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Di2 sometimes shifts in to smallest cog, sometimes not

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Di2 sometimes shifts in to smallest cog, sometimes not

Old 05-08-21, 12:29 PM
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NoWhammies
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Di2 sometimes shifts in to smallest cog, sometimes not

Looking for some guidance/help. I have Di2 on my bike. Sometimes, maybe 30 - 40% of the time, when I'm in the big ring up front I cannot shift to the smallest cog on the back. The system will try to shift. I hear the 'tick tick tick' like I used to hear on my non-Di2 bike when I was having problems shifting.

But for the other 70 - 60% of the time, the chain will shift in to the smallest cog without issue.

Any ideas on a) what's causing the problem and b) how to solve it?

Thank you.
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Old 05-08-21, 01:08 PM
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Slightly bent RD hanger?
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Old 05-08-21, 02:19 PM
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If everything was working fine one day and wasn't the next, then I too will think bent hanger.

Or you've futched something up messing with your Di2 setup when you browsed through eTube project to see what it was all about.

Or, you changed out components or did something you haven't told us.

If it never worked correctly, not ever, not never. Then you need to go through the Di2 install and setup and make certain everything is correct and adjusted.
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Old 05-08-21, 05:41 PM
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I would bring it to someone with knowledge and tools on how to align a derailleur hanger first. I would also check in with the eTube project as well and make sure there are no issues and everything is properly updated and adjusted.
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Old 05-08-21, 06:29 PM
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Originally Posted by NoWhammies View Post
Looking for some guidance/help. I have Di2 on my bike. Sometimes, maybe 30 - 40% of the time, when I'm in the big ring up front I cannot shift to the smallest cog on the back. The system will try to shift. I hear the 'tick tick tick' like I used to hear on my non-Di2 bike when I was having problems shifting.

But for the other 70 - 60% of the time, the chain will shift in to the smallest cog without issue.

Any ideas on a) what's causing the problem and b) how to solve it?

Thank you.
When you are commanding that combo, what it is really trying to say is "tsk tsk tsk!" Like a poor relationship, it's using a slow passive- aggressive behavior process to wean you off from such decision making.

Or you have parts getting worn & need to do some maintenance.
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Old 05-08-21, 09:04 PM
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Originally Posted by Troul View Post
When you are commanding that combo, what it is really trying to say is "tsk tsk tsk!" Like a poor relationship, it's using a slow passive- aggressive behavior process to wean you off from such decision making.

Or you have parts getting worn & need to do some maintenance.
Wut? Big ring/small cog? I think you're confused. Or your reading comprehension is suffering.
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Old 05-09-21, 12:58 PM
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Originally Posted by cxwrench View Post
Wut? Big ring/small cog? I think you're confused. Or your reading comprehension is suffering.
the suffering happens. I've done worse tho.
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Old 05-10-21, 08:29 AM
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Originally Posted by cb400bill View Post
Slightly bent RD hanger?
Don't know why I didn't think to check that. Thanks for the suggestion.

Originally Posted by Iride01 View Post
If everything was working fine one day and wasn't the next, then I too will think bent hanger.

Or you've futched something up messing with your Di2 setup when you browsed through eTube project to see what it was all about.

Or, you changed out components or did something you haven't told us.
Yeah, it worked one day and not the next. I'll double check the hanger. If the hanger IS bent, what's needed to straighten it?

Originally Posted by cxwrench View Post
Wut? Big ring/small cog? I think you're confused. Or your reading comprehension is suffering.
Could be that my reading comprehension is toast. Or it could be my explanation is poor. Luckily some folks understood me enough to give me some tips on where to look.
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Old 05-10-21, 09:51 AM
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Lock ring loose on cassette? You took the cassette off to clean and maybe misplaced a spacer? Of course I'd think you'd have the issue on other cogs too, but maybe you do and don't realize it because at least it's in some gear for those other selections.
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Old 05-10-21, 01:20 PM
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Originally Posted by NoWhammies View Post
Looking for some guidance/help. I have Di2 on my bike. Sometimes, maybe 30 - 40% of the time, when I'm in the big ring up front I cannot shift to the smallest cog on the back. The system will try to shift. I hear the 'tick tick tick' like I used to hear on my non-Di2 bike when I was having problems shifting.

But for the other 70 - 60% of the time, the chain will shift in to the smallest cog without issue.

Any ideas on a) what's causing the problem and b) how to solve it?

Thank you.
My guess would be (a) limit screw (stopper bolt) is preventing the RD from fully moving into position, (b) best explanation is either in a Shimano manual for your RD, or this really excellent “how to” page.

It never hurts to verify that your RD hanger is aligned properly, but what you describe sounds like a limit screw that is turned in just a touch too far, but not so far it prevents shifting onto that cog. Because the screw is turned in ever so slightly, sometimes it will shift, but sometimes it won’t.
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Old 05-11-21, 08:06 AM
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Bent derailleur hanger for the win. I'll go about straightening the hanger before my next ride. Thanks for all the help/suggestions.
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Old 05-11-21, 10:10 AM
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Every time a customer brings a bike in w/ a rear shifting problem the first thing I do is put it in the stand and step behind the bike to look at the hanger. It's generally really easy to see if it's out of alignment and the more times you do it the easier it gets. If it doesn't look absolutely perfect I put the hanger tool on it. Nearly every bent hanger is bent 'in'...towards the wheel. If the shifting in the small cogs is good and not noisy but gets noisier as you shift towards the bigger cogs it can only be a bent hanger or maybe a bent derailleur. Nearly always the hanger.
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Old 05-19-21, 08:57 PM
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cxwrench Thank you for the tip/suggestion. A couple of follows up questions:

1. What cog is the chain in when you are stepping behind the bike to look for a bent hanger?
2. If you are bending the hanger 'out', can it be done safely without a hanger tool?

Thank you
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Old 05-19-21, 09:39 PM
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I like big ring/middle cog so the pulley cage is as close to vertical as possible. Yes, you can put a 5mm allen wrench into the bolt that holds the derailleur on and use the wrench to bend the hanger back. Not crazy accurate but it works.
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Old 05-19-21, 11:55 PM
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For more accurate kludging, unmount the RD and use an adjustable spanner to bend it and hold a ruler on it to check the angle.
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