My Di2 rear derailleur stopped working properly. It shifts down without any problem, but once at the smallest cogs it only goes up one gear and then makes a noise like “tac tac tac”.
When resetting the derailleur by pressing on the button of the junction box the same happens.
The guy I usually take my bike to repair says he always recommends to change the part with this problem.
However, for me if the derailleur is capable of shifting up one gear it should mean it is not mechanically broken.
Does any one have any suggestion?
Thanks!
This… the ticking sound it makes means that it cannot move into the gear.
Usually this means that it’s blocked (limits set incorrectly, chain too short, etc.), but if the system has been working fine so far, then it usually means the RD has to be replaced.
If you take the wheel off and you ‘help’ It by gently pushing it in the right direction it’ll probably shift, but obviously that isn’t a real solution
yep same here. R8050 cooked. for months it was kinda ok then after about an hour of riding it would only shift up to the middle cog and go no further. next ride it was ok. gradually got worse.
it’s perhaps worth saving the hanger bracket bit and the cage as spares.
i got a replacement from amazon.it which was bizarrely much cheaper.
Not a chain length problem, not a limit screw problem, not a cleanliness/lube problem, not an indexing problem - actually there was zero adjustment in the e-tube app on the position it was super-true and undamaged on the outside. Just cooked on the inside! GBp250 ouch (GS cage)
Anyone have any more experience with this? I’m going onto my fourth grx di2 11 speed rear derailleur and am starting to lose my mind. I barely get 1000 miles out of each.
Anyone? I’ve got a pile of derailleurs that don’t work and really bummed out. Is the servo dead? or is there something putting resistance on it?
I refuse to buy another, but wondering if there is any chance that battery is fried? Diagnostics look fine. Although I cant check since they don’t do E-tube on mac OS, and I dont have the wifi dongle.
Check/clean/service the clutch mechanism. 1k miles is a really low amount but every 11 spd Shimano clutch derailleur eventually exhibited an issue shifting to easier gears.
Funny enough, I just found this as a potential issue. Which would be insane if I spent all that money for a dirty clutch, something shimano never recommended. One of them didnt work even with the clutch off, but maybe a separate issue. Seems like they dont have any extra capacity in these servo motors.
Thanks! The bike has done some muddy CX races in those thousand miles.
