Sorry this tool so long (I was away for a week) but here is the answer from Maxxis...
It appears that you are wanting to know how Cheng Shin and Maxxis are
related. The best way I can describe the relation is that of Toyota and
Lexus. Lexus is the premium line of Toyota. Cheng Shin is the parent
company of Maxxis. Maxxis is a premium line of tires. How does Maxxis
differ from Cheng Shin you ask? All R&D on our tires are done here in the
United States, with top level racers. We have had many of our Supercross
teams, such as Moto XXX, Team ECC, Richmond Racing (Darcy Lange) help with development. We have also had top level off road riders do development as well, Robbie Jenks, Garrahan Brothers, Joey Lanza, Robert Naughton, Jimmy Lamastus, and the list goes on. Freestyle riders such as Tommy Clowers, Nate Adams, Jeff Tilton, and more. All the tires are made with the most advanced and highest quality materials and manufacturing processes. People here in our office have all been riding for many years and insure that all of our products are as good if not better than our competitors. As far as our other line of tires you can look at our ATV tires that #1 GNCC rider Bill Ballance and #1 GNC rider Tim Farr ride Maxxis. Look at the bicycle
tires top level riders like Dave Mirra, Brian Lopes, and Hans Rey to name a
few. Know that when you are riding on Maxxis tires that many other people
have put countless hours into our products to insure that they are the best
tire on the market. I hope this information has helped.