesn't indicate correct and you make adjustments to this based on the instructions I linked above and listening to the chain as it rubs on the next largest cog while changing the setting using the shift buttons. It's in the manual

If the systems thinks the derailer is on the smallest cog and it's not, than either the high stopper bolt is set incorrectly and is preventing the derailer from moving the chain to the smallest cog, or the derailer hanger is bent.

Sergio_CH

Thank you, Steve!
Hmm, I think I have to bring it in to a service, not sure if I can check if hanger is bent. Looked from the rear and I think it is bent towards the wheel, but maybe it is supposed to be like that.

Sergio_CH

The reason for my problem:

1. Bent hanger
2. Adjustment on RD was not properly done

Everything now works on the repair mount, but haven't ridden the bike yet.

Cheers, everyone!

Steve B.

[QUOTE=Sergio_CH;21450464]The reason for my problem:

1. Bent hanger
2. Adjustment on RD was not properly done

Everything now works on the repair mount, but haven't ridden the bike yet.

Cheers, everyone![/QUOTE

Good to hear !, glad you got that resolved.

Enjoy the bike and system and a thank you for the follow up on progress, folks tend to not do that.

Sergio_CH

My pleasure!
I was worried it could be hanger out of spec, Terry from Di2 Center told me he had a case like that.
But I also read on another forum that bent hanger is the most common culprit for messed gear changes, apparently very soft material those hangers.

Iride01 

Probably better that the hangar bend than bending or crushing the Derailleur.