Hey PF,
I have a feeling this is what you are asking:
(Again I am not a racer and feel free to correct me (anyone) if I have slipped anywhere; I have looked into it a fair bit to get a good understanding around it myself! Confusing hehe)
There are basically two categories - Championship and Non Championship.
Championship Classes:
Production Superbikes - 750, 1000, 500, 2stroke. And this is where all the big boys race like Andrew Stroud and Shaun Harris.
600 Sport Production - 600, 750, 2 cly. Is very competitive and there are some good races here like Sam Smith.
Formula 3 - 650 V twin, 400 4stroke and 250 2 stroke mainly, but there are others. Is still quite competitive and there are some KB's on this.
Non Championship Classes :
Post classic pre 82
Post classic pre 89
Streetstock - as the name suggests, stock standard 150 2 stroke 250 4 strokes, you can't have any mods here. Complete stock standard.
Bucket - mainly 100cc or less and aimed at juniors a good introduction for them 13 to 19 year olds, but I don't think there is an age restriction but size would matter here
Formula 1 and Formula 2 - I don't know much about these, but I am guessing the rules are more open and bikes are same as from production superbikes and 600 sport production.
But I think the best thing to do would actually be to take your bike out and do atleast 3 track days Puke, Taupo and Manfield and you will get a good feel of it. It's an awesome environment to push yourself and perhaps time too, you'll know where you stand.
I think and feel even Formula 3 would be a competitive environment to start with and streetstock is just the perfect place to being. Bikes are just ordinary ZXR and CBR 250's no mods, simple and easy and cheap intro to racing, from there gauge your performance and move on.
Goodluck either way, hope that info was useful

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