Front disc -to- Fixie only hub- Mtbr.com
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  1. #1
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    Front disc -to- Fixie only hub

    A year ago, 63xc.com showed a neat fixie hub made from a rear disc hub, and I thought, why would I want to do that? Well.. fast forward, and now I've stripped the cog threads on 2 hubs riding a fixie off road. The problem is a fixie cog only has half the threads that a freewheel has, and you tend to run a lower gear ratio than the roadies, and they strip the threads once in a while... so here's my solution.

    Take an old front disc hub that has a threaded axle, preferable 10mm, and Shimano. Take out the axle, and replace it with a Shimano rear solid axle, using the existing cones & re-space it for 135mm (or 130, or whatever) with the hub flanges centered.
    <img src="https://gallery.consumerreview.com/webcrossing/images/axiom_fixie_spaced.jpg">
    In this case I found a Axiom/Fomula hub from a lbs' used junk bin for $10. Although the axle was 10mm, one of the cones was press-fit to a flat on the axle, so I had to shim it onto the shimano axle (a good use for used Guiness cans!).

    Now as with the 63xc.com article, take a bmx cassette cog and drill it for the disc mount holes - I used a Ti Spicer spline cog because Ti was easier to drill than steel. It also has an offset so it was easier for me to get my chainline to the big ring position. And it needed to be lightened.
    <img src="https://gallery.consumerreview.com/webcrossing/images/spicer_cog_drilled2.jpg">
    You can also use a pre-made one from Boone (https://forums.mtbr.com/showthread.p...ight=Boone+Cog) - mine hasn't arrived yet.

    Now bolt this onto the hub, and...
    <img src="https://gallery.consumerreview.com/webcrossing/images/axiom_spicer_cog_fixie.jpg">

    Stick it on the bike...
    <img src="https://gallery.consumerreview.com/webcrossing/images/TiHag_axiom_spicer_fixie.jpg">
    ...and you have a nice clean fixie only setup! And hopefully no more stripped hubs...

    For chainline adjustment, you can dish the wheel (I made mine symmetric) or add spacers to the cog. So far so good - time will tell!

    Cheers,

    Tom

  2. #2
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    Nicely done

    If I ever decide to try fixed off-road riding (which I won't ), I'll know how to go about making a stout wheel.

    Anyway, good job.

    --Sparty
    disciplesofdirt.org

    We don't quit riding because we get old.
    We get old because we quit riding.

  3. #3
    KgB
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    Awesome

    thanks for the info,It looks like I have a new project.
    I've been inside too long.

  4. #4
    Single Speed Cyclist
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    Centering the cog?

    How do you go about centering the rotor as a template to drill the cog? I guess one slip and you have a rear Biopace cog.

  5. #5
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    Quote Originally Posted by SS Ryder
    How do you go about centering the rotor as a template to drill the cog? I guess one slip and you have a rear Biopace cog.
    I was lucky... I just used a disc rotor as a pattern (as in 63xc.com), pre-punched the centers and used a drill press, came out very close. 6 random errors tend to average out anyways. I might have had more problems with a steel cog. Also, the Spicer cog's spline centre fits snuggly over the ridge on the hub rotor mount, self-centering the cog.

  6. #6
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    Quote Originally Posted by Sparticus
    If I ever decide to try fixed off-road riding (which I won't ), I'll know how to go about making a stout wheel.--Sparty
    Hey Sparty, I never really considered off-road fixie until our Annual Winter Solstic Ride 2 winters ago (sort of an anti estabishment - brake the rules ride - with rules like "if you dab, go back to the begining and re-start the ride", "no light above 3Watts allowed" etc...), and since my office mate was riding a fixie to work (road) and I had a flip flop hub already... I don't think I've laughed so hard on a ride, made me smile more than I usually do. The rest is history...

  7. #7
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    If I sent you the materials, could you do the same for me?

    Quote Originally Posted by itsdoable
    I was lucky... I just used a disc rotor as a pattern (as in 63xc.com), pre-punched the centers and used a drill press, came out very close. 6 random errors tend to average out anyways. I might have had more problems with a steel cog. Also, the Spicer cog's spline centre fits snuggly over the ridge on the hub rotor mount, self-centering the cog.

    I (unfortunately) don't have access to the tools necessary. I'm working on building up a "cheap" mtb fixie and with what you said about stripping hubs, I got a little nervous. So, I'd like to spend the money on this rather than on a fixie rear hub!

    Thanks!

    KavuBiker

  8. #8
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    Quote Originally Posted by KavuBiker
    I (unfortunately) don't have access to the tools necessary. I'm working on building up a "cheap" mtb fixie and with what you said about stripping hubs, I got a little nervous. So, I'd like to spend the money on this rather than on a fixie rear hub!
    Sure, however, the cheapest way is to use a steel shimano cog (~$10) and I'm not sure I can drill it accurately. I have not had the best luck drilling steel, that's why I used the Ti cog. If you want a Ti cog, like the Spicer, then you should ask Gene to drill it for you before sending it, I'm sure he would accomodate you. Or just buy a Shimano cog from Spicer and ask him to drill it. I'm confident that he would do a better job than I. (With a Shimano cog, you have to grind down the splines a bit to make them fit certain hubs).

    Cheers,

    Tom

  9. #9
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    Hey, thanx!

    Quote Originally Posted by itsdoable
    Sure, however, the cheapest way is to use a steel shimano cog (~$10) and I'm not sure I can drill it accurately. I have not had the best luck drilling steel, that's why I used the Ti cog. If you want a Ti cog, like the Spicer, then you should ask Gene to drill it for you before sending it, I'm sure he would accomodate you. Or just buy a Shimano cog from Spicer and ask him to drill it. I'm confident that he would do a better job than I. (With a Shimano cog, you have to grind down the splines a bit to make them fit certain hubs).

    Cheers,

    Tom

    Any idea on how much that is? Or should I just ask Gene @ Spicer?

    Thanks!

    KavuBiker

  10. #10
    ballbuster
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    speaking of which...

    On Saturday, I rode 18.5 miles of Anadelle with CrashAndy. He said his SS needed work, and he didn't wanna deal with it, so he brought his cyclocross fixie, crazy bastid! It certainly was an education riding behind him. I thought he was going to stack for sure, he always seems to. And yes, he rides in Speedplay Frog cleated sandals.

    With us were Impy, Aosty, Aosty's bud Eddie from NY, and Kristina who was out of this shot.


  11. #11
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    Quote Originally Posted by KavuBiker
    Any idea on how much that is? Or should I just ask Gene @ Spicer?
    KavuBiker
    I'd give Gene a call (or email), he lists the shimano BMX dogs for $11.45. My 18t Ti cog was $36.

  12. #12
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    nice blacksmithing, might have..

    looks real solid, however, just a thought, because the spicer cog is thick, consider counterboring the holes to about the depth of a allen bolt head, makes for a cleaner and possible stronger hold..Also a little more clearance between the frame and cog..

    just my $0.02

    VernDog

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