metric equivalents will be ok if imperials are hard to find in new zealand,its only a fraction anyway,metrics give you a wider choice of very good tyres,i use them,i never look for imperials,sport demons and dunlop 501 are my choice if you live and ride in a hilly twisty area like me,bt45s are the old default tyre these days,you will be happy with either of the three,the bt45 gives the best mileage,i like new tyres so i dont mind ones that run shorter,i know tyres cost more your way but try and keep away from the temptingly cheap ching wa wee type brands.
