Any idea why Harley doesn't use these stock? Just curious as a friend of mine has a Yamaha Roadstar and it has gear drive. I believe the Roadliner does as well. I suppose there could be a few reasons Harley doesn't. Engine noise is probably certainly one of them as that Roadstar has a lot of mechanical noise. Seems to be as reliable as an anvil though. I figure it's also down to cost of production since tolerances have to be tighter for gear drive. Anyone know for sure?