Singlespeed & Fixed Gear - Threading different?

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Sirrobinofcoxly
10-25-04, 02:42 PM
Maybe this is a newbie question, but I am building my very first fixie/SS, and I’m wondering if the threading on the rear hub is different for a fix gear and a freewheel. If so, can you put a freewheel on fixed threads, or are they pretty much exclusive?

baxtefer
10-25-04, 03:14 PM
On a fix/free flip-flop hub, the fixed side has 2 sets of threads. The cog spins on on the regular threads, but there's also a smaller reverse-threaded set of threads for the lockring. The free side of the hub will only have the regular threads.
The pitch of the threads will be the same on both sides.
So yes, you can put a freewheel on the fixed side, but you shouldn't put a track cog on the free side.
icithecat
10-25-04, 03:16 PM
Yes. No.yes.no.
You can thread a freewheel onto the 'fixed' threads. Thankfully some standardisation prevails.

Sirrobinofcoxly
10-25-04, 04:12 PM
I just got a set of Phil track hubs off eBay, and the description said that it is threaded for either fixed or SS on both sides, so I guess he means that it's fix/fix. Is it safe/practical/non damaging to put a freewheel on as a permanent side, or would it eventually ruin the threading? Is anyone else running a freewheel on their fixed threads?
fixedpip
10-25-04, 04:21 PM
The main problem is that a fixed side has much fewer threads than a freewheel side so you're whole drivetrain is now potential less secure. I ran a freewheel on a fixed/fixed hub a while back and didn't have any problems but I think a lot of depends on what hub and what freewheel.

My bike mechanic at the time was a little sketched out by the wholething.