Clarification on adjusting rear derailleur

[satrapes]

Hello i would like to ask you when you set the rear derailleur the front chain rings at which ring should they be? Largest diameter medium or small? (The question is obviously for bikes with 3 chain rings). Thank you in advance.

[cyclerUK]

I would use the middle one. Then re-check on the others.<br />
They should all work on a good set up, but the chain will be under strain when going big front to big rear and small to small.