threaded fork sizing?

I've got a ~2000 Bianchi Campione and I'm wanting to upgrade the fork to
something carbon. There are threaded carbon forks out there, but as I
was talking to an LBS guy, I started to question whether my headset is
1" threaded (as I understand as "standard") or possibly 1 1/8" threaded.
Using an unscientific ruler, I determined that the quill size (standard
Bianchi-branded ITM:
http://store.bianchiusa.com/store/im...tems/E3112.jpg) is less than
1", but that the outside diameter of the fork steerer, as measurered by
eye from above the upper nut of the headset, seems to be 1 1/8". I found
something that says "take the diameter of the quill and add 1/8", but
that just puts me at about 1 1/16! The headset is a Shimano 105, if that
makes a difference. I'm really just looking for some kind of explanation
or clues on what to look at. I'd imagine if 1 1/8" threaded steerers are
rare that that might be good enough to know, or I could just take the
dang bike down to the shop and have them tell me. But in true Usenet
fashion I submit to the great unknown first.

-e

Eric Hill wrote:
I've got a ~2000 Bianchi Campione and I'm wanting to upgrade the fork to
something carbon. There are threaded carbon forks out there, but as I
was talking to an LBS guy, I started to question whether my headset is
1" threaded (as I understand as "standard") or possibly 1 1/8" threaded.
Using an unscientific ruler, I determined that the quill size (standard
Bianchi-branded ITM:
http://store.bianchiusa.com/store/im...tems/E3112.jpg) is less than
1", but that the outside diameter of the fork steerer, as measurered by
eye from above the upper nut of the headset, seems to be 1 1/8". I found
something that says "take the diameter of the quill and add 1/8", but
that just puts me at about 1 1/16! The headset is a Shimano 105, if that
makes a difference. I'm really just looking for some kind of explanation
or clues on what to look at. I'd imagine if 1 1/8" threaded steerers are
rare that that might be good enough to know, or I could just take the
dang bike down to the shop and have them tell me. But in true Usenet
fashion I submit to the great unknown first.

If you measure your quill stem where it enters the headset, it will be
22.2 mm. Use a set of vernier calipers. The outside of the fork
steerer will be 25.4 mm. 3.2 mm difference. Roughly 1/8" (25.4mm per
inch / 8 = 3.175) Threaded 1.125" forks are rare. Especially on road
bicycles. I doubt if Shimano ever made a threaded 1.125" headset.

wrote:
snip I doubt if Shimano ever made a threaded 1.125" headset.

They didn't. The 105 headset is 1".

Dave Thompson wrote:
wrote:
snip I doubt if Shimano ever made a threaded 1.125" headset.

They didn't. The 105 headset is 1".

Perfect, guys. Thanks.

-eric

Eric Hill wrote:
I've got a ~2000 Bianchi Campione and I'm wanting to upgrade the fork to
something carbon. There are threaded carbon forks out there, but as I
was talking to an LBS guy, I started to question whether my headset is
1" threaded (as I understand as "standard") or possibly 1 1/8" threaded.
Using an unscientific ruler, I determined that the quill size (standard
Bianchi-branded ITM:
http://store.bianchiusa.com/store/im...tems/E3112.jpg) is less than
1", but that the outside diameter of the fork steerer, as measurered by
eye from above the upper nut of the headset, seems to be 1 1/8". I found
something that says "take the diameter of the quill and add 1/8", but
that just puts me at about 1 1/16! The headset is a Shimano 105, if that
makes a difference. I'm really just looking for some kind of explanation
or clues on what to look at. I'd imagine if 1 1/8" threaded steerers are
rare that that might be good enough to know, or I could just take the
dang bike down to the shop and have them tell me. But in true Usenet
fashion I submit to the great unknown first.

Unless you love the look of a quill stem, go threadless. You'll need a
new stem and headset, but this seems like the ideal opportunity to
upgrade. Decent quill stems are getting rare - especially if you want a
black one - and one day you'll need to replace yours.

Zog The Undeniable wrote:
Unless you love the look of a quill stem, go threadless. You'll need a
new stem and headset, but this seems like the ideal opportunity to
upgrade. Decent quill stems are getting rare - especially if you want a
black one - and one day you'll need to replace yours.

I've actually read and thought about this a bit and am not convinced
that it's actually qualifies as an upgrade.

-eric

They certainly did

See http://www.sjscycles.com/store/vIndex.htm?cat584.htm for examples.

Andrew Webster

Eric Hill wrote:
Zog The Undeniable wrote:
Unless you love the look of a quill stem, go threadless. You'll need a
new stem and headset, but this seems like the ideal opportunity to
upgrade. Decent quill stems are getting rare - especially if you want a
black one - and one day you'll need to replace yours.

I've actually read and thought about this a bit and am not convinced
that it's actually qualifies as an upgrade.

-eric

All things considered, the same could be said about replacing a good
steel fork with the latest-and-greatest carbon model.

On 16 Jul 2005 16:28:49 -0700, "
wrote:

Eric Hill wrote:

I've actually read and thought about this a bit and am not convinced
that it's actually qualifies as an upgrade.

-eric

All things considered, the same could be said about replacing a good
steel fork with the latest-and-greatest carbon model.

Why? Carbon forks are strong and lighter.

JT


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John Forrest Tomlinson wrote:
On 16 Jul 2005 16:28:49 -0700, "
wrote:


Eric Hill wrote:

I've actually read and thought about this a bit and am not convinced
that it's actually qualifies as an upgrade.

-eric

All things considered, the same could be said about replacing a good
steel fork with the latest-and-greatest carbon model.


Why? Carbon forks are strong and lighter.

Yeah. To be sure, and I don't think I mentioned this in my original
post, my idea here is to shave some weight until I buy a new bike in a
year or so. Now, to track down that Bianchi threaded carbon fork they
made a few years back!

-eric