I have a 13-21 Suntour Winner on my Miyata that shifts very nicely and is pretty quiet. I also have a 12-21 Dura Ace 7400 freewheel that I ran for a while. It also shifts well, and is nearly silent, even compared to the Suntour. If I wasn't keeping the Miyata all-original, I would probably swap on the Dura Ace.