On Fri, 24 Mar 2006 22:16:14 -0600, Tim McNamara <
[email protected]> wrote:
>In article <[email protected]>,
> RonSonic <[email protected]> wrote:
>
>> On Fri, 24 Mar 2006 11:06:34 -0600, Tim McNamara
>> <[email protected]> wrote:
>>
>> >In article <[email protected]>,
>> > RonSonic <[email protected]> wrote:
>> >
>> >> I am just astonished at this rigorous adherence to dogma. Listen
>> >> and feel. Use your freeking senses. Your lack of a theory to
>> >> explain it does NOT invalidate observation.
>> >
>> >Problem is, Ron, that this has been discussed for like 100 years.
>> >The double-diamond bicycle frame is a vertically rigid structure
>> >geometrically, and frame material has little if anything to do with
>> >the road vibrations you feel while riding.
>>
>> I am not insisting that frame materials are significant. I am
>> insisting that design and construction as applied to the material
>> selected are significant and that there are meaningful differences
>> between frames.
>
>Erm, Ron, yes there are some differences between frames, as I have
>already said. Front and rear center make a difference, for example. A
>bike with 44 cm chainstays will feel very different than a bike with 38
>cm chainstays. Other than that, the contribution by materials etc is
>minimal if anything.
That, I won't argue with, but there are a number of superficially similar frames
that clearly feel different. Compare an old Klein to an a contemporary
Cannondale. It ain't just the material.
>There are more flexible elements in the system, and the effects of those
>elements will predominate. Tires, saddles, bars and stems are some
>examples.
>
>> >The possible exception to this, as far as I can tell, is composites
>> >such as carbon fiber and wood, because those have a very different
>> >structure than metals and thus might conceivably transmit high
>> >frequency vibrations differently. Whether that would be sufficient
>> >to make a measurable difference in the useful range, I don't know.
>> >
>> >The comfort issue in road bicycles is high amplitude low frequency
>> >vibration, such as from cobblestones, coarse chip seal and pavement
>> >seams. Low amplitude high frequency vibration- the kind most likely
>> >to be damped by a frame material- is not important in terms of
>> >comfort. It's just a buzzy feeling in the bars and saddle.
>>
>> "A buzzy feeling in the bars and saddle" is not important in terms of
>> comfort? You have apparently defined "comfort" so narrowly as to make
>> the rest of your theorizing necessarily true.
>
>Road buzz is just road buzz. Why make a big deal out of it?
Because it's annoying and it IS something that can be damped.
>> Unfortunately, it isn't that simple. Buzzing sensations in the bars
>> and saddle are very uncomfortable and the rest of us do not feel
>> obliged to pretend that we aren't annoyed by them to preserve our
>> theories intact.
>
>"The rest of us?" Whozzat then?
>
>> Where is the line either in frequency or amplitude between benign
>> buzzing and uncomfortable chattering or whatever you'd like to call
>> it?
>
>When it's annoying, naturally. Lots of the roads around here are chip
>sealed and I don't find it bothersome despite resulting in a buzzy feel
>in the bars and saddle. Of course, I choose bikes with long chainstays
>and fairly long front centers, and with 28 to 35 mm wide tires.
>
>I can only presume that you do no off-road riding whatsoever or do it on
>a full suspension bike.
Nope, except for training when cyclocross season approaches almost all my riding
is off-road on a hardtail on Florida's root-covered, pig-damaged, cypress-knee-
surrounded single-track. Oh, with a Girvin fork on a GT frame. Rigidity's a good
thing, right?

I only get in about 6-7 hours of riding a week most of the
year, but it is fun.
Maybe there is a relationship between my prefering trails to roads and my
dislike of road buzz. But it sure doesn't seem to relate to what you're
thinking. As far as I'm concerned the jarring of taking a HT through palmetto
root is a part of the game. The road buzz on the other hand is avoidable through
proper design and construction. My GT is not a good example of this, but has
other attributes and is not called on to do more than a mile of pavement at a
time.
>> >Your subjective impressions are not data ("data" not being the
>> >plural of "anecdote"). There is no lack of a theory to explain- the
>> >theory is that your subjective impressions are in error. There are
>> >so many confounds that would have to be eliminated in order to prove
>> >your observations accurate. Some of those confounds are
>> >psychological (expectation, bias, etc) and some are mechanical.
>>
>> I find buzzing uncomfortable. Perhaps you are prepared to suffer it
>> silently so you won't have to admit that some frames are more
>> comfortable than others.
>
>No, I don't suffer from road buzz. It's a normal part of riding and
>doesn't bug me. If it did I'd consider a Moulton NS.
It doesn't take anything that extreme to minimize it.
Ron