i did that to my bike b4. its a pain in the ass when u have to take off ur back tired and put it on. and mine usually fell when i went dirt jumping.. the only reason for that is cuz he doesn't have back drop outs. and hes not riding witha drailor

 does that actually work well?

 hell yea

 can't the chainring just fall off?

 no its soooo tight

 thats awesome... and it just stays in the same spot cool

 how does it work ?

 ahahah thats fkn sweeet