In Chicago, bmx freewheels seem to die at LEAST once a winter. The seals aren't good enough, the bearings aren't buried deep enough, and they just can't take the salt and ****. Personally, if I was gonna go freewheel single, I'd use a singlespeed cassette hub (which is actually what I'm doin'). Freehub mechanisms are much more sealed and durable than a cheap bmx freewheel.