Alright alright! I get a chance to flex my quad knowledge!
Although this is very cool looking at a glance, I have to ask myself if it would perform any better than a normal racing atv. The only setting that I can se it being better in would be in turns on a paved surface. The skinnier tires wouldn't have as much of a problem with binding compaired to the wider tires. But that is the only advantage I can see.
Sure, it's light weight- but the engine looks to be anywhere from a small 100cc 4 stroke to possibly 250cc (at the biggest). This puts it's power range somewhere between 10 and (stretching it alot) 25hp.
I don't even thing it would climb rocks better. I guess it would have a good bit more ground clearance, but if I was playning on rock crawling, I'd want independent rear suspension.
JP