All You Need To Know About Tyres - From NZTA.
The Official Guide to Tyres - From the New Zealand Transport Agency.
"You need to choose the tyres that are right for your vehicle and the driving you do. No tyre is perfect for all driving conditions. Talk to an expert about how and where you regularly drive so they can advise on the tyres you might need."
The NZTA website has a comprehensive guide to everything you need to know about your tyres. As the only part of your vehicle that is actually in contact with the road, it's important to understand how tread depth, air pressure and balance affect your everyday motoring and safety.