Correct Way to Measure Extension on Technomic Deluxe

[Shaun Meehan]

I'm trying to determine the extension length on the Nitto Technomic
Deluxe that I removed from my Atlantis. I was of the understanding
that it's a 12cm extension but the lugged stem that I got to replace
it looks slightly longer and it's a 12cm. Do you measure from the
center of the quill to the center of the handlebar clamp along the
extension? Or? Thanks!

Shaun Meehan

[Seth Vidal]

I've always done center of quill to center of handlebar clamp. And
then I stopped doing that as it never seems to make a difference what
I do but I'm always wrong. :)

sad but true :)

-sv

[William]

They say the Nitto Pearl runs longer than the stated extension. My 11
they say is more like a 113mm or something. It's strange since the
Pearl they go out of their way to engrave "Pearl 11" on the side.

Since you have both stems on hand, you should be able to fit them both
side by side on a handlebar, line up the quill parts parallel and
settle it once and for all.

On Dec 6, 9:44 am, Seth Vidal <skvi...@gmail.com> wrote:

[Shaun Meehan]

On Mon, Dec 6, 2010 at 11:49 AM, William <tape...@gmail.com> wrote:
>
> Since you have both stems on hand, you should be able to fit them both
> side by side on a handlebar, line up the quill parts parallel and
> settle it once and for all.
>

______________________________________________________________

I can, of course, measure the two and determine the difference. The
problem is I'm not certain what the specified extension on the Techno
Deluxe is. I trust that the lugged stem is a 12cm because I just
bought it from RBW and it was labeled as such. I bought the Techno
Deluxe when I bought my Atlantis frame and IIRC, I ordered a 12cm.
When I hold them side-by-side the lugged stem looks a little longer.
I'd like to verify that the TD is indeed a 12cm because I'd like to
sell it and I don't want to sell someone a 11cm stem that I've
advertised as a 12cm. I looked and I didn't see the extension length
stamped on the stem.

Shaun Meehan

[William]

Well then all you want to do is determine the right name of your
TechDLX, so you can sell it correctly. Right?

The bike I have in the cubicle now has an 11cm TechDLX and it measures
a true 110mm, center to center, laying my metric ruler flat along the
top line of the stem. My Nitto Pearl, which is also called an 11,
measures more like 113mm by the same method. Perhaps your lugged
Nitto runs long like the Pearl and is really 123mm or so?

So I think what you are doing is deciding if you should sell your
TechDLX as a 12 or an 11. My 11 really measures 11. There is no way
I could convince myself that this TechDLX is either a 10 or a 12.
It's definitely an 11.

It sounds to me that your TechDLX is most likely a 12 and you are
finding that the lugged 12 runs a touch longer than the TechDLX 12.
Is that possible?

On Dec 6, 10:02 am, Shaun Meehan <meehan.sh...@gmail.com> wrote:

[Peter Pesce]

You could, of course, just list the actual measurement and let the
buyer decide if that's what they want or not.
You wouldn't be mis-representing anything.

On Dec 6, 1:02 pm, Shaun Meehan <meehan.sh...@gmail.com> wrote:

[Shaun Meehan]

On Mon, Dec 6, 2010 at 12:23 PM, William <tape...@gmail.com> wrote:

> Well then all you want to do is determine the right name of your
> TechDLX, so you can sell it correctly.  Right?
>
> The bike I have in the cubicle now has an 11cm TechDLX and it measures
> a true 110mm, center to center, laying my metric ruler flat along the
> top line of the stem.  My Nitto Pearl, which is also called an 11,
> measures more like 113mm by the same method.  Perhaps your lugged
> Nitto runs long like the Pearl and is really 123mm or so?
>
> So I think what you are doing is deciding if you should sell your
> TechDLX as a 12 or an 11.  My 11 really measures 11.  There is no way
> I could convince myself that this TechDLX is either a 10 or a 12.
> It's definitely an 11.
>
> It sounds to me that your TechDLX is most likely a 12 and you are
> finding that the lugged 12 runs a touch longer than the TechDLX 12.
> Is that possible?

Yes. Correct. I'm trying to determine the correct extension (as
specified by Nitto/RBW) for my TechDLX. Thanks for your help William.
I'll measure my TechDLX in the manner you described when I get home
and see what I come up with. It is quite possible that they're both
12cm and the lugged stems run a little longer. But it's also possible
that I've got an 11cm TechDLX and I'm erroneously remembering it as a
12cm.

Shaun Meehan

[Michael_S]

I've been told that the Nitto Pearls are 7 mm longer than their stated
size by sources who quote Nitto. I have tried to measure that on the 9
and 10 that I own and could say that is true to the best of my ruler/
eyeball measuring skills. I also belive that variation of 2-4 mm in a
bike stem is entirely reasonalble (which is about 3% of the total
extension length).

I also have a 110mm Nitto lugged model and it measures 110mm with my
aforementioned ruler/eyeball method.

~Mike~

> > Shaun Meehan- Hide quoted text -
>
> - Show quoted text -

[mr.trout]

nitto measures their stems from center of the quill to center of the
clamp, through the extension extension. meaning not the top of the
stem, but from the center of the quill the actual center of the clamp
itself, or the circular part the bars go in. according to pythagoras
it should be shorter than measuring on the top. measure it that way
and it should be accurate.

[Ken Freeman]

I used to measure like that (along the AXIS of the extension, not the top), but then I got a NIB Pearl.  There is a picture on the box showing measuring from the center of the handlebar clamp to the center of the quill, on a line perpendicular to the quill, not along the extension.  Doing so reproduced the 12 cm extension of the claimed 12 cm exactly.

I don't know how to compare this number to measures of other stems, because I don't know how they are intended to be measured.  You can use trigonometry to convert this number to any other measure, but if you're looking at an Ebay (or iBob!) part, you don't know how it was measured.

For example, how did Cinelli intend its stems to be measured, and do all those sellers know that? 

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Ken Freeman
Ann Arbor, MI USA

[Ken Freeman]

If you're looking at the perpendicular measurement (the base of a 17 degree right triangle) versus along the center of the extension (the hypotenuse of the triangle), the difference is 1/cos(17) which is 1.046 times the perpendicular measurement.  For the 12 cm stem this works out to 5.5 millimeters.  The difference is smaller for smaller stem extensions. 

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[Ken Freeman]

I think it's very possible that RBW doesn't quote extensions as measured by Nitto, and it's possible that Nitto doesn't measure all its stems the same way.  I think the former explanation is more likely.

Shaun Meehan

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