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Flip flop hub question

Old 08-03-14, 01:51 PM
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autoteacher 
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Flip flop hub question

I have a tricycle with a Sturmey Archer 3 speed hub that has a cog welded to the left side to drive the left rear axle. The right side hub cog is driven by the crank pedal and so the three speeds.

Can I replace it with a flip flop hub and use a five cog hub on the right and a cog on the left to drive the axle of the tricycle? I already have the rear deraileur figured out.
From what I understand, both sprockets are threaded onto the hub with right hand threads with the fixie sprocket having a LHT lock ring.

Can this be done?

Last edited by autoteacher; 08-03-14 at 02:24 PM.
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Old 08-03-14, 02:29 PM
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Theoretically it ought to be possible, as far as I can see, and your understanding of flip-flop hubs is indeed how they're generally made, although some of them do have threads for a lockring on both sides of the hub. In your case, the drivetrain torque would tend to tighten the fixed sprocket onto the hub rather than loosen it, so you wouldn't really need the lockring on the fixed side.

As an alternative, a few years back there was a kit made to allow a sprocket to be bolted to a 6-bolt brake rotor mount on a disc brake hub, intended for converting a front disc brake hub into a rear fixed-wheel hub. If those are still available, fitting one to the disc mount of a rear disc brake hub would allow you to use a cassette hub on the rear and fit a 7-, 8- or even 9- or 10-speed rear end to the trike...

Last edited by Airburst; 08-03-14 at 02:31 PM. Reason: typo
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Old 08-03-14, 02:45 PM
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No reason why it can't be done, at least as far as the hubs are concerned. The left sprocket will still be turning to the right with respect to the hub. so RH thread on both sides is correct.

The issues to consider are how to mount a derailleur, and braking if a hub brake is being replaced.
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Old 08-03-14, 02:49 PM
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yawn deleted

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Old 08-03-14, 02:58 PM
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Originally Posted by fietsbob View Post
the RH thread on the left is unscrewing when driven , ....
This is plainly WRONG. The left side has a RH thread, and the hub is driving the sprocket (not the other way around) so you can think of it as the hub trying to screw itself tighter onto the sprocket.

RH thread on both sides is how these work.
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Old 08-03-14, 03:00 PM
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still say the 6 bolt cog is better

Last edited by fietsbob; 08-03-14 at 03:33 PM.
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Old 08-03-14, 03:04 PM
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Originally Posted by fietsbob View Post
send me a movie..

still say the 6 bolt cog is better
What's better or worse is a subject for endless debate. But the facts of thread direction and motion aren't.

My post was simply to correct a factual error on your part.

In any case, the OP asked if using a double sided or flip-flop hub was practical, and there's no (thread direction related) reason why it isn't
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Old 08-03-14, 03:34 PM
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Originally Posted by FBinNY View Post
What's better or worse is a subject for endless debate. But the facts of thread direction and motion aren't.

My post was simply to correct a factual error on your part.

In any case, the OP asked if using a double sided or flip-flop hub was practical, and there's no (thread direction related) reason why it isn't
Thank you, flip flop it is with five speeds.


Simple is what I'm looking for. (Very old Tricyle)

There is not a brake on the hub. The original caliper was/will be mounted over the left (or maybe right) wheel.
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