I love where you're going with this, nearly all of my little side projects have something to do with maps and bikes. No comment on how the routes are as I'm not really familiar with any good routes in bigger Euro cities, but as someone who rides around NYC a lot this would be really useful in making routes for visitors who aren't as keen on riding in NYC traffic.

Mobile needs some work. Are you planning on open sourcing this? I'm a mobile dev that might be able to clean that up a little. Good candidate for React Native.