Originally Posted by
noglider
dddd, I have used a Nuovo Record derailleur with a 14-28 freewheel with good results. It depends on luck somewhat.
Too many of us to mention have done this, perhaps some even stretching to 30t???
Where things go downhill is when trying 28t with even a 39-52t in front, suddenly it doesn't want to work any more.
That's where a sprung upper "B" pivot comes to the rescue, accommodating the extra chain take-up with ease.
Some say the Super Record mech gives a little more, can someone confirm?