As is said above, that thing looks to be so impractical! Rims are often dented/ buckled from trials use, so having the disc attached to it would then be losing one of the qualities of a standard disc, that no matter what happens to the rim, you still have a very good, working brake.And with todays "weight-weenies" Who would ever consider using one Seems to have a fair bit o' power in that video, mind... Oh, it's a repost btw.