Eight spline KH style hub

Discussion in 'rec.sport.unicycling' started by showard, Jun 13, 2004.

  1. showard

    showard Guest

    Of the various kinds of unicycle hubs that are now available I like the
    KH 8 spline the best. The way the cranks attach with a pinch bolt makes
    a lot of sense to me.

    For a long time I've had an idea for an 8 splined KH style hub that I
    wanted to build. I'm finally caught up enough with all the things in my
    life besides unicycles that I had a chance to work on two of them this

    This design isn't original - it's similar to the Muniac's "Drastic
    Lightfoot" hub in that aluminum flanges press on to the axle. In this
    design, the flanges press on to the axle over top of the same 8 splines
    that the cranks attach to. I machined the splines in the axle long
    enough to make it happen. This results in the bearings riding on the
    splines as well but I don't think it's a problem. I should also say
    that I remember Kris Holm describing a hub similar to this.

    Like they say: "a picture is worth 1000 words" so I've created a gallery
    and taken photos of the hubs in various stages of construction. The
    gallery is located here:


    Some time ago I bought several "drive side" Shimano bike cranks - cheap.
    Today I converted a couple of them to 8 spline just as a test ... I
    don't think they'll work very well since there's not enough material for
    a proper pinch bolt but I wanted to try my 8 spline broach to see how
    well it works. My plan is to convert a set of Kooka cranks to the pinch
    8 spline style. Also, I've ordered a pair of actual KH cranks to try
    with the hub.

    I don't have a picture yet but this evening I laced up one of the hubs
    with an Alex DX32 rim. Looks pretty good but I've had things that look
    good fail miserably!

    Steve Howard

    | Attachment filename: khk small.jpg |
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  2. That looks great. I really like the idea with the removeable flanges. I
    assume they are simply held on with spacers and spoke tension and no

    Anyways keep up the good work and good luck.

    TheObieOne3226 - Extreme Halfb*ker

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  3. elmer

    elmer Guest

    Hi, Steve!

    This looks intriguing! It would appear to be quite a solid connection
    to the wheel once laced up. I too like the pinch-bolt style of crank.
    How about titanium? Good work, and good luck with development! Dan

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  4. gbarnes

    gbarnes Guest

  5. GizmoDuck

    GizmoDuck Guest

    Wow Steve,

    That is BEEAUUTIFULLL!!!!

    I like the removable flanges. Perhaps it means you can machine an
    extra/upgrade flange that will allow a disc brake to bolt onto? (*hint*)


    GizmoDuck - New Zealands fastest unicyclist


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    fish, and he feed himself for life. Teach man to wheel ride, and he
    make friends everywhere, and even have lunch at their place."

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  6. daino149

    daino149 Guest

    People seem to like the removable flanges. I just like that they look
    like flowers :D

    Awesome job. I hope they work as well as they look.


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  7. showard

    showard Guest

    I have one of the new hubs assembled and swapped out with my current
    hub/crank setup. For over a year my MUni setup has been a home made
    Profile type 48 spline hub with 170mm GT branded Profile cranks. This
    setup has been just fine with the exception of some slight looseness in
    one crank if I don't tighten the retaining bolts before riding. A
    problem not unlike other Profile hubs seem to have. The first thing I
    noticed about the new hub and cranks was the lighter weight ...
    probably due to the aluminum Shimano cranks more than anything.

    This evening I did several 1 foot drops plus a couple 2 footers and
    nothing broke! Everything seems solid - even the lame Shimano cranks so
    I'll just ride it now and see what happens.

    The flanges on this new hub are removable but I'm sure it would require
    a press since I pressed them on using Loctite. I didn't intend on them
    coming off again but maybe that's not a bad idea? I definately plan on
    making a hub with a disc brake mount as Ken suggested. I think it will
    be a wide one for a Coker. A titanium axle is a definite possibility

    Like GB said, the flanges are square - not tappered in. I don't know if
    that's an issue or not but I've noticed that all my aluminum bike hubs
    are square too. The spokes seem to just wear into the aluminum where
    they contact the outer diameter of the flange. Oddly enough, the
    scalloping on the outside diameter of these flanges improve the way the
    spokes lay (see a photo I just added to the gallery) against them. I
    wish I could say that the scallops are a design feature but in reality
    they were put there just to be different. But I'll take an "accidental"
    design feature any day!


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  8. john_childs

    john_childs Guest

    Nice! I like the way it looks laced up. Those scallops are

    Did you weigh the hub before putting the cranks on and building the
    wheel? It certainly has less material than the KH or Profile because
    the aluminum hub body is trimmed down to a minimum so the weight should
    be less.

    john_childs - Guinness Mojo

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  9. showard

    showard Guest

    I weighed the bare hub at 404 grams ... or .89 pounds. That's not
    including bearings or retaining bolts.

    A new set of KH cranks came in the mail today. I was relieved to find
    that the KH cranks fit on the hub perfectly. The hub and nice new shiny
    black KH cranks look good together. The cranks are the old style with
    "nubs" - but not for long.

    My next task (after de-nubbing the KH cranks) is modifying a pair of
    Kooka cranks to the 8 spline setup.


    | Attachment filename: khk with kh cranks.jpg |
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  10. vivalargo

    vivalargo Guest

  11. doofe

    doofe Guest

    If you ever need someone to test out the other hub, gimme a set of
    cranks, and lace it up. I will be more than happy to abuse the hell out
    of them. Im a REALLY sketchy rider, and I would really put those things
    to the test. Im not saying this so much as an offhand comment, but more
    of a concrete offer. and if they hold up after awhile, I would gladly
    pay ALOT for them. but seriously, I will test the hub for you. you need
    someone who lands like an elephant, not a smooth rider who lands
    everything perfect.

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