The hiper wheels probably weigh very close to the stock wheels, but they are duel beadlocks on the rears and single on the fronts. carbonfiber can give a little with out bending like aluminum wheels. hiper will give you a new wheel for free if you damage it within a year and after that it is like $30 to replace the damaged piece. (the wheels are a modular bolt togeather design) With the beadlocks, if you do happen to get a flat, the tire will stay on the rim instead of slipping off the lip. You can see several pictures of there product at hiper-technology.com They are comming out with some stronger tie-rods for quads in the next few weeks, they should be pretty cool.
Tom jr is the guy to talk to (like robertinargyle said) his mom or dad usually will answear though, he is hard to get a hold of, but is very knowelgeable. The wheels were in an article in the april dirtwheels and they are pictured on a few quads in the may issue. (pg. 168/170 on chris borich's quad and numerous pictures on dana creech's quads) the beadlock rings are available in red, yellow, blue, black and green. The wheels are indeed awesome and with there warranty, well worth the cost. I have run the douglas .190 red label wheels with the aluminum re-enforcing rings welded to both sides and bent them on one ride, and champion beadlocks are just too **** heavy. Well wory the slight extra cost for the hiper wheels.