Fractured Frame

[tbeeghly]

It's been a while since I've posted, the bike has been running fine for a long time. After about 9 months of riding, and 2 weeks of solid daily riding since school started, the frame finally couldn't take it. It snapped today on my way home from class. Was the frame just too weak? I want to get a cruiser frame for my next build, I think those are much heavier, sturdier. I also want to do a springer fork with much bigger tires, the 1 3/8 provided no support at 35mph. Any ideas?

Taylor

 

[s_beaudry]

Could be a weak frame....

But seeing that it cracked right where the motor mount is, my guess would be that the motor vibrated or stressed the frame too much where it was mounted.

Hope you may it home ok when that happened, safety first!

 

[GoblinAero]

Cracked tube

Wow, that's amazing.

'Seems like the frame was made with steel rather than chromoloy. Is that true? I've never seen chromoly do that.

Jeff

 

[Mountainman]

But seeing that it cracked right where the motor mount is, my guess would be that the motor vibrated or stressed the frame too much where it was mounted.

sure is what it looks like

for these frame mounts -- something should be wrapped around the
frame so as to protect --
anything wearing too much will have a cutting effect
especially with the high vibration

makes it hard when we wish to --
Ride That Thing Mountainman

 

[SirJakesus]

This has happened to somebody's chromoly down tube as well. It happened to admin tom's seat tube as well as several other bikes having the same failures at the motor mounts. Always with "Happytime" 2 strokes.
Between this and their tendency to lock up the rear wheel and cause a quarter mile skid, possible wipeout, mangled spokes etc. I really wonder why people trust their lives to these things anymore.

 

[Accender]

Wow, that's amazing.

'Seems like the frame was made with steel rather than chromoloy. Is that true? I've never seen chromoly do that.

Jeff

I have never seen steel do that. steel is a mainstay, forgive weight.

chromoly is to thin (by design) in my book.


A

 

[Donald M. Haney]

Was there any sign of trouble during your normal 'pre-flight' inspections? I fear this happens from the inside out. You'll never see it coming. Failure of the down tube on a cantalever frame, such as on a cruiser, while you're underway, you're probably going 'a$$ over tea-kettle'. Another reason to keep the speed down on these things. Rear wheel lock-up, or frame break at 15mph is bad. At 40mph... R.I.P.

 

[Accender]

/

I just looked at that picture.
Was the section cut out with a saw?

A

 

[TwoWalks]

"Happytime" 2 strokes. Between this and their tendency to lock up the rear wheel and cause a quarter mile skid, possible wipeout, mangled spokes etc. I really wonder why people trust their lives to these things anymore.

Because they are inexpensive and fun?

 

[hill climber]

i think maybe some folks are not mounting these ht engines properly. they need to be completly seated on both mounts. the mount should set flush on the frame as to not make a chisel edge on the frame. also,with the mounts not setting properly you are trying to bend the frame tube at the mount when tightening the bolts. what do you guys think?