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I found the noise! The drive clutch has serrations. The "race" in the hub shell does not -- from the factory. But in the noisy hubs, there are serrations in the hub shell "race". The drive clutch has "tooled" serrations into the hub shell. I might call this brinelling, even though brinelling...

Whoa! I have exactly this noise problem with my fleet of Huffy Cranbrooks! (Yes, 16 of them. Burning Man bikes.) They make a buzzing grinding sort of noise when coasting. It goes away when I pedal backward a little bit, but people cannot be expected to do that. I also do bike repair at Burning...

:D Hi folks! The silver-bodied trike with the sprint car tires did indeed float. We rode/sailed it to the other side of the river, turned right (upstream) and looped back to the beach. The delay was caused by Stupid Me initially installing the wrong gear. (Gears can only be changed by...