Turning a freewheel hub into a fixed hub?

Good advice there from the last post. If the wheels came off an old touring bike for instance it's probably threaded. I had a similar situation to work out myself a couple of months back. My hub was threaded but rather than go for a 'suicide' hub I screwed on a bmx freewheel with 16 teeth and run it as a single speed, I'd recomend running at least one brake if you go for this option! With no wheel building skills and limited cash you can buy a cheap freewheel and the shop mechanic charged me £30 to re-space and re-dish the wheel to get a good chain line. In defence of the suicide hub? I've not ridden one but I went to the bike track today and the guy that teaches under eighteens said to go for it as long as I ran a front brake as well he claimed they never used the lock rings on there club bikes(used for teaching)?

I thoroughly recommend you run two brakes if you are riding freewheel. Even if the brake has plenty of power just takes a little water+speed+single wheel braking to send you sideways.

They probably never use lockrings on club bikes because they are for velodrome use only, where braking is thought of a dangerous (pile-ups from behind) the reason why track bikes are brakeless in the first place, back pedalling is frowned upon.