for the founders -- if you're building a bike whose USP is built-in bike-based routing -- im surprised you're using out-of-the-box google directions. Have you considered using something like OpenStreetMap based routing? Perhaps incorporate hills? Perhaps allow users to modify the map and incorporate trails that they take regularly?
Here is a good example:
https://www.mapbox.com/blog/launching-smart-directions/
But overall looks like a cool concept, and the bike looks slick. Congrats!