Don Whitehead
A three tube main triangle is over-rated. Slingshot long ago demonstrated
that the downtube is just cosmetic :)
http://www.slingshotbikes.com/showroom/mountain
2009/3/6 john
> That's what i would do, and then just ride it. Unless that dent is like
> more then say 3/8" to 1/2" deep, i have a hard time believing that it is
> "unsafe" to ride. A top tube, experiences bending and axial compression
> loads and some torsion. If it does "fail" it won't be catastrophic, rather
> you'll notice increased localized buckling at the dent, or maybe a crack
> forming (not as likely since the compression will help keep the crack from
> forming or propagating..).
> The good news is the dent is right there within eyesight, so easy to keep
> an eye on. When you notice something bad happening, then make it yard
> art. I am guessing you will have you own house, yard, and mortgage half
> paid by the time that rolls around, and of course at least another half
> dozen frames, bikes laying around.
> Even if it does break clean through while riding it, the down tube will
> hold together until you stop.
>
> You should post a picture so we all can make "reputable" comments about it.
> :) great end of the week fun.
>
>
>
> 2009/3/6
>
> Ask a disreputable shop if it is safe to ride it.
>>
>>
>>
>> ----- Original Message -----
>> From: "chris robinson"
>> To: obra@list.obra.org
>> Sent: Thursday, March 5, 2009 7:27:48 PM GMT -08:00 US/Canada Pacific
>> Subject: [OBRA Chat] things to do with an old frame?
>>
>> I have an aluminum road bike frame that a reputable shop has deemed unsafe
>> to ride because of a dent in the top tube, so I can't sell it to anyone and
>> I don't just want to throw it out...any ideas?
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>
>
> --
> jms, pe pdx, or
> http://bikeeng.blogspot.com/
>
>
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