East of Auckland near Thames, the Morototo - Wires Track area has several 4WD tracks open to offroad motorcycling. While Wires Track is the easier of the two, the Morototo Loop has many bog crossings, river crossings, and rocky sections.
To reach the trailhead from Thames, head south for 10km. It is located about half way between the towns of Thames and Paeroa.
Note: It is best to ride this area when dry, and even then, do not ride alone.
Overall, Morototo - Wires Track is the 30th most popular dirt bike trail of all 41 dirt biking rides in New Zealand.