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Cranks rubbing frame! Help!

Started by SqueakyOnion · · Last activity · 7 posts · 270 views

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01 / Original postCranks rubbing frame! Help!SqueakyOnion · 10 Apr 2008 02 / This pagePosts 1–7Page 1 of 1 · chronological order 03 / Latest replyPost #7jamessd · 10 Apr 2008

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Original section
rec.sport.unicycling
Published
10 April 2008
Last activity
10 April 2008
Original author
SqueakyOnion
Posts
7
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Public discussion
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Topics
Electronic shifting

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  1. Original post
    SqueakyOnion
    Archived post
    #1

    So, about two weeks ago my new Nimbus ISIS 29er arrived. It's fulfilled
    all my hopes and dreams and more.

    However, there seems to be an issue. After about a week of riding, one
    of the cranks started rubbing against the frame/bearing holder thingy.
    It was causing a LOT of friction, which as we all know, isn't good.

    Looking at it, it was clear the one of the bearings had moved AWAY from
    the hub, and the other TOWARD the hub. This caused the tire to not line
    up under the middle of the frame, and created the friction described
    above.

    I took the uni to my LBS, and they took the cranks off (which I hadn't
    done yet) and carefully pounded down the bearing until it was flush
    with the hub. Problem solved! (or so I thought!).

    I just got in the mail the 100mm Qu-Ax cranks I ordered. After one ride
    around the parking lot, I love them! Anyway, I was putting them on 20
    minutes ago, and after I finished, I noticed the exact same thing...the
    crank rubbing against the frame, causing a lot of friction.

    I imagine I could take the uni back to my LBS and have them do the same
    thing again, for another $10, but *how can I fix this problem
    permanently?*

    It almost seems as if the frame fork is too wide, slowly forcing one of
    the bearings away from the hub. Maybe not though, since it still fit OK
    when the bearing was set closer to the hub by my LBS.

    I'll add photos later tonight if needed, I'm on campus right now in a
    computer lab and don't have my camera.

    Thanks for any help! 🙂
    (And yes, I searched for about 5 mins before posting - found nothing.)

    --
    SqueakyOnion

    Ever been knocked off your unicycle by a 50mph gust of wind? I have. It
    blew.

    UNT Sophomore - Euphonium Performance

    I am not a Texan. I'm a Pennsylvanian!
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  2. 1-wheeled-grape
    Archived post
    #2

    is there any spacers between the hub and bearing, and the bearing and
    the crank??

    --
    1-wheeled-grape

    Scott,

    Chris-"james is naming your unicycle a girls name replacement for
    girlfriends?"😄 😄
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  3. musketman
    Archived post
    #3

    yea...there should be spacers in there to not let the bearing move. and
    if there is spacers, one or both of your cranks must be coming
    loose..allowing the bearing & spacers and everyyything to have wiggle
    room. But i suspect you need some more spacers to not let the bearing
    wiggle around.😉

    --
    musketman

    MUSKETMAN
    www.unicycle.com
    For Sale: Parachute, only used once, never opened, small stain

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  4. SqueakyOnion
    Archived post
    #4

    I'm 99% sure the cranks are NOT coming loose. I tighten them hardcore.

    Where can I get spacers? Do I want to install them on both sides of
    each bearing? Won't the spacers rub against the rotating crank?

    I guess I'm a little confused still. The one bearing is staying in
    place just fine. The other other is moving AWAY from the hub, meaning I
    would need a large spacer to put between the bearing and the crank. But
    wouldn't the spacer just rub against the crank, too?

    I'll post pictures in 2 hours or so...

    Thanks for your help so far!

    --
    SqueakyOnion

    Ever been knocked off your unicycle by a 50mph gust of wind? I have. It
    blew.

    UNT Sophomore - Euphonium Performance

    I am not a Texan. I'm a Pennsylvanian!
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  5. 1-wheeled-grape
    Archived post
    #5

    there should be spacers on there already, i dont think you can buy them
    seperatly, if they are missing id tell udc and they might replace it

    --
    1-wheeled-grape

    Scott,

    Chris-"james is naming your unicycle a girls name replacement for
    girlfriends?"😄 😄
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  6. musketman
    Archived post
    #6

    no, it wont rub or anything against your crank. it will be smushed tight
    between your crank and your bearing, spinning with the crank as it goes
    around. So..the bearing will just spin around like its supposed to,
    inside the bearing clamps on your frame, and everything else will be
    tight in place, spinning as one. ya know? So id say just try 1 spacer
    between your crank and bearing on the side thats wiggling out. you
    might need more than 1. you should see how many are on the other side
    of your hub, between your crank and bearing. because whatever spacers
    you have on that side, it seems to be good, right?

    I might be able to tell more by the pictures to say for sure.

    and you cant buy spacers seperately, if that one side is indeed short a
    spacer causing the wiggle of the bearing. go to a hardware store or
    something. I got some extra spacers for my profile hub at an auto shop.
    they aren't specific UNI spacers ofcourse, but a spacer's a spacer.

    --
    musketman

    MUSKETMAN
    www.unicycle.com
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  7. jamessd
    Archived post
    #7

    I don't know about Nimbus 29s because I haven't seen one, however I do
    know that Nimbus 26s do not require spacers - and I'd think they're
    pretty similar? Maybe it depends on the cranks? (however I doubt
    it...).

    As a last resort, GENTLY stand on one of your frame legs and bend it
    in, untill it fits over the bearings without forcing them out of
    position.

    --
    jamessd


    Add me, but tel me who you are :p:
    [email hidden]

    Kieron said:

    I tell u wat they would have to be a very commited pedo to learn to ride
    a unicycle in order to mingle with us, steel one of us and rape us in a
    bush.


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