Re: off center rims (hype or helpful)?

On 24 Nov, 22:40, "dustoyev...@xxxxxxx" <dustoyev...@xxxxxxx> wrote:
On Nov 24, 12:47 pm, thirty-six <thirty-...@xxxxxxxxxx> wrote:



On 24 Nov, 18:08, "dustoyev...@xxxxxxx" <dustoyev...@xxxxxxx> wrote:

On Nov 24, 11:20 am, thirty-six <thirty-...@xxxxxxxxxx> wrote:

On 24 Nov, 13:31, "dustoyev...@xxxxxxx" <dustoyev...@xxxxxxx> wrote:

On Nov 23, 8:06 pm, thirty-six <thirty-...@xxxxxxxxxx> wrote:

Hoogywotsits dont' help wheelbuilding.

Never tried one of those.

IRT to tensionometers, if that's the "H-s" reference, didn't you just
bring up "over-tensioned"?

Maybe that was someone else...
--D-y

If you build with appropriate components without bows in the spokes
and to a good wheel response, the spokes will not be so tight as to
cause pull through or fatigue.

I was thinking of published info from manufacturers IRT tension
measured with a tensionometer. Which is comparing apples to apples,
when you measure tension with a calibrated instrument, with the same
method ("systematic procedure"). "Not perfect", but the best you can
do.

Sorry, 36, my dad started out as a toolmaker's apprentice, and had a
long career that included supervising the manufacture of millions and
millions of "screw fasteners". He had professional, fraternal respect
for able mechanics and machine operators. And he bought me a torque
wrench to work on my bike with-- because, as he explained, in spite of
materials differences, manufacturing tolerances, lubrication, which
way the wind is coming from or what you had for lunch, "that's the
best you can do". IOW, it's best to use your experience *and* a
measuring tool in this imperfect world.
--D-y

The appropriate method also tests the rim and is relevant to load
carried. This is attained using a test load and either checking the
length of the arc which is pushed inward, by the number of spokes
exhibiting reduced tension,  or checking for rim displacement at the
wheel's base, which could be with a depth gauge or the point at which
a spoke becomes loose.  This is not a diificult system to set up, it's
benefits are that wheel response can be compared between different
component choices and adjusted appropriately for  different load
requirements.

I feel like someone just tried to baffle me with bullshit. First, a
pretty simple, straightforward measurement tool is derided, then an
elaborate test rig that measures (I think) three different parameters
is postulated.

A set single test load may be used and the spokes adjusted so this
load makes one loose. The load may be applied using a lever, fulcrum
and the most complicated bit of kit, the wheelbuilders mass. If
you've a solid building and truing jig this is easily done. Otherwise
you need to fabrcate something up. I used a steel strap hooked under
the tail stock of a bench vice and used the vice jaws as the fulcrum.
If I'm building more than a pair of rims, I get a feel for them and
can judge pretty well without necessarily resorting to static
testing. If I have time, I usually put the wheels on one of my own
bikes and do a dynamic test. If the rider is significantly lighter
than me, I will knock off up to 1/2 turn from my ideal setting as
tested over cobbles. The dynamic testing and adjusting can take a
little time if I decide I like the wheels.



Nothing like measuring for yourself, of course, but we have a couple
of shop owners here sharing experience via recommendations that name
certain rims as being suitable for a given use.

Following, a pro buildup with measured tension, per manufacturer specs
(tempered by "field results", as I understand Mavic's recommended
specs might be a little high <g>) would seem to be a straightforward
program. --D-y

If you use exactly the same build detail and the rim carience is
within about 4%

.

Relevant Pages

  • Re: off center rims (hype or helpful)?
    ... and to a good wheel response, the spokes will not be so tight as to ... when you measure tension with a calibrated instrument, ... Nothing like measuring for yourself, of course, but we have a couple ...
    (rec.bicycles.tech)
  • Re: off center rims (hype or helpful)?
    ... spokes and to a good wheel response, the spokes will not be so ... I was thinking of published info from manufacturers IRT tension ... The appropriate method also tests the rim and is relevant to load ... Nothing like measuring for yourself, of course, but we have a couple ...
    (rec.bicycles.tech)
  • Re: off center rims (hype or helpful)?
    ... and to a good wheel response, the spokes will not be so tight as to ... I was thinking of published info from manufacturers IRT tension ... The appropriate method also tests the rim and is relevant to load ...
    (rec.bicycles.tech)
  • Re: off center rims (hype or helpful)?
    ... spokes and to a good wheel response, the spokes will not be so ... I was thinking of published info from manufacturers IRT tension ... The appropriate method also tests the rim and is relevant to load ... Nothing like measuring for yourself, of course, but we have a couple ...
    (rec.bicycles.tech)
  • Re: off center rims (hype or helpful)?
    ... spokes and to a good wheel response, the spokes will not be so ... apples, when you measure tension with a calibrated instrument, ... to use your experience *and* a measuring tool in this imperfect ... it's benefits are that wheel response ...
    (rec.bicycles.tech)