Harris Cyclery says that a freewheel cog can be threaded onto a fixed gear thread. I was under the impression that it was a different thread. And the pictures that I've seen of fixed rear hubs have two different diameters, one for the lockring, so a freewheel would only thread onto half of them.

If its right, does that mean I can use a bmx freewheel on any fixed hub, just not a fixed cog on any freewheel hub? I want to get a hub with a fixed/free threading, but instead I could get a fixed/fixed, and still use a freewheel on one side?

Harris Cyclery says that a freewheel cog can be threaded onto a fixed gear thread. I was under the impression that it was a different thread. And the pictures that I've seen of fixed rear hubs have two different diameters, one for the lockring, so a freewheel would only thread onto half of them.

If its right, does that mean I can use a bmx freewheel on any fixed hub, just not a fixed cog on any freewheel hub? I want to get a hub with a fixed/free threading, but instead I could get a fixed/fixed, and still use a freewheel on one side?


I used to run SS on my latest fixie ride. The rear hub is a DA track hub
and I built it to run SS but now I ride it as a fixie. If you use a good hub
you'll be ok BUT if you got a cheap hub you may strip the threads on
the hub if ya really put the power to it, say on a climb.

So yes the guys at Harris Cyclery are correct.


Good day - VÈÑÍ VÍÐÌ VÌÇÍ ™.

Harris Cyclery says that a freewheel cog can be threaded onto a fixed gear thread. I was under the impression that it was a different thread. And the pictures that I've seen of fixed rear hubs have two different diameters, one for the lockring, so a freewheel would only thread onto half of them.

If its right, does that mean I can use a bmx freewheel on any fixed hub, just not a fixed cog on any freewheel hub? I want to get a hub with a fixed/free threading, but instead I could get a fixed/fixed, and still use a freewheel on one side?


I do/did on my Surly hub. It's fixed on both sides, and I used to have a freewheel on the other side, but now I just have 2 fixed cogs. It won't thread on ALL the way, but I was always told that's no biggie. Go for it. I think it's a better option than going with a fixed/free hub, because it's easier to use a freewheel on a fixed hub than a fixed cog on the free side of a hub without threading for a lockring.

Harris Cyclery says that a freewheel cog can be threaded onto a fixed gear thread. I was under the impression that it was a different thread. And the pictures that I've seen of fixed rear hubs have two different diameters, one for the lockring, so a freewheel would only thread onto half of them.

If its right, does that mean I can use a bmx freewheel on any fixed hub, just not a fixed cog on any freewheel hub? I want to get a hub with a fixed/free threading, but instead I could get a fixed/fixed, and still use a freewheel on one side?


I have three bikes with BMX freewheels threaded on track hubs. It works fine. The only issue I had was with a low flange Dura Ace track hub. The free wheel hit the spokes ends, I put a 2mm spacer on and it worked fine.. High flange hubs work perfect.

I used to run SS on my latest fixie ride. The rear hub is a DA track hub
and I built it to run SS but now I ride it as a fixie. If you use a good hub
you'll be ok BUT if you got a cheap hub you may strip the threads on
the hub if ya really put the power to it, say on a climb.

So yes the guys at Harris Cyclery are correct.


Good day - VÈÑÍ VÍÐÌ VÌÇÍ ™.

Is it a large or small flange hub. I ran into the problem of hitting the spoke heads with the freewheel with a small flange hub.

because of the great price, and good looks. They are fixed/free, but I was planning on using the bike mostly with a freewheel anyways, so I think they will be exactly what I need.