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30t would be pushing it for a short cage derailleur. You could try and use a deraileur hanger extender
Just a reminder: until 11 the measurement of the B knuckle to the top jockey wheel was almost always the same on long/medium/short cage. This is the measurement that determines if it will clear a certain size cassette in the rear. The cage length determines if a derailleur will take up the chain slack.
Eeyorecore
Carabo
.gaz.
30t would be pushing it for a short cage derailleur. You could try and use a deraileur hanger extender