I covered the full Island from tip to base & left to right. I did find the gearing on my Brompton to be not quite suited to the mountains and hills of NZ. I was wishing I had the -12% gear ratio. Something for me to consider for the future. Also, the Tannus tyres were a little unsuited to a lot of the tracks. This again is something for me to think about next time I go to a ride in an area that is less urban.
One day I must return and ride the South island as many people have told me that is it even more spectacular. I will however make sure the Brompton is more suited to the terrain.
I would highly recommend a trip to NZ with your bike but be prepared for the terrain by either having an MTB or a well suited Brompton.