Christoff Yurievich
Member
Did you change the gear cable? I normally change the cable when I change my chain, but cable stretch wouldn't explain not getting past 6th.
Are you sure you 'reset' the shifter spring before tightening the cable and re-indexing the gears? It sounds like it's effective operating range is limited.
Another thing to check is that the derailleur isn't fouling the chainstay. I had a similar problem a while ago and it drove me mad until i realised the derailleur had moved and needed a slight rotation to clear the frame. Ditto with the b-tension screw adjustment - check this.
Also, phantom shifts could be wear on the cassette, especially if your chain had stretched a lot and was long overdue for a change. Did you check the chain with a chain checker? Was it over 1% stretched? If so, the cassette is probably worn to suit the old chain, so won't ever mesh with a new chain properly.
Good luck. Gear problems are the worst.
My wife mentioned the cable as well. It's a 2014 bike, would that be necessary?