Broken KH frame...again

[agentQ]

**My speculation bellow, feel free to correct me**
This picture shows how all of his weight is on that crank and frame leg and he is trying to hold all that weight up by holding/pulling on the seat. It created enough pressure to slip out of his hand. Thats a lot of pressure on that one weld. Seeing as this a a pretty common flat move, you have to assume that the weld is stressed quite a bit. More so then with big drops which are usually landed on the pedals and cranks with very little weight on the frame. When there is its on the front of the seat (most times) so the seat and seatpost take alot of the stress before the frame. With flatland a lot of the stress is sideways, so there is nothing to take the edge off that stress. Its all goes to that weld at the crown.

Aluminum is pretty weak where its been welded. ... what are ya gonna do?

Originally Posted by SkierAlex

I'm not an expert but it looked like all he did was drop it? It snapped so easily!

I am sure it was cracked before he dropped it, haha.

[saskatchewanian]

Aluminum is plenty strong when it is welded properly BUT is does not take repeated stresses very well. That frame has probably been stressed many many times and the shock from the pedal hitting the ground just finished it off.

This is why I would not buy a used aluminum frame.


If you go frame by frame you can see it breaks when the pedal strikes the ground.

[SkierAlex]

And people keep buying alum KH frames for $200 when steel nimbus are $50?

[agentQ]

I dont think it had anything to do with the pedal hitting the ground, other than thats when the rest of the unicycle stopped and the top broken off seat tube kept going.

Yes aluminum can be strong, when welded properly(which is considered an art). But even good aluminum welders are often times far from that artist status. Even a true artist can not keep aluminum from failing.
There is a reason why Thomson posts are so strong.... anyone? ...No welds.

Originally Posted by SkierAlex

And people keep buying alum KH frames for $200 when steel nimbus are $50?

Aluminum is light, and unicycles are much cooler than money.

[Jerrick]

Originally Posted by SkierAlex

I'm not an expert but it looked like all he did was drop it? It snapped so easily!

It wasnt just that drop that did the everything. It took, what, 6 or 8 months of riding to weaken it at that point, and all that combined is what allowed it to snap from that trick.

Flatland, from the foot, body, and unicycle positions, puts tons of stress onto the frame. Way more than trials, and a bit more than street does.

The KH frame isnt reinforced at that area either. And thats already been covered. I think the best frames would be the Qu-Ax steel or alum frame, the Triton frame, then the Nimbus II frame.

[peleschramm]

Yeah ive snapped mine before too, but just once. I hope you didnt yet buy a new one, because you can get a free replacement. I think a kh frame beats the nimbus any day, though weaker, because it has a warranty.

[kington99]

yeah that must have had a pretty serious crack in it to break at that point. Looks like you qualify for the triton sponge.

[Chrashing]

Originally Posted by agentQ

Quote: Originally Posted by SkierAlex
And people keep buying alum KH frames for $200 when steel nimbus are $50?


Aluminum is light, and unicycles are much cooler than money.

that is profound! (<--- edit: there is a word I never used before.)

[Emile.m]

Originally Posted by agentQ

I am sure it was cracked before he dropped it, haha.

You are absolutly right.

I checked myself, frame by frame in wmp classic and I clrearly see that's has been cracked before the pedal touches the ground.

[pedrotejada]

Wow! That sucks... 2 broken KH frames!

Good Luck with your next frame...

[foforackard]

Jon man im sorry this happened. i admire how you contained yourself when it did break though.

[unibikeling]

Dang, i just got onto a comp that had the ability to watch that vid, and damn.... That sucks... Still once again crazy.

[Jon Atwell]

Originally Posted by foforackard

Jon man im sorry this happened. i admire how you contained yourself when it did break though.

haha i wasnt really mad just in couldnt belive that it would happen the 2nd day of spring break. haha this means uve witnessed both of my frames breaking forrest.

both times when ive broken the frame its been because of sideways stress(the last time it was from 270) so both times ive been pulling on it from the side. Im almost 100 percent there was no crack in it before it snapped

jon A

[peleschramm]

ah i just watched the vid. I love the puzzled look on your face. very comic. (no offense or anything)

Its strange how it seemed to snap so gracefully. that does suck, snapping it on the 2nd day of spring break. I know your pain, I snapped my kh frame on the 3rd day I was in Israel... (out of around 10 days).

[jamessd]

What video?