I have no knowledge in these things, but suddenly the bike will not shift to bigger cogs on the cassette - stops in the middle of the cassette, when I'm trying to shift to bigger cogs.
Check connections, then check connections...then re-check connections. Also asking the obvious. battery charged?
Loose wires was one of the most common things I encountered. Either bar tape too tight, or too loose.
I have no knowledge in these things, but suddenly the bike will not shift to bigger cogs on the cassette - stops in the middle of the cassette, when I'm trying to shift to bigger cogs.
Dura Ace di2