Here's how the Department of Conservation describes the trail:
"The Whirinaki Forest Mountain Bike Track is purpose built and weaves through one of the most spectacular and interesting forests in the world.
"The track is designed for the eco mountain bike rider and requires a medium fitness and skill level (grade 2 - 3). The track is 16 km and most people complete it in 2 - 4 hours. Shorter sections of the track can also be ridden."