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Singlespeed & Fixed Gear "I still feel that variable gears are only for people over forty-five. Isn't it better to triumph by the strength of your muscles than by the artifice of a derailer? We are getting soft...As for me, give me a fixed gear!"-- Henri Desgrange (31 January 1865 - 16 August 1940)

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Old 01-25-08, 11:49 AM   #1
RFC
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Can you install an additional freewheel on the cog side of a flip flop hub? thx nt

nt
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Old 01-25-08, 11:50 AM   #2
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yes
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Old 01-25-08, 12:45 PM   #3
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Depends on the hub. If the other side is one single thread diameter, yeah. If it has a "ledge" on the threads, please don't. Some hubs are "fix/fix," some are "SS/Fix," and I've never seen a "SS/SS" one but I suppose they might exist.
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Old 01-25-08, 12:49 PM   #4
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Depends on the hub. If the other side is one single thread diameter, yeah. If it has a "ledge" on the threads, please don't.
How would putting a freewheel on fixed-threading not work?
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Old 01-25-08, 12:50 PM   #5
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I might be totally wrong, but I think there might be more threads for the ss side than the fg side.
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Old 01-25-08, 12:55 PM   #6
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Depends on the hub. If the other side is one single thread diameter, yeah. If it has a "ledge" on the threads, please don't. Some hubs are "fix/fix," some are "SS/Fix," and I've never seen a "SS/SS" one but I suppose they might exist.
Incorrect. You can install a freewheel on either side of a fixed/free flip-flop hub. Free/free hubs exist, but you don't need one to run a double freewheel.
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Old 01-25-08, 01:02 PM   #7
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I might be totally wrong, but I think there might be more threads for the ss side than the fg side.
So?
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Old 01-25-08, 01:05 PM   #8
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I was told by my local shop, it will work for some period of time. But in the long run it will probably fail.
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Old 01-25-08, 01:06 PM   #9
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in the long run we're all dead.
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Old 01-25-08, 01:10 PM   #10
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the cog side of a fixed/free hub will have less threads on the fixed side for the freewheel to engage on as it is step threaded and partially reverse threaded, but should still work.

free/free hubs do exist, primarily for BMX applications, but generally one side has a bit of a different diameter to run freewheels with less than 15 teeth
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Old 01-25-08, 01:23 PM   #11
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the cog side of a fixed/free hub will have less threads on the fixed side for the freewheel to engage on as it is step threaded and partially reverse threaded, but should still work.

free/free hubs do exist, primarily for BMX applications, but generally one side has a bit of a different diameter to run freewheels with less than 15 teeth
very true but ACS makes a left handed freewheel so it is possible
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Old 01-25-08, 01:24 PM   #12
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I was told by my local shop, it will work for some period of time. But in the long run it will probably fail.
It will have the same number of threads engaged as you would if you were running a fixed cog.

And if you don't believe me that it's OK, then listen to Sheldon. Don't f*&^ with the Sheldon.
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Fixed/Free model can be used with 2 freewheels if desired.
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Old 01-25-08, 01:41 PM   #13
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I was told by my local shop, it will work for some period of time. But in the long run it will probably fail.
Your shop is dumb. It will totally work. riderx is with me on this, and he has a red star. win.
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Old 01-25-08, 01:44 PM   #14
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I have run a freewheel on a fixed/fixed hub with no issues. Fixed/fixed hubs are the best when it comes to versatility.
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Old 01-25-08, 01:44 PM   #15
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very true but ACS makes a left handed freewheel so it is possible
possible for what? left handed freewheels are for left side drive applications and as such would not work with RHD drivetrains
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Old 01-25-08, 02:21 PM   #16
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Thanks all.
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Old 01-25-08, 02:22 PM   #17
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possible for what? left handed freewheels are for left side drive applications and as such would not work with RHD drivetrains
+1. Besides... I don't think there's a RHD/LHD flipflop hub out there that isn't 14mm, making it entirely useless.

and to the OP's question, I've done it in the past without any problems. Freewheels have significantly less forces at play with the hub threads compared to a fixed cog, so the threading (even if there isn't a ton) really isn't a problem.
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Old 01-25-08, 03:06 PM   #18
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i've been in the freewheel on the fixed side camp for several years. used it in races, mountain bike trails, loaded touring, no problems. everytime a shop employee told me that it was "wrong" i'd give a hearty guffaw and go order my parts online (which realistically i'd probably have done anyway).

now i am a part time shop employee, and i've seen three stripped fixed/fixed hubs that had freewheels on them. to be fair, they were stock on giant boweries (out of a probable twenty our shop has sold) and i don't think they were formula or dimension so maybe it's a hub quality issue.
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Old 01-25-08, 04:09 PM   #19
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my vote says yeah


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Old 01-25-08, 04:30 PM   #20
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I'm doing it with no problems yet. I asked the owner of my LBS what he thought and his response was "Have you ever heard of anyone having problems doing this?"

No. No I haven't. And neither has he.
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