Well, materials science WAS my major, and Jan is right on the bean in my 
opinion.  I have some bike experience to back it up as well, as my pre-riv 
bike was a fillet-brazed Schwinn that I bought new in 1971, and still have 
today.  No difference in the ride that i can see.  The one way a frame 
COULD get flexier, is if you get a fatigue crack growing in a highly 
stressed joint, that will increase compliance and ultimately fail 
completely.  So, if you ever do seem to think your bike isn't as stiff as 
you remember, better do a thorough check of the frame.

The issue with leaf springs is that they operate very close to (and 
sometimes a bit past) the yield strength of the material, and over time and 
a few potholes you can permanently deform them.  Steel bicycle frames don't 
operate anywhere near yield.

Jim in Boulder

On Thursday, March 15, 2012 11:25:53 AM UTC-6, William wrote:
>
> OK, that's not a direct quote.  He didn't say that specifically, but in 
> today's blog post, Jan *does* debunk the notion that steel frames "go 
> soft" with use.  They don't.  You can't break in a steel bike and make it 
> get more flexible for comfort and planing, and you can't wear out a steel 
> frame in terms of stiffness.  It doesn't get flexier with use.  You might 
> break it with use, but you won't make it flexier.  Good read and 
> uncontroversial for many of us, but definitely counter to the popular 
> notion in the cycling community in general.
>
> http://janheine.wordpress.com/2012/03/15/frames-going-soft/ 
>
>
>

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