Originally Posted by
puchfinnland
I think the aluminum frames are bit too stiff for your weight.
have you considered talking to a frame builder about the situation that is going on?
now that you say you broke 2 frames its something to consider.
as for fixing I had another thought.
as you have nothing left to loose in this frame and it is highly likely to happen to your next frame....
find an aluminum welding specialist locally (not hard to find at all)
or ask a frame builder about heavy duty alloy lower tubes, and explain why they are broken
the 2 lower tubes can be completly removed and new ones built in-stronger then before.
send a pm to frank the welder about this
but I love the stiffness! it's the responsiveness of aluminum that I just can't get enough of.
interesting idea.
will do
Originally Posted by
jimmuller
You have broken at least two frames this way?
1. You must be one heckuva powerful masheri.
2. You might want to consider a different frame material.
Originally Posted by
puchfinnland
no offence black bullet...
Aluminum is just a stiff material, and its brittle
you should look into a lightweight cr-mo frame possibly
much more strength and flex.
non taken. I'm a 6'4" 230lb 21 yr old that spends too much time out of the saddle haha
and fwiw the first frame that I broke was Reynolds 520. it broke on the driveside chainstay near the dropout but during similar circumstances.
Originally Posted by
jimmuller
That's what I've been thinking about too. The chainstays and indeed the entire BB are in fact under tension by the rider's weight acting on the rear triangle.
However the chain would be pulling the rear axle forward, and since the chain is on right side that side's tension would see a lower maximum than the left side, and probably lower average tension too. Hence a tension separation is more likely on the left.
No matter how hard the rider cranks on the pedals or pulls upward on the handlebar, the rider's weight on the BB as far as the rear triangle sees it will never exceed his/her downward dynamic load. If the rider is more or less stationary vertically that load will be just the rider's weight. However a rider could bounce up and down dynamically to generate more force on the pedals. The bigger the rider the more dynamic load is possible. (Little 160lb guys like me can't do much in that regard.)
Twisting forces on the BB might also be a factor. One would think the ST and DT would take most of that sort of stress, but perhaps it can alternately compress one chainstay and tension the other.
So one must conclude that TBB pedals with vigor.
Mr. Bullet, a question. Do you recall where in your pedal stoke this failure occurred? That might be a clue.
BB flex would seem to be a likely cause. crank was at 180 degrees with my dominant foot forward and I was out of saddle
Originally Posted by
Chombi
Maybe a Cannondale Al frame might have had a better chance of surviving whatever caused this Nishiki to fail....
Chombi
I don't know why but I've never been too fond of Cannondale's in terms of aesthetics. definitely wouldn't mind getting my hands on another Klein though!
Originally Posted by
ColonelJLloyd
Please do not try and use "science" to understand this unfortunate accident. The Lord does not condone aluminum frames. That is why this happened.
Why don't you tell us how you feel about aluminum frames, Colonel.
I like riding aluminum....I'm a heretic.
Originally Posted by
ColonelJLloyd
They look nice, but I don't ride them because I don't want to burn in hell's fire.
Originally Posted by
Lewis_Moon
The Right Reverend Lloyd has spoken.
hahahahaha