Santa Barbara trails claim another frame

So far that's at least two aluminum frames claimed by the SB trails.

--
john_childs

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from the way that snapped it looks like it was either launched from
under the rider and took a huge fall, or when someone was doing a drop
they turned kinda sideways and torked it, cause I mean alluminum doesnt
really bend it just snaps or cracks.

--
brockfisher05

Also a member of the Vancouver unicycle group

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ok thanks! That is a good explanation, i understand it now.

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Pantelis

Been Riding Since June 11th 2006,
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Bought a Torker LX, June 11th!
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:eek: WHOOOW

--
Probailer2

Originally Posted by john_childs
Mmmmm... Sexy welds.
Trials is about controlling where you are and where you want to be.
Kris Holm
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that's insane! what kind of trails are up is SB? I'm in sand diego which
isn't too far away. I want to come on some rides up there!

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mornish

Quoted message said:

<>UNICYCLING FOR MYSLELF TOO<><

"LX seats are as comfortable as bricks." lildude2
"CX seats are bricks."
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that's kind of sad. I always thought of the KH frames as Bombproof. 🙁

--
musketman
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I said a prayer for the trusty steed when I originally saw the broken
frame.😉

Of note, I don't see the seat post going all the way through the fork.
Now, I am not familiar with the KH frame, so I don't know if the seat
post can go down all they way through the fork legs. If it could,
then, I would think that having the seat post go all the way through
the fork legs would strengthen the seat post tube and thus the frame.

Looking at the picture, the seat post doesn't appear to be long enough
to go down all the way. I wonder if that contributed to the breakage.

Hans also "took out" a Lyte Rider fork. That frame allows you to
insert the seatpost tube all the way down through the fork and out the
bottom. So, maybe it doesn't make a difference.😕

I know Hans, he's tall and a strong rider. Maybe it was just brute
force and those frame gobbling trails of the SB.

Dunno

Cheers!

--
teachndad

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teachndad said:

Of note, I don't see the seat post going all the way through the fork.
Now, I am not familiar with the KH frame, so I don't know if the seat
post can go down all they way through the fork legs. If it could,
then, I would think that having the seat post go all the way through
the fork legs would strengthen the seat post tube and thus the frame.

The seatpost cannot go down through the fork legs on the KH frame. I
feel it's a design flaw, not so much because of strength but because it
severely limits the adjustibility of the seat.

--
tholub
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The KH frame does not allow the seatpost to drop through, it's blocked
off by the horizontal frame member. If the post dropped through it
might have taken some of the force, but this would require removing
metal that would make the frame weaker in other ways. I think it's fair
to assume given KH's history of quality products and exstensive testing
that this is the best configuration possible.

It appears the upright broke just above the weld, as is common in metal
failure, a closer inspection of the break surface would indicate the
mode of failure.

Tholub you're right it does limit seat post adjustment, but this could
also be addressed by making the frame stem longer, with no other
obvious disadavantages except a very slight increase in weight.

--
kington99

Dave

- what a thoroughly post-modern subversion of the cycling genre -
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kington99 said:

Tholub you're right it does limit seat post adjustment, but this could
also be addressed by making the frame stem longer, with no other
obvious disadavantages except a very slight increase in weight.

Making the frame stem longer has another disadvantage, in that it
limits how short one can be and still ride the unicycle.

I don't think KH would make the claim that his frames are the best
configuration possible. Among other problems with that claim, you have
to define what it is you're trying to be "best" at.

--
tholub
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tholub said:

Making the frame stem longer has another disadvantage, in that it limits
how short one can be and still ride the unicycle.

I don't think KH would make the claim that his frames are the best
configuration possible. Among other problems with that claim, you have
to define what it is you're trying to be "best" at.

No of course, but if having the post drop right through the frame had a
significant overall advantage, i'm sure he would have done it. I guess
the problem is comprimising for different people's needs, a very tall
and powerful rider might well benefit from a different frame
configuration to the average rider.

--
kington99

Dave

- what a thoroughly post-modern subversion of the cycling genre -
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kington99 said:

No of course, but if having the post drop right through the frame had a
significant overall advantage, i'm sure he would have done it.

Having the post drop through the frame *has* a significant overall
advantage; it gives you at least an extra two inches of adjustibility.
The total safe adjustibility on the KH frame is not much more than an
inch. I adjust my seat more than an inch for different kinds of
riding, let alone different crank lengths or different riders. If I
wanted to configure the thing for easy XC riding, I might ride with a
high seat and 150mm cranks, and then if I wanted to do serious MUni on
it, I would want a low seat and 170mm cranks. That requires some
40-50mm of adjustibility right there, which is probably more than the
current KH design allows.

It probably would not be as strong to have the seat tube pass through,
with the aluminum cross-members welded to the side of the seat tube.
Steel frames get away with it because they're steel. So KH is trading
off flexibility for weight.

--
tholub
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pdc said:

Jagur's prophecy has come to pass.

😎

it took a little longer than i thought it would to see the first
casualty. i bet it wont be very long till the next one pops.

--
jagur

theres enough BS in life, without mobius contributing.
-forget_your_life-
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Steel wins.

--
TheObieOne3226

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I guess the question is, it the weight savings worth the risk of a frame
breakage?

Hundreds (thousands) of KH unicycles with aluminum frames have been
sold...and how many have broken?

Has a steel KH frame ever broken?

TheObieOne3226 said:

Steel wins.

--
mscalisi
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mscalisi said:

Has a steel KH frame ever broken?

Yeah, not even after falling off a Honda Element at freeway speed and
bouncing "joyously" down the freeway shoulder...😉 😄

--
teachndad

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LOL! Yep, they ARE durable. (The seat didn't fare too well)

teachndad said:

Yeah, not even after falling off a Honda Element at freeway speed and
bouncing "joyously" down the freeway shoulder...😉 😄

--
mscalisi
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Since Hans has a long history of snapping Aluminum frames, I think it's
all about how long his seat post has to be to ride. It would seem like
the longer the seat post, the more leverage you're putting on that weld
when it binds during a drop. Like folding the paper clip back and forth
till failure. Anyone else running a seatpost as long as Hans when doing
drops?

-matt

--
myocardial

Matt Wilhelm
Illustrated One Wheeler
Santa Barbara Unicycle Club
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<http://www.sbuni.org>
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myocardial said:

Since Hans has a long history of snapping Aluminum frames, I think it's
all about how long his seat post has to be to ride. It would seem like
the longer the seat post, the more leverage you're putting on that weld
when it binds during a drop. Like folding the paper clip back and forth
till failure. Anyone else running a seatpost as long as Hans when doing
drops?

-matt

That's a very cogent point! I hadn't thought of that.😄 (and I'm
getting a new KH freeride in about a week, so I hope I/it doesn't
suffer the same misfortune!) How much does hans weigh, and would that
be a factor? Can it be re-welded and if so, and if done properly, would
it be just as strong as the original, or would there now be a kind of
permanent "metal fatigue?"

--
terrybigwheel

Impotence: Nature's Way Of Saying "No Hard Feelings".

Uni is just a cycle I'm going through. 😎

You -can- "Tune a fish". You simply adjust their "scales"! 😄
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