If I knew the secret I'd apply it to my coworkers bike. He had a set of wheels built with Chris King hubs, and they sound like a Weed Eater when he coasts! Yeah, I know they are designed that way, but I could not adjust to that whine. Our normal ride has a 700' tunnel right before the turnaround point, and one day he was off the pace and I dropped him (at his suggestion). I sat down on a rock past the tunnel and waited. I heard his rear hub about 30 seconds before he appeared in the FAR end of the tunnel.