SHIMANO Single Bicycle Freewheel Sprocket - SF-1200

If you are converting a geared bike to single speed this is the freewheel to get. Well, you can get the 16, 18, or 20T version, but you know what I mean. I went for a fairly high gear ratio of 2.625:1 with a 42/16 setup. Takes a minute to get rolling but I cruise along at 15mph without too much effort at all.As some others have mentioned, this freewhile is QUIET! I THINK I can see a little wobble but its minute, if its even there (might just be the power of suggestion) but nothing that makes me question its quality. Its smooth as hell and I love it. A warning: you need to announce your presence more because pedestrians cannot hear you coming.The biggest fault is the stupid tool required to remove it but I hunted ebay and found an old one for $5. Otherwise you gotta pony up the $20 for the tool here on amazon. Best option is probably to take the wheel and freewheel to your LBS and beg them to borrow the tool for a minute.

Initially seemed good but now seems to be at the root of a problem. In trying to diagnose a clicking noise I ended up changing my entire bottom bracket which was much more expensive that the original part purchased. Unfortunately it only became apparent after the 30 days.

The smoothness and silence was initially really disconcerting. It felt like the bike had no drivetrain, but you're moving forward when you pedal. I had to ring my bell to get noticed. However, after 2 weeks of commuting, it seems to not be as silent as it used to, or maybe It's just me. Still, the best freewheel I've had, so far.

Let me just say that this freewheel works as described! It is quiet, smooth, and does it's job accordingly.My only gripe with it is that the mechanism, dare I say it, sounds... cheap and tinny. When pedaling or coasting, it just sounds like the mechanism is not exactly a quality part. It is Shimano and I KNOW it is a quality company, but just the sound of it makes it sound cheaper than it is. Makes me feel a bit unsure of the long-term reliability.Other than that, excellent free wheel!::EDIT (June 13, 2012)::After putting the freewheel through its paces, it has broken in more and sounds considerably less tinny and more reassuring of it's longevity. I think this is going to be a promising freewheel in the long run! :)::UPDATE (August 7, 2013)::Still has been a champ! After some cleaning and re-lubing, it's running even more quiet than ever. However, word to the curious, this freewheel is compatible with only ONE freewheel remover from Shimano (which costs quite a pretty penny...). The design of the pins to remove the freewheel are not the best and can be tough to remove the freewheel if it hasn't been touched in a while (there have been a few cases of the remover pins shearing off). Please keep this in mind when making your decision as I learned the hard way when I needed the freewheel off for hub adjustment and cleaning.

Shimano is once again a great source of good parts at a good price.