I've had good luck with Kings Tire model KT966 front and rear. Both are trail proven and can take good loads. Rubber is good (relative to Chinese standards) and they roll smoothly. I know these tires are available in China and some places in North America. Highly recommended for the money.



Also, it comes in the sizes ya'll seem to be looking for.

Sizes:
http://www.kingstire.com/KT-966Rear.htm

CC