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From: AMuzi <am@yellowjersey.org>
Newsgroups: rec.bicycles.tech
Subject: Re: tech: physics and materials
Date: Wed, 21 Aug 2024 10:05:43 -0500
Organization: Yellow Jersey, Ltd.
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On 8/21/2024 9:07 AM, John B. wrote:
> On Wed, 21 Aug 2024 07:55:51 -0500, AMuzi <am@yellowjersey.org> wrote:
> 
>> Our customer wants higher handlebars.  We sold him a new
>> bike and as usual I asked for dimensions from post to
>> handlebar on centers and handlebar to ground from his old
>> bike. That's a tall riding position:
>>
>> http://www.yellowjersey.org/daily.html
>>
>> Since the new model has a carbon steerer, I swapped in an
>> aluminum column carbon blade fork of same dimensions.
>>
>> I reasoned that modern aluminum bars are farther from the
>> stem clamp (stress riser) to the bottom, where climbers pull
>> forcefully, than from the top bearing to the stem.
>> Handlebars are thinner than columns with cold formed curves
>> of various radii while columns are a simple cylinder.
>> Failures in handlebars are rare now (usually precipitated by
>> crash damage, corrosion or both) as are threadless column
>> failures (I have never seen one) so I can't reasonably
>> assess frequency. This was intuitive not calculated.
>>
>> The new wrinkle is that after 50 miles he says another 50mm
>> would be better. Yikes! That's a lot, and the local shop
>> refused to add an extender:
>>
>> https://www.yellowjersey.org/UPSTEM.JPG
>>
>> They also refused to run longer gear cables and brake line
>> if he installed the extender himself.
>>
>> I was OK with the bike as delivered but I'm not so sure
>> about more height. Comments?
> 
> If I was in business and a similar question came up I believe I would
> contact the manufacturer or U.S. Distributor.

I did, naturally.
Carbon steerers warn about maximum stem height over top 
bearing (and reasonably so IMHO) but there aren't firm 
limits for metal columns.
-- 
Andrew Muzi
am@yellowjersey.org
Open every day since 1 April, 1971