Quill to a-head conversion - technical q's

On 22/4/05 8:58 am, in article [email hidden],

Jeremy Collins said:

Hi all,

As part of an ongoing project, I have a bike that needs a new stem.
Right now it's got a slightly corroded quill stem, and I'd like to
fit one of these quill to a-head converter stems:

http://tinyurl.com/7qrem

I'm confused over the measurement - the bike has a 1 1/8" headset,
and the existing stem is marked Ø 25.4 - does this mean I need the
1" or the 1 1/8" model?

Neither, see below.

Quoted message said:

Also, once this is fitted, can I then use any, er, stem with it?
It won't need a rugged MTB stem, so will something like these
cheap road stems work?

http://tinyurl.com/74y6e

http://tinyurl.com/9pzrh

I have done exactly that with my road bike. There are two dimensions to
worry about. The first is the quill dimension which will be the internal
diameter of the fork steerer tube. FOr a 1" tube, this is 22.2 mm

The second is the outside diameter of the adapter as you will need the right
stem size. IIRC the THE stem comes with a shim so getting the wrong size
will not be a problem there.

Neither of the two adapters you show in the first URL will fit a 1 1/8
headset. They are for a 1". The difference is in the OD teh stem clamps to.

I use one of the THE stems on my road bike with an adapter but I have a 1"
steerer tube. Wiggle didn't have the converters in stock so I got mine
elsewhere.

...d

Jeremy Collins <[email hidden]> wrote:

: I'm confused over the measurement - the bike has a 1 1/8" headset,
: and the existing stem is marked Ø 25.4 - does this mean I need the
: 1" or the 1 1/8" model?

Confusingly, that 25.4 is the handlebar width, not the fork size.

Arthur

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David Martin said:

Neither of the two adapters you show in the first URL will fit a 1 1/8
headset. They are for a 1". The difference is in the OD teh stem clamps to.

Darn. I can't find any other "converter" stems, so I guess my only
option is to get another old-school quill stem, like these

http://sjscycles.com/store/vIndex.htm?cat579.htm

As the riding position is currently a bit too upright, I want a
"flatter" stem profile, so I guess my only option is the
"Amoeba MTB stem (bridge beam) quill" near the bottom of that
page (i.e the only one with less than 0° of rise).

Thanks for the help,

--
jc

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Jeremy Collins said:

David Martin said:

Neither of the two adapters you show in the first URL will fit a 1 1/8
headset. They are for a 1". The difference is in the OD teh stem
clamps to.

Darn. I can't find any other "converter" stems, so I guess my only
option is to get another old-school quill stem, like these

You can get shims to fit a 1" quill in a 1 1/8 steerer. I would try
someone like Ison for one. If not I think I have one lying around at
home. http://www.ison-distribution.com/ison/all/default.php

Tony

Tony Raven said:

You can get shims to fit a 1" quill in a 1 1/8 steerer.

Ah, that's interesting. I've just looked at Wiggle again and seen this:

http://tinyurl.com/8rmhm

(it says it's a shim to convert 1" quill stems to 1 1/8"😉

So maybe I'm back in business...

Cheers,

--
jc

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Jeremy Collins said:

Ah, that's interesting. I've just looked at Wiggle again and
seen this:

Quoted message said:

http://tinyurl.com/8rmhm

Quoted message said:

(it says it's a shim to convert 1" quill stems to 1 1/8"😉

So maybe I'm back in business...

Selcof Stem Adaptor 1 1/8 to 1 1/8" AHead

http://www.wiggle.co.uk/Default.aspx?Main=ProductDetail.aspx&W=0&Manufacturer=&UberCatName=&Cat=cycle&CategoryName=Stems&ProdID=5300005699&UberCat=0

http://tinyurl.com/b5eoa

James Thomson

Jeremy Collins said:

Also, once this is fitted, can I then use any, er, stem with
it? It won't need a rugged MTB stem, so will something
like these cheap road stems work?

Most flat bars have a diameter at the clamp of 1" (25.4mm) while most road
bars are 25.8 or 26.0mm. It's best to match the clamp diameter of the stem
to that of the bar, though a front-opening stem will generally work well
enough even if mismatched. There are plenty of inexpensive MTB stems on the
market.

Quoted message said:

Finally, if the head tube angle is 70°, then a stem with
about the same angle will give me a "flat" stem, right?

Right, though it's more likely to be sold as 20° - simply use it
upside-down.

James Thomson

Jeremy Collins said:

Hi all,

As part of an ongoing project, I have a bike that needs a new stem.
Right now it's got a slightly corroded quill stem, and I'd like to
fit one of these quill to a-head converter stems:

Thanks to everyone who helped me out on this one, I managed to
get the bits I wanted, and it has worked *perfectly*.

Cheers,

--
jc