Previously, I had researched the 130/90-15 street tires available for the Zongshen Sierra 200GY-2, a predecessor of the Zongshen RX3. Here are the street tires I found with the deepest tread. Contrast these domestically available tires with the Chinese tires posted in this poll.
Shinko SR734R
Dunlop D404
Kenda K671
Perhaps the poorest choice for dirt riding.
Dunlop K627
Katoranger found this one! This tire has probably been discontinued.
__________________
Spud
"Never argue with an idiot. He will drag you down to his level, and beat you with experience."
Mark Twain
2015 Zongshen ZS250GY-3 (RX3)
2006 Zongshen ZS200GY-2 (Sierra 200)
2005 Honda XR650L
2004 Honda CRF250X
1998 Kawasaki KDX220
Mods made to my Zongshen ZS200GY-2:
http://www.chinariders.net/showthread.php?t=6894