The center stand performed the same with the 21-inch front wheel, as long as I placed a 3/4-inch board beneath the feet.
However, I decided to weld two, 1.25-inch extensions to the feet of the center stand. Now I don't need to worry about placing anything beneath the center stand.
I also welded a 1.25-inch extension onto the side stand of my RX3.
__________________
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