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Did someone drop it? Limit screws or being really fucking bent would do that.
Possible gunk in the erectronics but that would randomly fuck all kinds of shifts, not just three specific cogs. Check the limits first I guess and report back.I'm assuming of course this bike worked previously and you haven't just stuck on a chain that's way too short.
Had a bit of not-terrible weather the other day so rode outside on a bike I've not ridden for a few weeks. The biggest 3 cogs on the cassette were unreachable in the small ring. Any ideas what might be wrong as the indexing seems fine, it's just like I've got an 8-speed di2 setup