The Ultimate Gravel Bike Build Posted on March 7, 2019 at 3:29 pm.Written by James AtkeyGravel riding has taken the world by storm, and for good reason – what could be better than a muddy ride through bridleways and gravel trails. No cars. A clear path ahead. Unchartered territory.At Tailfin, we wanted to take our engineering passion and challenge ourselves to put together the world’s best adventure bike. A dream gravel rig that can go anywhere, do anything and leave you smiling ear to ear.