The start of the Mangapurua track is a cycling and walking route at Crotons Road, Ruatiti 4696, rated 4.5 from 2 Google reviews. It has an iconic ride through a long, remote valley that links Ruapehu with the Whanganui River, via the Bridge to Nowhere.
A remote backcountry track is judged on its surface, its length, its river crossings and how well it is signed. Long rides in remote valleys need water, food, spare tubes and a plan for the return, since mobile signal can be patchy. Check the weather and river levels before setting out, because rain can make the track slippery and rivers can rise quickly. Regulars often tell someone their route and expected return time before they leave.
For a remote valley ride from Crotons Road in Ruatiti, plan carefully before you set out.