Shimano 11sp STI shifter - only works 'upside down'

[NotSoBigBen]

Don't know if anyone else has had this problem .... Shimano 11sp (105 in this case) right shifter gets 'stuck'

If you take the shifter off the bike and hold it upside down it works fine 😒

Shimano shifters are not 'serviceable' IYKYK

Had some time (a whole morning) so 'tore it down', identified where the problem lies, now to find a way to solve it. Have tried a few options, works for a few shifts then stops 😒

Will have another go this morning .... anyone maybe solved it?

[DieselnDust]

Model?

[NotSoBigBen]

1 hour ago, DieselnDust said:

Model?

STR-7000

Thanks for that link! Having another go at it this morning then I'll see what might be needed

[DieselnDust]

14 minutes ago, NotSoBigBen said:

STR-7000

Thanks for that link! Having another go at it this morning then I'll see what might be needed

they have both the left hand and right assemblies available but limited stock

[NotSoBigBen]

Sorted 😎

Using a piece of elastic mind you, how well it will last remains to be seen! Will fit it to a lesser used gravel bike for now and see how it goes 😁

Lost a little grub screw during the fudging about, thank heavens for dremels. Managed to fashion something to work .....

[P Foxre]

Hi. Having the same problem! 

How did you fix it with the bit of plastic? 

[P Foxre]

On 10/3/2025 at 10:11 AM, NotSoBigBen said:

Sorted 😎

Using a piece of elastic mind you, how well it will last remains to be seen! Will fit it to a lesser used gravel bike for now and see how it goes 😁

Lost a little grub screw during the fudging about, thank heavens for dremels. Managed to fashion something to work .....

Forgot to quote you 

[NotSoBigBen]

On 5/2/2026 at 12:09 PM, P Foxre said:

Forgot to quote you 

Clearly need to strip it first .... I found instructions with a search on Google (YouTube). A bit fiddly but wasn't too bad

The problem 'widget' is the one I have pointed to here ... it sort of hangs down when it's upside down then it works but when it's 'right way' up it drops down onto the teeth. I have no idea what it's supposed to do but when I used a small piece of elastic to hold it up it shifts fine. 

It's not on a bike I ride often but I did a 90k gravel race with that shifter recently with no problems

Hope that helps, sorry i don't have a link to the strip video anymore

[P Foxre]

1 hour ago, NotSoBigBen said:

Clearly need to strip it first .... I found instructions with a search on Google (YouTube). A bit fiddly but wasn't too bad

The problem 'widget' is the one I have pointed to here ... it sort of hangs down when it's upside down then it works but when it's 'right way' up it drops down onto the teeth. I have no idea what it's supposed to do but when I used a small piece of elastic to hold it up it shifts fine. 

It's not on a bike I ride often but I did a 90k gravel race with that shifter recently with no problems

Hope that helps, sorry i don't have a link to the strip video anymore

Cheers. I stripped it down already but couldn't see anything obvious