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From: Jeff Liebermann <jeffl@cruzio.com>
Newsgroups: rec.bicycles.tech
Subject: Re: Machine Shop
Date: Sat, 22 Feb 2025 13:06:13 -0800
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On Sat, 22 Feb 2025 19:58:29 GMT, cyclintom <cyclintom@yahoo.com>
wrote:

>On Fri Nov 8 14:03:46 2024 Frank Krygowski  wrote:
>> It doesn't exist, Tom. You can't pop a dent out a bicycle frame tube by 
>> riding the bike. Thinking you can is a sign of insanity.
>
>If you have a slight dent in high performance steel. the tubing can revert to its natural shape under stress.

Tom.  The only steel that might do that is spring steel (1095, 1060,
1075, 1080, etc).  Bicycle frames are not made from spring steel.  If
they were made from spring steel, they would ride like the proverbial
wet noodle.  

So, what's the SAE/AISI number for such a spring steel bicycle frame
and who is selling such bicycles?
<https://www.azom.com/article.aspx?ArticleID=6151>
Since you claim that you fixed the dent on YOUR bicycle, could I
trouble you for the maker and model number of this bicycle so I can
determine steel alloy that was used?  Some photos of the dent, before
and after, would also be nice.

Note that I'm not talking about shape memory metal alloys:
<https://en.wikipedia.org/wiki/Shape-memory_alloy>

I'm also not talking about hydroforming, which doesn't work at
removing dents in steel tubing without high pressure hydraulic
assistance.  It's commonly used for bending aluminum frames.  You
obviously don't have the necessary equipment in your garage workshop
because you claimed that the dent popped out after simply riding the
bicycle:
<https://www.bikeforums.net/bicycle-mechanics/919494-ding-removal.html>

>Where the hell do you get off not knowing the properties of tempered steel and commenting on it?

Frank, he's all yours now.


-- 
Jeff Liebermann                 jeffl@cruzio.com
PO Box 272      http://www.LearnByDestroying.com
Ben Lomond CA 95005-0272
Skype: JeffLiebermann      AE6KS    831-336-2558