Can anyone recommend a fairly strenous 2 - 3 hour ride in the Hamburg area. A bit of gradient would be good.
Look at the website for recommended routes done by other people. I've searched Hamburg for you.
It's all pretty flat.
I would recommend a cycle out to Rosengarten and to the Schwarze Berge hills area. There's lot of lovely scenary and plenty of other cyclists and routes.
Wonderful news - thanks! There are dedicated cycle tracks and tracks up there?