I have had my Cannondale CAAD10 for around 12 months now and have struggled a little with the fit since I had it.
I bought it from Epic Cycles in Ludlow and had their proper fitting at the time.
It's a 56 frame, but I am 6'0-6'1 and my other bikes (a Charge Filter, now replaced with a Genesis Equilibrium) are a 58.
I have regularly suffered with lower back pain which I have noticed moreso on the Cannondale. This tends to be after about 20 miles. I highlighted this to Epic a little while after I had bought the bike and they suggested moving the saddle back a bit (which I have done a couple of times) and if that doesn't work, to fit a shorter stem.
I am of the opinion that the frame might be slightly too small for me.
Logic would dictate that if it's too small for me, a longer stem might help, but Epic seemed to think a shorter stem would push me more upright, thus putting less strain on my back as I'm not reaching as far.
I have checked as best I can, and the saddle height would appear to be ok, as my hips don't rock.
It has a 100mm stem on it at the moment, and I've just ordered a 90mm to give that a try.
I wondered if anyone had had a similar situation and how they solved it? Would a longer stem work instead?