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trials crank length/spoke count

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rec.sport.unicycling
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17 March 2008
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19 March 2008
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tim williamson
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  1. Hey All,

    What is the most common (I know, there are always a pile of exceptions
    to every part!) crank length on trials UNIs?

    A number of years ago I lead the charge to get biketrials to use 32
    spoke wheels instead of 36. Many years ago there was a reason for more
    ..... but now the spokes and rims are so much better, the logic was
    lost. So we switched opening us up to use a much larger variety of
    rims. Similarly, is there a good reason trials UNIs are still 36? The
    spokes are so short and close together, if you run a simulation you
    have to get into the theoretical before it makes even the smallest (and
    it is small!) difference. Is is like BMX bicycles using
    36.....strictly history/habit?

    --
    tim williamson

    Enjoy,
    Tim Williamson
    NUMEN 2008
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  2. It depends on the rider preference, There is KH 137mm, there's 140mm and
    145mm. I prefer 145 mm because there is more stability but I guess 140
    mm is a good size.

    Still 36 spokes. Except Qu-ax s are runnig with 48 spokes.

    --
    Emile.m

    Ntappin said:


    I'm a butcher, and it took me like 10 minutes to get one nub off my
    luna.

    2nd *)---TreFlip-'O,

    M'y galler' (http://tinyurl.com/23w828)y
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  3. I would love to have a 32 hole hub.
    I could use the DOB Magnesium rim with no problems than....

    I prefer something between 140mm and 145mm for trials.

    --
    Smilymarco

    'Municycle.com' (http://www.municycle.com)
    Lesen -> Denken -> Posten
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  4. In my opinion the 48 spokes is mandatory if you wanna feel safe on large
    drops. E.I. 5 foot and on.

    --
    SHAY_CAM

    The only occurance of world peace is when your the only one left. 🙂
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  5. For trials, the most favorited is probally 140ish and a bit shorter for
    street. KH moments at 137mm are really popular.

    But unicycles still use 36 spoke although some use 48. A lot of people
    want unicycles to change to 32 so they can have more rim choices.

    --
    _Ground_Zero_
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  6. The only reason the 137's are more popular is because the people that
    buy those unis also do street. and longish cranks are better for
    crankflips. I want moments 🙂 im ditching those dx cranks soon!

    --
    SHAY_CAM

    The only occurance of world peace is when your the only one left. 🙂
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  7. I use 125 mm moments for street. Though i havent tried 137s much, i
    think 125s are more flippety.

    --
    peleschramm

    http://www.youtube.com/profile?user=peleproductions
    unicycle for atheism.
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  8. peleschramm said:

    I use 125 mm moments for street. Though i havent tried 137s much, i
    think 125s are more flippety.

    I admire your word ussage. flippety. i think i shall go do some
    flippetys now.😎

    --
    SHAY_CAM

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  9. SHAY_CAM said:

    I admire your word ussage. flippety. i think i shall go do some
    flippetys now.😎

    but you gotta ask yourself one question, does the dude abide?

    --
    unibikeling

    wickedbob said:

    I tried doing sit ups once, but got tired so I had a poptart.


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  10. SHAY_CAM said:

    The only reason the 137's are more popular is because the people that
    buy those unis also do street. and longish cranks are better for
    crankflips. I want moments 🙂 im ditching those dx cranks soon!

    Wouldn't shorter cranks be better for flipping because they could spin
    easier...

    Although I'm not in much of a position to talk because I still can't
    crankflip:p

    --
    _Ground_Zero_
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  11. _Ground_Zero_ said:

    Wouldn't shorter cranks be better for flipping because they could spin
    easier...

    Although I'm not in much of a position to talk because I still can't
    crankflip:p

    you would think but think of this. the reason trials cranks are long is
    because when your on thick to thin you bumpy you need really good
    leverage, therefore you needing long cranks. sooo when you jump into
    the air and kick the cranks, there spining with velocity... and when
    you try and land on those short little cranks you may just keep on
    going, whereas longer cranks you have the longer leverage to spot them
    from spinning on.

    --
    SHAY_CAM

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  12. unibikeling said:

    but you gotta ask yourself one question, does the dude abide?

    the dude totally abides and i liked a video of yours but i dont
    remember which one all i remember is that staircase and your little
    picture is one of that staircase so yeah, your cool😎 , im
    cool😎 , we are all 😎 cus we ride uni's and only 😎
    people ride unis cus there 😎 . word.

    --
    SHAY_CAM

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  13. I would never want anything longer than 140mm cranks for trials, after
    that it gets hard to ride skinnies because you wobble.

    I would love to have unis go to 32 hole. I don't really see any reason
    for them to stay at 36.

    --
    mornish

    aim:kiloornish
    email: mornish at gmail dot com
    msn: mornish at gmail dot com
    'Miles Land' (http://mornish.blogspot.com/)
    'California Mountain Unicycle Weekend 2008'
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    Matt said:

    Yeah I do, but, I'm lazy you see... it's this disease and uh, I haven't
    taken my medication?


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  14. For years trials bikes were predominantly the 20/19" versions, and ran
    shorter cranks 152-155. Mid nineties Monty went to 158s on its higher
    end mod (20"😉 bikes. Late '90s Megamo (now out of business) introduced
    170s on some models of mod bike. It took a few years, but for the most
    part...now mod bikes use 170s. The reason, more leverage for a bigger
    move.

    Strictly considering trials (freestyle aside), does the same line of
    thinking apply?

    --
    tim williamson

    Enjoy,
    Tim Williamson
    NUMEN 2008
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  15. tim williamson said:

    For years trials bikes were predominantly the 20/19" versions, and ran
    shorter cranks 152-155. Mid nineties Monty went to 158s on its higher
    end mod (20"😉 bikes. Late '90s Megamo (now out of business) introduced
    170s on some models of mod bike. It took a few years, but for the most
    part...now mod bikes use 170s. The reason, more leverage for a bigger
    move.

    Strictly considering trials (freestyle aside), does the same line of
    thinking apply?

    not really, at least in my opinion.

    if all you are doing is hopping, than I would imagine that yes it would
    be good, but a lot of trials is riding skinnies and doing lines that
    require some rolling, and there is where you don't want really long
    cranks.

    If you have strong legs you can get enough leverage out of 137's/
    140's, at least that's what I've found.

    -Miles

    --
    mornish

    aim:kiloornish
    email: mornish at gmail dot com
    msn: mornish at gmail dot com
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    Matt said:

    Yeah I do, but, I'm lazy you see... it's this disease and uh, I haven't
    taken my medication?


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  16. mornish said:

    not really, at least in my opinion.

    if all you are doing is hopping, than I would imagine that yes it would
    be good, but a lot of trials is riding skinnies and doing lines that
    require some rolling, and there is where you don't want really long
    cranks.

    If you have strong legs you can get enough leverage out of 137's/
    140's, at least that's what I've found.

    -Miles

    Thanks Miles,

    So I guess that 145 is really the upper end of things. I was not
    suggesting that UNIs might want 170, just what things are different and
    what is considered the longest useable size. In biketrials, it was
    really the power of the riders increasing over the years that pushed
    the size up. I do understand that on bikes you have gearing to contend
    with (that has gotten steeper over the years....hence the longer
    cranks). So the longer the cranks (further from the spindle), the more
    wobbly things get..... that is something I never thought
    about....interesting.

    Does anyone know how long UNI trials cranks were a few years ago? Or
    have they always been about the same length?

    --
    tim williamson

    Enjoy,
    Tim Williamson
    NUMEN 2008
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  17. tim williamson said:


    Does anyone know how long UNI trials cranks were a few years ago? Or
    have they always been about the same length?

    Years back almost everyone was riding 145mm because profile was the
    only option for splined uni trials cranks and that's the shortest they
    come. When Kris Holm produced his first trials hub/cranks in 2003, they
    were 140mm. Now most trials unis come with 137/140mm cranks, the
    exceptions I can think of are torker (125mm) and qu-ax (145mm).
    I personally like 137/140 for trials and 125 for street/flat.

    --
    Spencer Hochberg

    UniFlatland.com
    BedfordUnicycles.ca
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  18. tim williamson said:

    Thanks Miles,

    So I guess that 145 is really the upper end of things. I was not
    suggesting that UNIs might want 170, just what things are different and
    what is considered the longest useable size. In biketrials, it was
    really the power of the riders increasing over the years that pushed
    the size up. I do understand that on bikes you have gearing to contend
    with (that has gotten steeper over the years....hence the longer
    cranks). So the longer the cranks (further from the spindle), the more
    wobbly things get..... that is something I never thought
    about....interesting.

    Does anyone know how long UNI trials cranks were a few years ago? Or
    have they always been about the same length?

    Well for a long time profiles where the only really strong splined
    cranks you could get for unis, and they came in somewhere between 145 -
    150 mms.

    Lots of people rode them and did amazing things on them, but they have
    always felt pretty long to me. I could probably get used to them, but I
    would rather ride slightly shorter cranks.

    edit: spencer beat me to it.

    --
    mornish

    aim:kiloornish
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    Matt said:

    Yeah I do, but, I'm lazy you see... it's this disease and uh, I haven't
    taken my medication?


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  19. another factor is wheel size. with a mod rim, your cranks can only be
    so long, unless you intend on never turning while riding a unicycle. i
    can't imagine going longer than my 145mm (i think someone found out
    that they were really 150mm) profiles, because on some sharper turns i
    do bump the pedals on the ground. very rarely has the force been
    enough to knock me off my unicycle. it only happens once in a while,
    and not just with turns, but sometimes from riding on steeper
    surfaces.

    as far as spoke options go, i'm no expert, but i would assume that it
    has to do with the unusual forces and strains unicycles put on rims.

    i for one, as a uni trials rider, am very skeptical about drilled rims,
    let alone 32 spoke wheels. i will probably never ride a drilled rim,
    ever! i just don't think those things are strong enough for what
    trials unicycles are put through. someone correct me if i'm wrong.

    --
    TrialsUni
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  20. TrialsUni said:

    another factor is wheel size. with a mod rim, your cranks can only be
    so long, unless you intend on never turning while riding a unicycle. i
    can't imagine going longer than my 145mm (i think someone found out
    that they were really 150mm) profiles, because on some sharper turns i
    do bump the pedals on the ground. very rarely has the force been
    enough to knock me off my unicycle. it only happens once in a while,
    and not just with turns, but sometimes from riding on steeper
    surfaces.

    as far as spoke options go, i'm no expert, but i would assume that it
    has to do with the unusual forces and strains unicycles put on rims.

    i for one, as a uni trials rider, am very skeptical about drilled rims,
    let alone 32 spoke wheels. i will probably never ride a drilled rim,
    ever! i just don't think those things are strong enough for what
    trials unicycles are put through. someone correct me if i'm wrong.

    Another point I had not thought about, in reference to crank length.
    The spindle on a bike is higher than that of a UNI, certainly making a
    difference when it comes to clearance and length..... good point.

    Per the spokes. On a 19" wheel, laced taught with good quality
    spokes.... the difference between 36 and 32 in strength is only
    something that makes difference in the theoretical.

    As for drilled rims. Most of the strength of a wheel is in the tension
    of the spokes. A good wheel build will make even a truely crappy rim
    appear to be strong.

    --
    tim williamson

    Enjoy,
    Tim Williamson
    NUMEN 2008
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