[quote name='swee'pea99'] it's much more likely that you have 52/42, in which case you could make a significant difference by changing for a 53/39 setup, which isn't hard to find.
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53/39?
She said she already had a 50/34
I never have to walk a hill. But then I'm a lifetime long-distance cyclist capable of riding 400 hilly kilometres in a day... and 39 would never do for me. Neither would I have use for a 53-tooth big ring. I bet a beginner wouldn't either. 53-tooth rings are for racers and time-trialists, IMO.
If we're talking double, then a 34/50 compact is the way to go -- which as we've already acertained, is in situ. But I'm partial to triples, which keeps the shifts crisper (closer together) and allow even smaller "granny" rings. I love my granny. Hardly ever visit, but always know she's there when needed.
For a beginner, a 24 or 26 is great. Lots of those around at a reasonable price -- Shimano, etc.
Campag, go 30-40-50. Other (Shimano, Sugino, etc) will allow, say, 24-36-46. That's a nice setup.
Rear: get a long-cage derailleur and a 12 or 13-32 or 34.
Bring on the hills.