My girlfriend wants to freewheel on her fixed hub?

We dont have any money to by anything really, so was wondering if it is possible to doing anything like that?

Thanks

Depends on the hub. If it's a flip-flop hub, it should have a side made for a freewheel to thread on to. Even if it's only threaded for a fixed cog, there may still be enough room to put a freewheel on, just depends on the hub and the freewheel.

As far as buying anything goes, I'm assuming you already own a freewheel. If not, you'll have to buy that. If you were asking about being able to coast with a fixed setup, then that's not going to work unless you try and backpedal with no lockring, and even then it'll only work briefly.

Sorry its a fix/fix. does this mean i cant do it?

No. Like I said, the bit that the cog threads on to may be wide enough to accommodate a freewheel. If it is, then it shouldn't be a problem.

That's true.

You can put freewheels on to FG threads. Usually there is enough thread for it to be secure.

Really FG/FG hubs are best as you can run freewheels or FG cogs on either side.

There should be plenty of thread on basically any fixed-thread hub for a singlespeed freewheel. 5-7 speed freewheels extend well past the threads on a normal freewheel hub with no hint of problems (apart from bent axles, obviously).

In summary the answer is yes. you can install a freewheel onto a FG hub.

I've got an IRO fix/fix hub with a Shimano MX freewheel on one side. Never had any problems with it.