Derailleur shifts problems…

a.s.

Mr. Chainring
I can go up to the low gears no problem but can’t get out of 12-11-10-9 with one click. Derailleur drops 8-1 with minimal fuss.

Tried everything but a new chainring. 🙄
 
Aside from der or der hanger bentedness, sounds like cable may be too tight, or not running free.
Try tuning shift in middle range, then see if there are problems north or south.

But yeah, prolly chainring.
 
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