MTBing in Taoyuan area

Does anyone know if there are any MTB tracks in the hills around Taoyuan, in particular the north/west area of Nankan? (behind Taimall where the numerous golf courses are)

I took a look at formosanfattire.com, but most of the trails are either Taipei or down south.

Cheers

Register on the forums and post a message at formosanfattire.com - I am sure someone will be able to hook you up.