Bike fit / correct riding position

Not necessarily damaged (besides the chronically bad hamstrings) but the cycle fit did transform my riding - more power now, stronger legs and generally fitter core.

As a result I really enjoy riding a lot more. So it was worth it for me.

A-ha, now this kind of answers my question - from this I presume that though I may not be damaging myself by riding a too-large frame (no chance of hunched shoulders!) I may not be getting the most efficient ride.

I don't ride a frame that's too large because it's *cool *though, or for any other reason than because that's what circumstance landed me with. beggars can't be choosers!

Incidentally, my road bike, which is this right size for me, does give me pain, maybe through poor set-up. But that's my problem, and completely unrelated to my initial question.