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Old 05-21-12, 10:01 AM   #1
georgiaman
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Flip Flop hub to geared.

Is it possible to switch my flip flop ss/fixie hub to a geared hub. I have a 6 speed cassette and a Shimano 600 rear derailer. If so how easy would it be to do that?
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Old 05-21-12, 10:21 AM   #2
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I imagine that there aren't enough threads to accommodate a freewheel. You would also have to respace and redish the rear wheel, which was not really meant to have the tension differences in the spokes. It'd be easier and cheaper just to find a rear wheel that can take a freewheel...
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Old 05-21-12, 10:33 AM   #3
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Put the Shimano 600 hub and cassette in the frame to see if it fits. If it does, get a set of DMR chaintugs with built in derailleur hanger. Run a full length cable housing from the shifter to the derailleur. No cable stop is necessary if done this way.

Sunrace makes clamp-on downtube shifters but you'd have to find a clamp-on cable stop for the chainstay and you'd have to install a cable guide to the underside of the bottom bracket.

If the hub doesn't fit you can spread the dropouts a little if it's a steel frame but not aluminum.
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Old 05-21-12, 11:31 AM   #4
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Quote:
Is it possible to switch my flip flop ss/fixie hub to a geared hub. I have a 6 speed cassette and a Shimano 600 rear derailer. If so how easy would it be to do that?
.. you begin by buying another wheel..

Your frame already have a derailleur hanger dropout?

No? I'd suggest a IGH, instead,, like Shimano's Alfine 8,
or Sturmey Archer's 5 speed.

Last edited by fietsbob; 05-23-12 at 12:07 PM.
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Old 05-21-12, 11:38 AM   #5
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Yeah the frame is a Surly Cross Check. So it has a derailleur hanger and down tube hangers. I also have a set of downtube shifters and cables ready. See I bought the bike from ebay and it came with the flip flop and in addition it came with the shimano 600, cassette, and front shimano 105. Im just trying to figure out if i'm going to need a new rear wheel to put the cassette on with or if I can take the flip flop off and just put the cassette on. Thanks for the help guys.
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Old 05-21-12, 01:45 PM   #6
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Flip flop hubs use single speed freewheels that are threaded onto the the non-fixed side, so your cassette is a NOP. Remove the single speed freewheel, find a 5-, 6-, or 7-speed freewheel, and see if that fits. If it doesn't, find a new rear wheel.
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Old 05-21-12, 04:29 PM   #7
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Ok, now I understand better.

The cassette won't work but a spin-on multi-speed freewheel might.

I asked an experienced mechanic this same question. He said that the threads on the freewheel side are not as deep on a flip-flop hub as they are on a hub designed for spin-on multi-speed freewheels. The threaded end of the hub might shear off.

I'd just look for a used road or 29er cassette wheel. The rear spacing is 132.5mm on the Cross-Check so either will fit.
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Old 05-21-12, 04:51 PM   #8
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Thinking about the hassle of setting the washers for proper offset of the axle and redishing the wheel would be enough to get me to start scouring craigslist.
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Old 05-21-12, 06:37 PM   #9
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Sweet thanks for the help guys!
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Old 05-21-12, 06:42 PM   #10
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Originally Posted by georgiaman View Post
Is it possible to switch my flip flop ss/fixie hub to a geared hub. I have a 6 speed cassette and a Shimano 600 rear derailer. If so how easy would it be to do that?
You can install a freewheel on either side of a flip/flop hub, but you will likely need to move some spacers around and re-dish the wheel to get sufficient clearance for a 6-cog freewheel to work.
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Old 05-22-12, 07:52 PM   #11
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Not so. The lock ring section of the fixed gear side is reverse-threaded.
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Old 05-22-12, 07:58 PM   #12
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That's such a nice bike; I'd find the right rear wheel for the bike. I'm not sure if I'd recycle that 6 speed cassette unless funds were really tight; 7s, 8s, and 9s are easy to find and will give you better gear ratios. If you are going to the trouble of doing all that work, you might as well set it up in a way that makes sense for your needs.
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Old 05-22-12, 08:14 PM   #13
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Quote:
Originally Posted by oldbobcat View Post
Not so. The lock ring section of the fixed gear side is reverse-threaded.
It's also a smaller diameter than the cog threads which are the same as the freewheel which wouldn't interfere- the freewheel would thread right over the lockring threads.
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Old 05-23-12, 09:58 AM   #14
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The easiest thing would be to replace the wheel with a wheel that has an IGH hub. See the Mercier in my sig to see how I did this on a bike with track ends.
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Old 05-23-12, 12:12 PM   #15
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flip/flop hubs are wider than derailleur - freewheel hubs, the gears take up more right end space.
so hub has to be narrower.., cassette hubs, too,
the right flange is closer to wheel the centerline,
because the greater spoke tension pulls it that way.
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Old 05-23-12, 08:36 PM   #16
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You can install a freewheel on either side of a flip/flop hub, but you will likely need to move some spacers around and re-dish the wheel to get sufficient clearance for a 6-cog freewheel to work.
Quote:
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Not so. The lock ring section of the fixed gear side is reverse-threaded.
The lock ring section on the fixed gear side is a smaller diameter, so a freewheel will install right over it without engaging the reverse-threads at all.

Try it yourself -- you'll see.
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