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Old 11-05-2011, 09:40 AM
diceman2004's Avatar
diceman2004 diceman2004 is offline
Motorized Bicycle Elite Member
Join Date: Aug 2009
Location: Kitchener , Ontario
Posts: 568
Default Broken Frame ? Poll..Survey

Just out of interest , I was curious as to where and why peoples frames have been breaking .
If you have the time ... please describe your frame brake here .
It may turn out to be usefull info for us all .

Be exact as to the location of the break ( don.t just say ... the down tube ) .
Did it break an inch away from the neck ? an inch above or bellow the front mount ?
on a weld where the ... and the ... join ?
the exact location .

And then your thoughts as to why it broke .
engine vibration fatigue ? sudden shock ( like going over a big jump ) ?
constant riding down rough roads ? loose wheel , part fell off ? crash ?
Poor engine mounts or mounting ? I drilled a hole neer there ?

What kind of frame , and the type of material its made of .
Steel , Aluminum , Chromolly ?
Brand ? The store i got it from ? Old ... New ? Rusted out fixer-upper ?

Last edited by diceman2004; 11-05-2011 at 09:42 AM.
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Old 11-05-2011, 09:53 AM
Al.Fisherman's Avatar
Al.Fisherman Al.Fisherman is offline
Motorized Bicycle Elite Member
Join Date: Sep 2009
Location: Calera, Alabama
Posts: 1,966
Default Re: Broken Frame ? Poll..Survey

Enlarged hole where water bottle attaches to tube. Photobucket down, will attach picture later

OK here is a picture. The tube was cracked all the way through, as you can see a check separating the tube.

This is one of the bikes I had stored in my garage for the past 10 years. The frame is made out of steel (thin at that).
Looking for HT's parts?
HT pre instillation tips.
Engine running problems?
HT breakdown Photos

Ron ><)))))*> Calera, Alabama

Last edited by Al.Fisherman; 11-05-2011 at 12:57 PM.
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Old 11-05-2011, 10:48 AM
bairdco's Avatar
bairdco bairdco is offline
a guy who makes cool bikes
Join Date: Aug 2009
Location: living the dream in southern california
Posts: 6,258
Default Re: Broken Frame ? Poll..Survey

my first build was on a 1960's Rollfast frame i picked up for 40 bucks. it had two top tubes, using 1/2" tubing, and brazed to the headtube.

both tubes cracked right behind the brazing.

it was a crappy frame to begin with, but like i said, it was my first build, and i wasn't sure if this whole "motorized bike thing" was gonna be any fun.

3 years later and 10 or so builds, i'm hooked, with no more broken frames.

mostly, i've built bikes from the '40s, when quality meant something, and the bikes were built to last. all of them are still going strong.
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