my cranks broke



D

Die-Hard Uni

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just recently, my'Nimbus X Alloy Crank arms'
(http://www.unicycle.com/shopping/shopexd.asp?id=754) broke.
i was wondering if anyone new of some strong, yet somewhat
affordable, new crank arms. I am looking for ones that can
withstand jumping and doing drops.

--
die-hard uni - 24-inch CRUISIN'

"I already gave my best. I have no regrets at all." -William Hung
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I am interested to know what you were doing when they broke,
in what way they broke, and how they were installed on the
uni. Also what length cranks are they?

Do you have any pictures that you could post?

--
U-Turn - Member of Generation XO

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The way that they broke is they got stripped. I was just
riding when I noticed they were stripped, but I think it
happened from too many drops and too much hopping. Doing
drops and hopping is the kind of thing I like doing, which
is why I need stronger cranks.

--
die-hard uni - 24-inch CRUISIN'

"I already gave my best. I have no regrets at all." -William Hung
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unless you invest in something expensive, like kookas, you
shall find that all the other [square tapered] crank arms
will perform similarly. my suggestion is that you make the
investment and buy a splined hub and crank set. i went
through six pairs of crank arms on my muni with suzue hub (i
am riding the nimbus x's now). since i usually ride my onza
trials now, my muni's crank arms have had a much needed
break. unless you would prefer to dish out 35 bucks every
few months for replacement crank arms, get a splined setup.

--
muniracer - Hell On Wheel

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die-hard uni wrote:
> *The way that they broke is they got stripped. *

What part stripped? Did the pedal threads strip (where
the pedal screws in to the crank)? Did it start wobbling
on the hub?

--
john_childs - Guinness Mojo

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die-hard uni wrote:
> *That's exactly what happened, the pedal threads
> stripped. *
Then the hops and drops probably had nothing to do with it;
you probably used too much torque to tighten the pedals.
What kind of wrench did you use?

The use of blue loctite on the pedal threads assures that
the pedals won't unscrew even if you just tighten them until
they are snug. There's not really any need to honk them down
real hard.

uni.com is extremely liberal with their returns policy and
I'm sure they'd replace them for you under warrantee. It
would also be reasonable to assume the liability yourself,
based on the above analysis.

--
U-Turn - Member of Generation XO

Weep in the dojo... laugh on the battlefield.

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If the pedal threads BOTH stripped, one obvious possibility
is that you had the cranks on the wrong sides. I made that
mistake and the pedals unwound and ruined the thread on one
of the cranks.

The threads wind in opposite directions.

I can see no obvious reason why drops would strip the
threads.

--
Mikefule - Roland Hope School of Unicycling

Some days you're the fly; some days you're the windscreen. When you're
the fly, you get to eat sh*t.
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Sounds like either the cranks were on the wrong sides, or
the pedals were just allowed to be loose while you
continued to ride.

Make sure the right-hand threaded crank is on the right side
when you ride, and check your pedals every once in a while
for tightness. Then they should last until the axle breaks!

--
johnfoss - Walkin' on the edge

John Foss, the Uni-Cyclone
"jfoss" at "unicycling.com"
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because they are easy, but because they are hard." -- John F. Kennedy,
1961
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And be very careful when threading the pedals in aluminum
cranks. The aluminum threads are not as strong as steel
threads and they can be stripped if the pedals are threaded
on cross-threaded. Cross-threading is where the threads do
not sync up properly when you start threading on the pedal.
You're threading the pedal on across the grain. It's
amazingly easy to do.

When you start threading the pedals on you need to use your
fingers. Don't use a wrench. By using your fingers you'll
be able to feel when the threads are lined up and your
fingers can't generate enough force to cross-thread. Use
your fingers to get a couple revolutions and then you can
use the wrench.

Again, it's amazingly easy to cross thread a pedal.
Especially with aluminum cranks, but it's also possible with
steel cranks. Be careful.

And the pedal threads should be greased.

--
john_childs - Guinness Mojo

john_childs (at) hotmail (dot) com
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