I looked at Puzey's site, and saw this 300 listed. The bike is the first photo under the name XTR-4, but the specs and other links go to their 250cc bike.

http://www.puzey.co.za/commuters/index.asp

Since Puzey use both Galaxy and SPX bikes, who is making the 300? Can anyone in China get the inside scoop? It looks promising if true!! (at the very least, for those in S. Africa )