Graphopper can give you a bike route which avoids hills, a mountain bike route which doesn't and also uses unpaved roads and a road bike route which also dorsn

Graphopper can give you a bike route which avoids hills, a mountain bike route which doesn't and also uses unpaved roads and a road bike route which also dorsn't but sticks to the road. It's quite good too. I used it to plan bike trips, because it also exports GPX tracks.