rec.sport.unicycling · Public discussion

crank arms

Started by happysquidman · · Last activity · 23 posts · 895 views

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rec.sport.unicycling
Published
23 October 2004
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24 October 2004
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happysquidman
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  1. is there anything that can be used to stop the cranks from scratching
    when doing grinds and crank grabs?

    --
    happysquidman - Unicyclist and Dude

    Dude....
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  2. yes

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    total uni - bikes suck-unicycles rule
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  3. Happysquidman, when I first started grinding and pedal grabbing I asked
    the same question. However, I soon learned that trying to protect you're
    cranks is a waste of time. It's inevitable that they will scratch, chip,
    and dent. Don't worry about it.

    On thing that works well for protecting the paint on your frame is Satin
    polyurethane. I put 3 or 4 coats on my frame after I re-painted it and
    sratching has been kept to a minimum.
    Goodluck.😉

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  4. Theres no real point in protecting the cranks, and if you really wanted
    to you could repaint them or chrome them, but there is no point. You
    could weld a small plate to the bottom of your dominant crank but it
    would probably get in the way and cause nothing but trouble. So "NO"
    there really isn't anything that you can protect your crank with. Total
    uni, *sigh*.

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  5. Yea...I powdercoated a pair of KH cranks that get used A LOT for crank
    grabbing, and that held up well for a few weeks, but now they're
    trashed.

    It isn't really worth protecting them too much, as the friction and
    slamming of the grabs just annihilates everything.

    I think chrome may hold up pretty well for a while, but it will, like
    everything else, eventually get ruined.

    Focus on what you're doing with your cranks and not what they look like,
    so to speak.

    --
    digitalattrition - Hand Signals are Key

    "Ok, I think if you just pull off of that guys bumper, we'll be ok"
    --Tim to ShadowUni after parallel parking.

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  6. "duct tape"

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    total uni - bikes suck-unicycles rule
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  7. Catboy and Total-Uni, will you please stop wrecking every thread?
    You two sound like my 8 and 9 year old cousins. To bad we can't
    institute a 50 foot seperation rule.

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  8. uni412 said:

    *Catboy and Total-Uni, will you please stop wrecking every thread?
    You two sound like my 8 and 9 year old cousins. To bad we can't
    institute a 50 foot seperation rule. *


    Don't demean me to a lower level because I correct the obvioulsy
    wrong... It's no offense to to total uni he just needs to lear to think
    before he speaks(or types)

    --
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  9. will the scratches make the cranks not work or make them not as strong?

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    happysquidman - Unicyclist and Dude

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  10. Nah, the scratches don't effect the cranks performance.

    That is unless you crack the crank and you just think it is a scratch,
    but that hasn't happened to me before, so I dunno about it.

    --
    digitalattrition - Hand Signals are Key

    "Ok, I think if you just pull off of that guys bumper, we'll be ok"
    --Tim to ShadowUni after parallel parking.

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  11. happysquidman said:

    *will the scratches make the cranks not work or make them not as
    strong? *

    The scratches are just miniscule shavings of pait and metal, and wont
    affect it whatsoever. But you will probably not get cracks just from
    grinding, unless they are pretty cruddy cranks.

    --
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    [image: http://pics.xs.to/pics/04063/catko.jpg]
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  12. But if every time you do a grab or a grind, and you take off some of the
    metal, won't the crank get slowly weaker because layers of metal are
    disappearing?

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  13. Sigurd said:

    *But if every time you do a grab or a grind, and you take off some of
    the metal, won't the crank get slowly weaker because layers of metal
    are disappearing? *

    I guess eventually it would but you would literally have to grind about
    a mile before it wore down any...

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  14. i must be weird, but when i bought my cranks i intentionaly got black
    ones so they'd get all scratched!

    its not yout cranks you have to worry about though, its the bearing
    holders and hub flanges.

    actualy my cranks are a bit wrecked now, but they are profiles, so what
    the hell!

    --
    evilewan - death or glory

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  15. Yea, can't grinding pop spokes and stuff if you don't do it correctly?

    --
    digitalattrition - Hand Signals are Key

    "Ok, I think if you just pull off of that guys bumper, we'll be ok"
    --Tim to ShadowUni after parallel parking.

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  16. So far I have only scratched up my bottom bearing housing and removed
    some paint and scratched the cranks and pedals. In a month or two I am
    probably going to have to replace the housing, just so it doesn't break
    but I would say that 3 bucks is more than a fair price. But I suggest
    getting smaller housing screws, because I have fallen because the screws
    on the housings grabbed...

    --
    Catboy - I enjoy the taste of dirt!

    [image: http://pics.xs.to/pics/04063/catko.jpg]
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  17. Catboy said:

    *... you would literally have to grind about a mile before it wore
    down any... *

    C'mon catboy, could you stop pulling facts out of thin air?! On solid
    steel cranks, grinding won't damage them much at all. On painted hollow
    cranks like Onza and black profiles, you really can weaken the crank
    enough for it to break, but it takes a long time. Noone knows how far or
    long you'd have to grind before it'd trash your cranks. It depends on
    the material of the ledge or rail and your crank. I asked Dan Heaton if
    he's ever ground through a set of cranks, and he hasn't. I'm sure he's
    effectively done around a mile of grinds.

    I would be seriously surprised if you had to replace the housing on the
    yuni frame. I've been pedalgrabbing, crankgrabbing, and grinding for
    around a year, and my Onza housings are fine. If it really is that bad,
    simply revers which housing is on your grind side.

    digitalattrition: I've never ground a spoke off grinding, but something
    to be careful of is on big pedal-gaps or grabs onto rocks, you can have
    a piece of the rock smash into a sopke onyour wheel. This has happened
    to me, and first it bent the poke, and then, finally, the head of the
    nipple sheared off. I think if you have a fat enough tire, it protects
    from the spoke heads from shearing off.

    I think that your crank will be worn oout or broken by spline wear or
    metal fatigue long before grind damage becomes a factor.

    --
    gerblefranklin - Trials Unicyclist

    Don't you think it's a cruel irony that acting like a G.I. Joe in the
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  18. I never siad it would damage any, I was just giving an example to state
    that you probably won't grind down cranks, before you bend/break them.
    Chill.

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  19. I remember several threads about Onza cranks that got smashed during
    pedal grabs. If my memory serves, some people had problems with the
    axle bolt getting smashed, thus making it impossible to remove the
    crank. I believe the Bevan had this problem.

    Dan

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  20. yeah. I have smashed my cranks enough that the dust cap has had material
    kinda merge with the bolt. It makes it so I can't remove the dustcap or
    bolt, but the crank can still be removed. That's just a weak point of
    the Onza design, although I guess that is proof that grinds can damage a
    crank, although it hasn't weakened mine any. Trip has bent his Onza's
    and damaged the bolt enoguh that he can't tighten his left crank. I've
    never seen this happen with any other crank design except for a set of
    profile dirtjumpers where the bolt was so reccessed that the metal
    ovalized around it making it impossible to get the bolt out.

    --
    gerblefranklin - Trials Unicyclist

    Don't you think it's a cruel irony that acting like a G.I. Joe in the
    army can get you a Medal, while playing with one can get you thrown
    out?

    http://gallery.unicyclist.com/Trials-Muni

    "Our enemies are innovative and resourceful. They will stop at nothing
    to hurt us and our people, and nethier will we"-Dubya
    Vote Kerry. Yeah, they both suck, but Kerry sucks less.
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