I have the 15 tooth AC racing freewheel. It's quiet, actually weirdly quiet, makes me think its not working right but I have no actual basis for this. I've only riden it for about an hour so I cannot atest to it's durability. It also uses the Shimano BB tool (big selling point for me)
Cheers
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I'm not one for fawning over bicycles, but I do believe that our bikes communicate with us, and what this bike is saying is, "You're an idiot." BikeSnobNYC