In reply to gethin_allen:
Feel free to hit me up for info, I live in Christchurch, and do a fair amount of local riding, and have done some of the longer trails, and aim to get more into bike packing here.
The Ghost Road is the hottest new trail on the West Coast, soon the be followed by the Pike River trail, and te Heaphy Great Walk is open again to MTBers 6 months of the year, all good trails.
There’s a lot of potential here, and it’s getting increasingly popular. Your aren’t allowed to just bike on any existing walking trails though.
There are a number of easier bike trails too, mostly gravel trails, a bit of road, but through some great scenery, like the West Coast Wilderness Trail, Alps to Ocean, the Otago Rail trail, and the Little River Rail trail. These are pleasant non-technical trips.
Then there is a large amount of technical day riding round the country, with centres like Rotorua, Queenstown, Nelson and Christchurch particularly good for. We are just about to get our downhill, chairlift serviced park back up and running after it burnt down in the hill fire.
There are companies that do self guided servicing of some of the trails (DOI, my partner works for one), the various trail centres will have bike hire, and there are a few companies that do longer bike hire.
I don’t like road riding so much here, though it’s popular. There is very little tolerance from drivers to bikers, and the standard of driving is low (double the road deaths of the UK per capita.) I’d recommend string together a trip from a number of the off road bike tracks, in different parts of the country.
There are good bike trail books, written by the Kennett Brothers, divided into North and South Island.