If you are looking at a full sized bike, these seem to have the best reputation and performance. Front and back tyres are identical (standard 21 inch trailbike size) There appears to be a NZ rep. Some good NZ YT footage too.
This YT shows how close in performance the Sur Ron is to a high performance 2 stroke 250:
https://www.youtube.com/watch?v=3vcHRgAbzMw
30-40 mile range. 7.5K ish NZ
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