I bought an nc 24 cheap and i want to put a 60 or 70 tooth back sprocket on it to use the bike for stunting but i know this is not possible with the single sided swingarm. Anyone any ideas how to get a big sprocket on there or what back end i could use that wouldnt take too much modifying and also what is the smallest front i could use??? Any input would be much appreciated!

NC21 has a conventional swining arm and is a direct fit for the frame... uses the same size rear wheel (130/70/18) but obv conventional wheel.