Looked like a great trip.
Here's a little climb out of Flam up to Myrdal. You can rent bikes in Flam, ride up the valley and try this.
We were in Norway last year for some hiking, not biking. We took that train from Flam up to Myrdal and then hiked all the way back down. On the way down I took a picture of this sign. Thought it was fitting to add here.
P1050641 by
Derek and Corina, on Flickr