This route page needs a Mapbox public access token. Open this page's HTML and replace the placeholder pk.eyJ1IjoiYmVyaWtzZW4iLCJhIjoiY21xNjBzdzRtMDE4ZjJxcHM4NngzZG5yeCJ9.bnHl7z4nOcqL2H4jgFPE9Q string with a real token from account.mapbox.com.
The free tier (50,000 map loads/month) is plenty for this site.
Battery conservation is key if you want to complete this loop with battery to spare. The ride takes you over the Wasatch to ride the infamous WOW trail. There's nothing too tricky here but stamina is key.