I checked out the Scootworks site and looked at their Hayabusa conversion. I was surprised by how narrow the belt was. Narrower than what is commonly seen as OE on big cruisers. It appears perhaps it is compensated for by having longer "teeth" in the belt. The burnout video didn't really impress me much though... the belt only had to take the initial shock load of breaking the wheel loose, after that it's not that different from cruising down the road. If they campaigned it for a season's worth of racing and didn't have any issues, that would be much more impressive. Call me skeptical, but I'd like to see more testing before I'm sold. The price seems pretty reasonable, $550 for everything you need to change over.